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Impact of maternal mild hyperglycemia on maternal care and offspring development and behavior of Wistar rats

Inhasz Kiss, Ana Carolina; Woodside, Barbara; Felicio, Luciano Freitas; Anselmo-Franci, Janete; Damasceno, Debora Cristina
Fonte: PERGAMON-ELSEVIER SCIENCE LTD; OXFORD Publicador: PERGAMON-ELSEVIER SCIENCE LTD; OXFORD
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
55.95%
The aim of the present study was to evaluate the effect of maternal mild hyperglycemia on maternal behavior, as well as the development, behavior, reproductive function, and glucose tolerance of the offspring. At birth, litters were assigned either to Control (subcutaneous (sc)-citrate buffer) or STZ groups (streptozotocin (STZ)-100 mg/kg-sc.). On PND 90 both STZ-treated and Control female rats were mated. Glucose tolerance tests (GTT) and insulin tolerance tests (ITT) were performed during pregnancy. Pregnancy duration, litter size and sex ratio were assessed. Newborns were classified according to birth weight as small (SPA), adequate (APA), or large for pregnancy age (LPA). Maternal behavior was analyzed on PND 5 and 10. Offspring body weight, length, and anogenital distance were measured and general activity was assessed in the open field. Sexual behavior was tested in both male and female offspring. Levels of reproductive hormones and estrous cycle duration were evaluated in female offspring. Female offspring were mated and both a GTT and ITT performed during pregnancy. Neonatal STZ administration caused mild hyperglycemia during pregnancy and changed some aspects of maternal care. The hyperglycemic intrauterine milieu impaired physical development and increased immobility in the open field in the offspring although the latter effect appeared at different ages for males (adulthood) and females (infancy). There was no impairment in the sexual behavior of either male or female offspring. As adults...

Ivermectin reduces sexual behavior in female rats

Moreira, N.; Bernardi, Maria Martha; Spinosa, Helenice de Souza
Fonte: Elsevier; Oxford Publicador: Elsevier; Oxford
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.02%
Ivermectin (IVM) is an antiparasitic drug that iswidely used in domestic animals. Inmammals, IVMacts as a γ-aminobutyric acid (GABA) receptor agonist. This neurotransmitter plays an important role in the regulation of female sexual behavior. The present study investigated the effects of therapeutic (0.2 mg/kg) and high (1.0 mg/kg) IVM doses on female sexual behavior in physiological and pharmacological conditions. Female rats in estrus or treated with estradiol valerate to induce sexual behavior 24 h before the experiments were used. Ivermectin was administered 15 min before the sexual observations. The number of lordosis events in 10 mounts was recorded to calculate the lordosis quotient. The intensity of lordosis (0 [no lordosis], 1 [low lordosis], 2 [normal lordosis] and 3 [exaggerated lordosis]) was scored. In estrus and hormonal treated female rats, both IVM doses decreased the intensity of the lordosis reflex and the percentage of females that presented high levels of lordosis (exaggerated lordosis). However, the number of females that presented lordosis was unaltered. We conclude that in both hormonal conditions, 0.2 mg/kg IVM treatment reduced female sexual behavior and the execution of the lordosis reflex. The present results may be useful for avoiding the side effects of this drug in veterinary practice.; Source of funding CNPq.

Comportamento sexual e reprodutivo de Sphenophorus levis Vaurie, 1978 (Coleoptera: Curculionidae) em cana-de-açúcar; Sexual and reproductive behavior of Sphenophorus levis Vaurie, 1978 (Coleoptera: Curculionidae) in sugarcane

