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Proteinograma do leite de vacas: padrões e variabilidade; Cow milk proteinogram: patterns and variability

Sant'Ana, Valéria Aparecida Caobianco
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 12/08/2004 PT
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A avaliação das modificações no proteinograma do leite tem sido utilizada como meio de diagnóstico das mamites dos bovinos, pois, em decorrência dos processos inflamatórios na glândula mamária, ocorrem alterações, tanto na concentração dos componentes protéicos do leite, como também, surgimento de compostos protéicos não elaborados no processo de secreção láctea. A técnica de fracionamento protéico por eletroforese em gel de poliacrilamida mostrou-se eficiente na detecção de pequenas quantidades de proteínas em fluídos orgânicos. As características das proteínas do leite de vacas sadias, e a avaliação de possíveis fatores de variabilidade foram determinadas em 139 amostras de leite de vacas. Os animais foram, inicialmente, submetidos a exame clínico geral e do úbere, complementado por exames físico-químicos, celulares e microbiológicos do leite, complementares ao diagnóstico das mamites. Do conjunto das amostras, 97 eram de vacas sadias, em plena lactação, sendo utilizadas para estabelecer valores padrões dos constituintes do leite de vacas sadias e avaliar a influência racial - Jersey e Gir; e do número de lactações - animais em primeira lactação, duas ou três lactações e...

Mozzarella de búfala: avaliação da reação em cadeia pela polimerase (PCR) para detectar fraude devido à adição de leite de vaca ao de búfala; Buffalo mozzarella: assessment by polymerase chain reaction (PCR) to detect fraud due to the addition of cow milk to buffalo

Souza, Gisele Oliveira de
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 06/12/2010 PT
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Mozzarella de búfala é um queijo de fácil fabricação e que tem grande aceitabilidade no mercado. Esses fatos, associados ao melhor rendimento de fabricação e maior valor agregado, quando comparado ao similar feito com leite de vaca, têm estimulado a fraudação. Embora a PCR já seja uma técnica reconhecida para garantir a autenticidade da mozzarella de búfala em outros países, é necessária sua validação para as condições do rebanho nacional. O presente trabalho teve como objetivo avaliar a PCR para a detecção de adulteração de queijo tipo mussarela de búfala no Brasil, em condições experimentais. Utilizou-se dois primer, já descritos na literatura, para detecção do gene citocromo b (cytb) de bovino e de bubalino. Esses primers foram testados em sangue das raças Nelore e Holandês (representantes, respectivamente, das espécies Bos indicus e Bos taurus), e em sangue da raça Mediterrânea (Bubalus bubalis). Também foram testados em leite e na mozzarella, tanto nos produtos puros como em misturas. Os primers reconheceram especificamente o DNA bovino e bubalino tanto no sangue quanto no leite e mozzarella. A técnica foi mais sensível para detectar a fraude na mozzarella que no leite. Na mozzarella foi possível detectar a presença de 0...

Má absorção de lactose em crianças e adolescentes : diagnóstico através do teste do hidrogênio expirado com o leite de vaca como substrato; Lactose malabsorption in children and adolescents : diagnosis through breath hydrogen test using cow milk

Pretto, Fernanda Menegaz; Silveira, Themis Reverbel da; Menegaz, Virginia; Oliveira, Jarbas Rodrigues de
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
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Objetivo: determinar a prevalência de má absorção de lactose e sua associação com a cor da pele e com a idade em crianças e adolescentes de escolas públicas do município de Porto Alegre. Métodos: foi realizado um estudo transversal, que incluiu 225 indivíduos de 8 a 18 anos, alunos de duas escolas públicas do município de Porto Alegre. A seleção dos alunos ocorreu através de sorteio. Os participantes foram classificados segundo a cor da pele (brancos e não-brancos), e a faixa etária (8 a 12 e 13 a 18 anos). A má absorção de lactose foi diagnosticada através do teste do hidrogênio expirado após ingestão de 250ml de leite de vaca integral industrializado. O teste teve duração de 3 horas, com coletas em jejum e aos 60, 120 e 180 minutos após a ingestão do leite. Foi considerado como critério de positividade o aumento > 20 ppm na concentração de hidrogênio em relação ao nível basal. Resultados: foram estudados 225 alunos, com uma média e desvio-padrão de idade de 12,2 ± 2,0 anos. Cento e trinta e quatro indivíduos eram do sexo feminino (59,6%). Cento e cinqüenta e quatro alunos eram de cor branca (68,4%) e os restantes, de cor nãobranca. A má absorção de lactose foi evidenciada em 19/225 casos (8...