Barreto-Triana, Nancy Del Carmen
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 07/04/2009 PT
Relevância na Pesquisa
46.1%
Com o objetivo de obter informações básicas sobre a bioecologia e o comportamento de Sphenophorus levis Vaurie, foram realizados diferentes bioensaios para conhecer seu comportamento sexual e reprodutivo; obter e testar a atividade biológica de seu feromônio natural em condições de laboratório e campo; verificar a eficiência de captura do feromônio sintético de agregação em condições de campo; determinar o tipo de armadilha mais eficiente para a captura e manejo de adultos; e avaliar o raio de ação das atuais armadilhas. Os resultados mostraram que S. levis, acasala-se em qualquer hora do dia, tem múltiplas cópulas, e os casais entre 14 e 35 dias de idade apresentaram as maiores frequências de cópulas, com 76 a 88%, respectivamente. A duração média da primeira cópula foi de 5,75 ± 4,22 h, e o tempo total de cópula variou entre 1 a 17 h. O período de pré-oviposição em fêmeas entre 14 e 35 dias, foi de 5,52 ± 4,53 a 10,90 ± 5,37 dias. O número de ovos/fêmea foi de 0,25 a 7,80, com viabilidade entre 33 e 63%. Fêmeas de S. levis com idade avançada entre 85 e 210 foram receptivas ao acasalamento (66%), ovipositaram entre 4,50 a 7,09 ovos, com viabilidade entre 49 e 79%. Machos e fêmeas de S. levis aptos ao acasalamento...

Comportamento sexual da broca-do-café, Hypothenemus hampei (Ferrari, 1867) (Coleoptera: Curculionidae: Scolytinae); Sexual behavior of coffee berry borer, Hypothenemus hampei (Ferrari, 1867) (Coleoptera: Curculionidae: Scolytinae)

Silva, Weliton Dias da
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 10/02/2010 PT
Relevância na Pesquisa
56.03%
O estudo do comportamento sexual dos insetos abrange todos os eventos ocorridos desde a formação dos casais por meio do cortejo, até a separação dos mesmos após a cópula. Esses estudos são importantes e representam o primeiro passo em pesquisas que visam à elucidação de feromônios da espécie alvo. No caso da broca-do-café, Hypothenemus hampei (Ferrari), que é considerada mundialmente a principal praga do café, existe uma lacuna de informações sobre o comportamento sexual dessa espécie. Além disso, as pesquisas têm sido direcionadas para o uso de armadilhas contendo alcoóis (ex: etanol e metanol) visando o manejo dessa praga, mas com resultados conflitantes. Em razão disso, o objetivo do presente trabalho foi estudar o comportamento sexual de H. hampei, como suporte para estudos subseqüentes visando a elucidação do feromônio da espécie. As cópulas de H. hampei ocorreram em qualquer horário dentro de um ciclo de 24 horas. Embora em menor freqüência, 60% dos casais realizaram pelo menos uma cópula na idade de 0-24 horas, chegando a 100% dos casais nas demais idades. A maior atividade sexual foi observada nas idades de 48-72 e 72-96 horas, onde, nessa última, ocorreram 6,9 ± 0,47 cópulas por casal com duração de 2...

Comportamento sexual e características seminais de suínos jovens com diferentes desempenhos de crescimento; Sexual behavior and sperm characteristics in young young boars with different growing performance

Ferreira, Fabiane Mendonca; Wentz, Ivo; Scheid, Isabel; Afonso, Simone Bonine; Guidoni, Antonio Lourenco; Bortolozzo, Fernando Pandolfo
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
POR
Relevância na Pesquisa
56.13%
A capacidade reprodutiva dos machos é de grande importância na eficiência da indústria de criação animal. A investigação de características reprodutivas fornece informações sobre a idade ideal à primeira coleta de sêmen. O objetivo deste trabalho foi avaliar o comportamento sexual e as características seminais de machos suínos jovens com diferentes ganhos de peso do nascimento aos 100kg. Aos 143 dias de idade, 62 machos Landrace e Large White com 810 a 885g/dia (n=29) (grupo de desempenho 1; GD1) e com 649 a 694g/dia (n=33) (GD2) foram avaliados quanto ao comportamento sexual. A partir de 150 dias, foi coletado sêmen de 33 destes machos duas vezes por semana durante onze semanas. As características seminais foram monitoradas até que os machos atingissem os 232 dias de idade. Machos GD2 tiveram melhor performance sexual que machos GD1 quando expostos a fêmeas em estro. Houve aumento do volume de sêmen, da concentração e da motilidade espermáticas e do número total de espermatozóides no ejaculado. Machos GD1 ejacularam maiores volumes de sêmen (p=0,043) que machos GD2, mas com maior percentual de espermatozóides anormais (p=0,022). Machos GD2 ejacularam sêmen com maior concentração espermática (p=0,027). Não foram encontradas diferenças entre os grupos de desempenho em relação à motilidade espermática (p=0...

Efeito do estresse sobre o comportamento sexual de fêmeas : participação da angiotensina II

Feil, Helena Cláudia de Pelegrin Basso
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.08%
Situações estressantes provocam a ativação dos eixos hipotálamo-hipófise-adrenal (HPA) e simpato-adrenal. A ativação destes sistemas leva a alterações comportamentais e periféricas que melhoram a habilidade do organismo para enfrentar a ameaça estressora e retornar à homeostase, aumentando, desta forma, a sua chance de sobrevivência. Dentre as alterações produzidas pela resposta ao estresse inclui-se a inibição da função reprodutiva, atribuída à ação central do hormônio liberador de corticotropina (CRH). Além da ativação dos eixos HPA e simpato-adrenal, os estímulos estressantes aumentam o nível de Angiotensina II (Ang II) central e periférico. Além das múltiplas funções bem conhecidas na regulação do equilíbrio hídrico e da pressão arterial, a Ang II exerce também um papel inibidor do comportamento sexual e é um importante estimulador do eixo HPA, por estimular a secreção do CRH. Neste trabalho foi testada a hipótese de que a inibição do comportamento sexual, produzida pelo estresse, ocorre via estimulação do eixo HPA, pela Ang II, na porção parvocelular do núcleo paraventricular hipotalâmico (PVN). Para tanto, o trabalho foi dividido em dois experimentos. O primeiro estudou o “Efeito da administração sistêmica crônica de Losartan sobre a inibição do comportamento de fêmeas...

Comportamento sexual e morfometria geométrica em caracteres somáticos e sexuais em Paratrechalea (Araneae; Trechaleidae) : evidências para a proposta de um novo táxon

Schmidt, Luiz Ernesto Costa
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.1%
O estudo de comportamentos inusitados observados em populações naturais de qualquer organismo exige que suas bases descritivas sejam primeiramente estabelecidas antes de permitir a aplicação de abordagens experimentais. A Ordem Araneae é reconhecida pela enorme diversidade de formas e hábitos, onde destaco as aranhas do gênero Paratrechalea Carico, 2005 tanto pela presença de um comportamento atípico quanto por uma particularidade ecológica entre algumas de suas espécies. Estudos preliminares relativos à distribuição das espécies do gênero indicaram uma região de distribuição sintópica entre duas delas: P. azul Carico, 2005 e P. ornata (Mello-Leitão, 1943). Além disso, durante o comportamento sexual destas espécies, os machos oferecem presentes nupciais na forma de uma presa envolta em seda, sendo o primeiro registro deste comportamento para a fauna de aranhas Neotropicais. Para as descrições apresentadas na tese, foram utilizadas combinações de amostras que compõem o conjunto de dados total: uma amostra de P. azul e outra de P. ornata em condição de sintopia provenientes do Brasil, uma amostra Brasileira de P. galianoae Carico, 2005, e duas amostras Uruguaias de P. ornata. A análise descritiva do comportamento sexual mostrou que presentes nupciais não apenas fazem parte do cortejo sexual destas espécies...

Prenatal testosterone supplementation alters puberty onset, aggressive behavior, and partner preference in adult male rats

Dela Cruz, Cynthia; Pereira, Oduvaldo C. M.
Fonte: Springer Tokyo Publicador: Springer Tokyo
Tipo: Artigo de Revista Científica Formato: 123-131
ENG
Relevância na Pesquisa
56.05%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); The objective of this study was to investigate whether prenatal exposure to testosterone (T) could change the body weight (BW), anogenital distance (AGD), anogenital distance index (AGDI), puberty onset, social behavior, fertility, sexual behavior, sexual preference, and T level of male rats in adulthood. To test this hypothesis, pregnant rats received either 1 mg/animal of T propionate diluted in 0.1 ml peanut oil or 0.1 ml peanut oil, as control, on the 17th, 18th and 19th gestational days. No alterations in BW, AGD, AGDI, fertility, and sexual behavior were observed (p > 0.05). Delayed onset of puberty (p < 0.0001), increased aggressive behavior (p > 0.05), altered pattern of sexual preference (p < 0.05), and reduced T plasma level (p < 0.05) were observed for adult male rats exposed prenatally to T. In conclusion, the results showed that prenatal exposure to T was able to alter important aspects of sexual and social behavior although these animals were efficient at producing descendants. In this sense more studies should be carried to evaluated the real impact of this hormonal alteration on critical period of sexual differentiation on humans, because pregnant women exposed to hyperandrogenemia and then potentially exposing their unborn children to elevated androgen levels in the uterus can undergo alteration of normal levels of T during the sexual differentiation period...

Neonatal inhalatory anesthetic exposure: Reproductive changes in male rats

Arena, A. C.; Pereira, O. C M
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 633-640
ENG
Relevância na Pesquisa
46.17%
We investigated the effects of an inhalatory anesthetic (ethyl ether) during the neonatal period of brain sexual differentiation on the later fertility and sexual behavior of male rats. Animals were exposed to ethyl ether immediately after birth. At adulthood, body weight, testes wet weight, and plasma testosterone levels were not affected; however, neonatal exposure to ether showed alterations on male fertility: a decrease in the number of spermatids and spermatozoa, an increase in the transit time of cauda epididymal spermatozoa and a decrease in daily sperm production. An alteration of sexual behavior was also observed: decreased male sexual behavior and appearance of homosexual behavior when the male rats were castrated and pretreated with exogenous estrogen. Probably, the ether delayed or reduced the testosterone peak of the sexual differentiation period, altering the processes of masculinization and defeminization of the hypothalamus. Our results indicate that perinatal exposure to ethyl ether during the critical period of male brain sexual differentiation, acting as endocrine disruptors, has a long-term effect on the fertility and sexual behavior of male rats, suggesting endocrine disruption through incomplete masculinization and defeminization of the central nervous system. © 2002 Elsevier B.V. All rights reserved.

Programming effects of antenatal corticosteroids exposure in male sexual behavior

Oliveira, Mário; Leão, Pedro; Rodrigues, Ana João; Pêgo, José M.; Cerqueira, João; Sousa, Nuno
Fonte: International Society for Sexual Medicine Publicador: International Society for Sexual Medicine
Tipo: Artigo de Revista Científica
Publicado em /07/2011 ENG
Relevância na Pesquisa
76.05%
The authors would like to thank the Clinical Laboratory of Hospital de Braga for technical support.; Introduction: Brain regions implicated in sexual behavior begin to differentiate in the last trimester of gestation. Antenatal therapy with corticosteroids is often used in clinical practice during this period to accelerate lung maturation in pre-term risk pregnancies. Clinical and animal studies highlighted major behavioral impairments induced later in life by these treatments, especially when synthetic corticosteroids are used. Aim: To evaluate the implications of acute prenatal treatment with natural versus synthetic corticosteroids on adult male rat sexual behavior and its neurochemical correlates. Methods: Twelve pregnant Wistar rats were injected with dexamethasone (DEX-1mg/kg), corticosterone (CORT-25mg/kg) or saline on late gestation (pregnancy days 18 and 19). Following this brief exposure to corticosteroids, we assessed the sexual behavior of the adult male progeny and subsequently correlated these behaviors with the levels of cathecolamines and mRNA of dopamine and androgen receptors (AR) in brain regions relevant for sexual behavior. Main Outcome Measures: Sexual behavior of adult male offspring was assessed by exposure to receptive females. This was correlated with serum testosterone levels and levels of cathecolamines (determined by HPLC) and dopamine and androgen receptors mRNA expression (real-time PCR) in brain regions implicated in sexual behavior. Results: Prenatal DEX exposure resulted in a decreased number and increased latency time to mounts and intromissions in adulthood. These findings correlated with decreased levels of serum testosterone and increased hypothalamic expression of AR mRNA. DEX animals also displayed lower dopamine levels and higher dopamine receptor mRNA expression both in hypothalamus and nucleus accumbens (NAcc). The milder phenotype of CORT animals was correlated only with decreased dopamine levels in NAcc. Conclusion: Antenatal corticotherapy programs adult male sexual behavior through changes in specific neuronal and endocrine mediators. Importantly...

Disinhibition in Risky Sexual Behavior in Men, but Not Women, during Four Years of Antiretroviral Therapy in Rural, Southwestern Uganda

Kembabazi, Annet; Bajunirwe, Francis; Hunt, Peter W.; Martin, Jeffrey N.; Muzoora, Conrad; Haberer, Jessica E.; Bangsberg, David R.; Siedner, Mark J.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
EN_US
Relevância na Pesquisa
66.08%
Background: In resource-rich areas, risky sexual behavior (RSB) largely diminishes after initiation of anti-retroviral therapy, with notable exceptions among some populations who perceive a protected benefit from anti-retroviral therapy (ART). Yet, there is limited data about long-term trends in risky sexual behavior among HIV-infected people in sub-Saharan Africa after initiation of anti-retroviral therapy. Methods: We administered questionnaires every three months to collect sexual behavior data among patients taking ART in southwestern Uganda over four years of follow-up time. We defined RSB as having unprotected sex with an HIV-negative or unknown status partner, or unprotected sex with a casual partner. We fit logistic regression models to estimate changes in RSB by time on ART, with and without adjustment for calendar year and CD4 count. Results: 506 participants were enrolled between 2005 and 2011 and contributed a median of 13 visits and 3.5 years of observation time. The majority were female (70%) and median age was 34 years (interquartile range 29–39). There was a decrease in the proportion of men reporting RSB from the pre-ART visit to the first post-ART visit (16.2 to 4.3%, p<0.01) but not women (14.1 to 13.3%, p = 0.80). With each year of ART...

Dietary energy intake and sexual behavior of Toggenburg goats.

OLIVEIRA, J. S.; ESTEVES, L. V.; MAGÃO, J. V. P.; FÉRES, L. F. R.; TORRES FILHO, R. A.; RODRIGUES, C. A. F.; FONSECA, J. F. da; BRANDÃO, F. Z.
Fonte: In: INTERNATIONAL CONFERENCE ON GOATS, 10., 2010, Recife. Technological development and associative attempts to a sustainable small livestock production: annals. Little Rock: IGA, 2010. 1 f. 1 CD-ROM. Publicador: In: INTERNATIONAL CONFERENCE ON GOATS, 10., 2010, Recife. Technological development and associative attempts to a sustainable small livestock production: annals. Little Rock: IGA, 2010. 1 f. 1 CD-ROM.
Tipo: Resumo em anais de congresso (ALICE)
EN
Relevância na Pesquisa
65.99%
In order to evaluate the sexual behavior of Toggenburg goats fed with different dietary energy, 32 kids in reproductive age and free of any reproductive pathology were divided in 3 groups according to the dietary treatment. Group 1, maintenance (M) (n=11); Group 2, supplied energy 1.5 times energy maintenance (1.5M) (n=10); and Group 3, supplied energy 2.0 times energy maintenance (2.0M) (n=11). The estrus cycles of all kids were induced and synchronized by insertion of an intravaginal sponge impregnated with 60mg Medroxyprogesterone Acetate. An ultrasound scanner fitted with an 8.0-MHz linear transducer, adapted for small ruminants was used to determine ovulation time and females were tested for estrus twice daily after sponge removal by the use of a male goat. Time between sponge removal and beginning of estrus and from beginning of estrus until ovulation, as well as estrus length were measured. Results were analyzed by the Duncan test employing a significancy level of P <0.05. All animals from groups 1 and 2 (100%) had signs of estrus while one goat from group 3 did not show signs (9.10%). Estrus length had no differences between groups (Group 1: 31.63 ± 12.32 hours; Group 2: 43.20 ± 12.90 hours; Group 3: 40.80 ± 14.08 hours ? P>0.05). Time between sponge removal and beginning of estrus also did not differ (Group 1: 28.00 ± 12.00 hours; Group 2: 32.80 ± 11.59 hours; Group 3: 30.40 ± 14.08 hours ? P>0.05) but time from beginning of estrus until ovulation was substantially shorter in group 3 (15.13 ± 8.63 hours ? P <0.05) than other groups (Group 1: 28.28 ± 12.57 hours; Group 2: 27.00 ± 14.40 hours). We conclude that animals fed with high energy diet ovulates faster than others after the onset of estrus.; 2010

Comportamento sexual de cabras sob efeito macho criadas em sistema agrossilvipastoril.

SOUSA, S. D.; BRITO, I. F.; ÁVILA, A. A.; ANDRIOLI, A.; GADELHA, C. R. F.; MONTENEGRO, A. R.
Fonte: Ciência Animal, Fortaleza, v. 22, n. 1, p. 331-334, 2012. suplemento. Publicador: Ciência Animal, Fortaleza, v. 22, n. 1, p. 331-334, 2012. suplemento.
Tipo: Artigo em anais de congresso (ALICE)
PT_BR
Relevância na Pesquisa
55.98%
Sexual behavior of goats under male effect created in agrosilvopasture system. Abstract:It was performed a breeding season lasting 45 days, in it waswhich assessed the sexual behavior of 16 Anglonubians goats through anethogram divided into behavioral and physical signs. Data were analyzed by chi-square test. The behavioral signs like seeking male, shaking tail, mount or let it ride for others females and the physicists like red and swollen vulva showed a significant relationship (p< 0,05) with the sexual receptivity of the female to the male. The estrus concentration occurred until the fourth week (around thirty days), resulting in 93.75% of pregnancy. While in the fifth week it was not observed signs of estrus. Therefore, the visual identification of the receptive female to the male reduces using of the reproductives in excess. Moreover the period of thirty days for the breeding season was satisfactory for the reproductive success.; 2012; Trabalho apresentado no 6o. Congresso Norte Nordeste de Reprodução animal, Fortaleza.

Uso de homeopatia para controle da sodomia em machos bovinos mestiços inteiros sob confinamento

Silva, Ana Gabriela Francisco da
Fonte: Universidade Federal de Mato Grosso do Sul Publicador: Universidade Federal de Mato Grosso do Sul
Tipo: Dissertação de Mestrado
POR
Relevância na Pesquisa
56.06%
Buscou-se verificar a eficiência de um bionúcleo homeopático com Chamomila e Artemísia sobre o comportamento sócio-sexual de machos bovinos mestiços inteiros em confinamento. Utilizou-se 225 animais com média de 385 Kg e idade entre 24 e 36 meses, alimentados com dieta padrão contendo 82 % de concentrado e 18 % de volumoso, os animais foram distribuídos em quatro tratamentos – controle, veículo, HOM1 e HOM2. Foram observados por 60 dias para as características sócio-sexuais, cabeçada (CAB), choque de cabeça (CHQCAB), cabeça-cabeça (CABCAB), reflexo de flehmen (RF), monta (MT), tentativa de monta (TM) e fuga de monta (FUGMT). Encontrou-se redução significativa da sodomia e tentativa de monta (p<0,05) de 4,00 no grupo tratado HOM1 e 9,04 no grupo controle, em tentativa de monta de 2,21 no grupo tratado e de 5,32 no controle. O uso da homeopatia reduziu significativamente a sodomia (P<0,05).; We sought to assess the effectiveness of a homeopathic bionúcleo with Chamomila and Atermísia on the socio-sexual behavior of male crossbred cattle feedlot whole. We used 225 animals with an average of 385 kg and aged between 24 and 36 months, fed a standard diet containing 82% concentrate and 18% forage, the animals were divided into four treatments - control...

Transforming growth factor-β1 null mutation causes infertility in male mice associated with testosterone deficiency and sexual dysfunction; Transforming growth factor-beta1 null mutation causes infertility in male mice associated with testosterone deficiency and sexual dysfunction

Ingram, W.; Robertson, S.
Fonte: Endocrine Soc Publicador: Endocrine Soc
Tipo: Artigo de Revista Científica
Publicado em //2007 EN
Relevância na Pesquisa
55.9%
TGFß1 is a multifunctional cytokine implicated in gonad and secondary sex organ development, steroidogenesis, and spermatogenesis. To determine the physiological requirement for TGFß1 in male reproduction, Tgfb1 null mutant mice on a Prkdcscid immunodeficient background were studied. TGFß1-deficient males did not deposit sperm or induce pseudopregnancy in females, despite an intact reproductive tract with morphologically normal penis, seminal vesicles, and testes. Serum and intratesticular testosterone and serum androstenedione were severely diminished in TGFß1-deficient males. Testosterone deficiency was secondary to disrupted pituitary gonadotropin secretion because serum LH and to a lesser extent serum FSH were reduced, and exogenous LH replacement with human chorionic gonadotropin (hCG) induced serum testosterone to control levels. In the majority of TGFß1-deficient males, spermatogenesis was normal and sperm were developmentally competent as assessed by in vitro fertilization. Analysis of sexual behavior revealed that although TGFß1 null males showed avid interest in females and engaged in mounting activity, intromission was infrequent and brief, and ejaculation was not attained. Administration of testosterone to adult males...

Prenatal lipopolysaccharide exposure affects maternal behavior and male offspring sexual behavior in adulthood

BERNARDI, Maria Martha; KIRSTEN, Thiago Berti; MATSUOKA, Suzana M.; TEODOROV, Elizabeth; HABR, Soraya Ferreira; PENTEADO, Sandra H. W. N.; PALERMO-NETO, João
Fonte: Karger; Basel Publicador: Karger; Basel
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
56.09%
Objective: This study investigates the effects of prenatal lipopolysaccharide (LPS) exposure on the maternal behavior of pregnant rats and the physical development and sexual behavior of their male offspring in adulthood. Methods: For two experiments, pregnant rats were injected with LPS (250 µg/kg, i.p.) on gestation day (GD) 21. In the first experiment, the maternal behavior (postnatal day, PND, 6) and the dam's open-field general activity (PND7) were evaluated. In the second experiment, the maternal pre- and postnatal parameters, the pup's development, the offspring's sexual behavior in adulthood, and the pup's organ weights were assessed. Results: Compared to the control group, the LPS-treated dams presented reduced maternal behavior, decreased general activity, a smaller body weight difference between GD21 and PND1, a greater number of perinatal deaths, and smaller litters. For the male pups, LPS treatment resulted in a decreased body weight on PND2, whereas the anogenital distance and the day of testis descent were not modified. The male sexual behavior was impaired by prenatal LPS. Particularly the number of ejaculating animals was reduced. The testis weight was also lower in the prenatally LPS-treated rats than in the control rats. Conclusion: We propose that prenatal LPS exposure on GD21 acts as an imprinting factor that interferes with the programming of brain sexual determination in offspring

Reprodução de avestruzes: uma revisão da fisiologia e do comportamento; Ostrich reproduction: a review on physiology and behavior

SILVA, Guilherme Costa de Oliveira e; GUIMARÃES, Marcelo Alcindo de Barros Vaz
Fonte: Colégio Brasileiro de Reprodução Animal; Belo Horizonte Publicador: Colégio Brasileiro de Reprodução Animal; Belo Horizonte
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
66.03%
Esta revisão objetiva analisar as informações existentes em relação à fisiologia reprodutiva do avestruz, abordando as variações das concentrações de progesterona (P4), estradiol (E2), testosterona (T) e LH durante o período reprodutivo, assim como a correlação destas concentrações com aspectos comportamentais sexuais. Semelhante ao descrito em aves domésticas, o LH e o FSH regulam o crescimento folicular e mantêm a hierarquia dos folículos maduros, sendo que o LH parece exercer um papel mais importante no controle destas funções e na esteroidogênese. Aparentemente, ocorre um aumento marcado das concentrações de P4 & E2 nas fêmeas e T nos machos a partir do início da época reprodutiva com queda pronunciada ao término desta; This review aims to analyze the existing information about reproductive physiology of the ostrich, related to the changes on progesterone (P4), estradiol (E2), testosterone (T) and LH levels during the reproductive period and the relationship of them with the ostrich's sexual behavior. Similar to others avian species, the LH and FSH regulate the follicular growth and maintain the follicle hierarchy. LH seems to have a more important role in controlling these activities and in steroidogenesis. There is a marked increase of P4 and E2 levels in females and T level in males at the beginning of the reproductive period...

Efeitos da moxidectina no comportamento sexual de ratos machos; Effects of moxidectin on male rats' sexual behavior

Rodrigues Alves, Patricia de Sá e Benevides
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 17/03/2003 PT
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76.16%
A moxidectina é uma droga antiparasitária, do grupo das milbemicinas, utilizada em animais domésticos. Em mamíferos seu mecanismo de ação envolve o GABA, neurotansmissor que tem um papel relevante na regulação do comportamento sexual. Assim, o presente trabalho estudou os efeitos da moxidectina no comportamento sexual de ratos machos. Uma vez que alterações na função motora podem interferir na manifestação deste comportamento, avaliou-se, inicialmente, a atividade geral no campo aberto e a coordenação motora na trave elevada, e posteriormente, o comportamento sexual de ratos inexperientes e experientes. A avaliação da atividade geral dos ratos observados no campo aberto mostrou que, mesmo em altas doses (2,0 e 20,0mg/kg), a moxidectina não altera o comportamento de ratos no campo aberto. Esta droga, porém, prejudicou a coordenação motora dos animais avaliados na trave elevada, sendo este efeito atribuído, ao menos em parte, à ação da moxidectina em receptores GABAérgicos. Os resultados obtidos na avaliação do comportamento sexual de ratos inexperientes mostraram redução da motivação sexual dos animais que receberam 0,2mg/kg de moxidectina e foram observados 24 ou 72horas depois. Nenhuma alteração significante foi observada nos diferentes parâmetros do comportamento sexual dos ratos experientes...

Effect of undegradable protein supply on testicular size, spermiogram parameters and sexual behavior of mature Assaf rams

Fernández Gutiérrez, Miguel; Giráldez, Francisco Javier; Frutos, Pilar; Lavín, Paz; Mantecón, Ángel R.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 94510 bytes; application/pdf
ENG
Relevância na Pesquisa
55.93%
12 pages, 2 figures, 2 tables.-- PMID: 15159122 [PubMed].-- Online version available on Dec 5, 2003.; Previously published as proceeding at the XXXI Jornadas de Estudio AIDA (VIII Jornadas sobre Producción Animal) (Zaragoza, Spain, May 11-13, 1999). https://digital.csic.es/handle/10261/14911; Previously published as proceeding at the XXXI Jornadas de Estudio AIDA (VIII Jornadas sobre Producción Animal) (Zaragoza, Spain, May 11-13, 1999). https://digital.csic.es/handle/10261/14914; Eighteen mature Assaf rams were used to study the effect of undegradable protein (UDP) supply on testicular size, sperm production and quality, testosterone secretion and reproductive behavior. Animals were allocated to three groups of six animals each and fed during 10 weeks with different diets which were designed to supply approximately 0.5MJ of metabolisable energy (ME)/kg LBW(0.75) and 9 g of effective rumen degradable protein (ERDP)/MJ of fermentable ME to all animals and to induce differences in rumen UDP intake (0.97, 1.72 and 3.08 g of UDP/kg LBW(0.75) for LP, MP and HP diets, respectively). Neither plasma testosterone concentration nor reproductive behavior parameters (number of services, number of mounts without ejaculation and reaction time to first mount) were affected (P > 0.05) by protein intake. Nevertheless...

Operational sex ratio and density do not affect directional selection on male sexual ornaments and behavior

Head, Megan; Lindholm, Anna K.; Brooks, Rob
Fonte: Society for the Study of Evolution Publicador: Society for the Study of Evolution
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
56.06%
Demographic parameters including operational sex ratio (OSR) and population density may influence the opportunity for, and strength of sexual selection. Traditionally, male-biased OSRs and high population densities have been thought to increase the opportunity for sexual selection on male sexual traits due to increased male competition for mates. Recent experimental evidence, however, suggests that male-biased OSRs might reduce the opportunity for sexual selection due to increased sexual coercion experienced by females. How OSR, density, and any resultant changes in the opportunity for sexual selection actually affect selection on male sexual traits is unclear. In this study, we independently manipulated OSR and density in the guppy (Poecilia reticulata) without altering the number of males present. We recorded male and female behavior and used DNA microsatellite data to assign paternity to offspring and estimate male reproductive success. We then used linear selection analyses to examine the effects of OSR and density on directional sexual selection on male behavioral and morphological traits. We found that females were pursued more by males in male-biased treatments, despite no change in individual male behavior. There were no differences in sexual behavior experienced by females or performed by males in relation to density. Neither OSR nor density significantly altered the opportunity for sexual selection. Also...