Metodologia para quantificação do risco das tecnologias na pecuária de cria; Methodology for risk measurement of the technologies in cow-calf systems

Oliveira, Tamara Esteves de
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Dissertação Formato: application/pdf
POR
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Este trabalho propõe uma metodologia para auxiliar o empresário rural no momento de decidir qual a tecnologia menos arriscada para aumentar a taxa de prenhez em seu sistema de produção de bezerros. Para tanto, foram avaliadas as percepções de especialistas quanto a sete fatores a partir dos quais foi desenvolvida uma equação para calcular este risco. Tais parâmetros e suas definições foram apresentados em questionários aos 18 especialistas, selecionados por amostragem não probabilística. Neste documento foram listadas 32 tecnologias, avaliadas de acordo com os parâmetros conforme a escala Likert de cinco níveis. Foram utilizados os parâmetros relacionados diretamente ao risco das tecnologias, atribuindo-se um valor conforme a nota dos especialistas, de forma a ajusta-las conforme sua influência no risco, se positiva ou negativa. Não houve diferença significativa entre o risco calculado e o estimado pelos especialistas, além de ambos apresentarem alta correlação, validando esta metodologia. As tecnologias de insumo se apresentaram mais arriscadas, indicando custo, complexidade operacional e conhecimento técnico mais elevados do que as de processo. Da mesma forma, as tecnologias de manejo demonstraram menor risco em relação às nutricionais e reprodutivas...

Co-digestion of cow manure, food waste and intermittent input of fat

Neves, L.; Oliveira, Rosário; Alves, M. M.
Fonte: Elsevier Ltd. Publicador: Elsevier Ltd.
Tipo: Artigo de Revista Científica
Publicado em /03/2009 ENG
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Pulses of oil were added to completely mixed reactors fed with dairy cow manure and food waste, after achieving a stable performance at an organic loading rate of 4.6 ± 0.1 gCOD/(lreactor day), an oily waste effluent from a canned fish processing industry was fed in the form of pulses. The oil concentration rose up to 9, 12, 15 and 18 gCODoil/lreactor, after the pulse feeding in the reactor. The highest fat concentration of 18 gCODoil/lreactor promoted a persistent inhibition in the process of the continuous reactor, although in batch assays, the reactor content evidenced a capacity to degrade more oil and to degrade the accumulated organic matter. All the other pulses had a positive effect in the methane production. From a practical point of view, this work demonstrates that controlled intermittent inputs of oil can enhance the methane production in a co-digestion of cow manure and food waste.; Fundação para a Ciência e Tecnologia (FCT) -; Fundo Social Europeu (FSE) - SFRH/BD/18174/2004

Fate of LCFA in the co-digestion of cow manure, food waste and discontinuous addition of oil

Neves, L.; Oliveira, Rosário; Alves, M. M.
Fonte: Elsevier Ltd. Publicador: Elsevier Ltd.
Tipo: Artigo de Revista Científica
Publicado em /12/2009 ENG
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Different concentrations of oily waste were added in a discontinuous mode and recurrently to anaerobic continuous stirred tank reactors fed with cow manure and food waste. Four continuous stirred tank reactors were run in parallel. A control reactor (R1) received no additional oil and R2, R3 and R4 received increasing concentrations of oil in two different experimental approaches. First, the lipids composition was forced to change suddenly, in three moments, without changing the total chemical oxygen demand (COD) fed to the reactors. The only long chain fatty acid (LCFA) detected onto the R1 solid matrix was palmitic acid (C16:0). Nevertheless in the solid matrix of R2, R3 and R4 C16:0 and stearic acid were detected. For occasional increase in the oil concentration up to 7.7 gCODoil/Lreactor (55% OilCOD/TotalCOD) no statistical differences were detected between the reactors, in terms of methane production, effluent soluble COD, effluent volatile fatty acids and total and volatile solids removal. Therefore this experiment allowed to conclude that cow manure–food waste co-digestion presents sufficient buffer capacity to endure solid-associated LCFA concentration up to 20–25 gCOD-LCFA/kgTS. In a second experiment higher concentrations of oil were added...

Co-composting of cow manure with food waste : the influence of lipids content

Neves, L.; Ferreira, Vânia; Oliveira, Rosário
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em //2009 ENG
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Addition of an oily waste to a co-composting process of dairy cow manure with food waste, and the influence in the final product was evaluated. Three static composting piles with different substrates concentrations were assessed. Sawdust was also added to all composting piles to attain 60%, humidity at the beginning of the process. In pile 1, the co-substrates were the solid-phase of dairy cow manure, food waste and sawdust as bulking agent. In piles 2 and 3 there was an extra input of oily waste of 7 and 11% of the total volume, respectively, corresponding to 18 and 28% in dry weight. The results showed that the co-composting process was feasible even at the highest fat content. Another positive effect due to the oily waste addition was the requirement of extra humidity, due to the hydrophobic properties of this specific waste, which may imply reduced need of a bulking agent. Moreover, this study shows that composting can be a feasible way of adding value to fatty wastes. The three final composts presented very similar and suitable properties for land application.

Co-digestion of cow manure, food waste and intermittent input of fat

Neves, L.; Oliveira, Rosário; Alves, M. M.
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em //2008 ENG
Relevância na Pesquisa
36.76%
Pulses of fat were added to completely mixed reactors fed with dairy cow manure (CM) and food waste (FW). After achieving a stable performance at an organic loading rate (OLR) of 4.6± 0.1 gCOD/(Lreactor.day), an oily effluent (OE) from a canned fish processing industry was fed in the form of pulses, raising the lipids concentration up to 9, 12, 15 and 18 gCODfat/Lreactor. The highest fat concentration of 18gCODfat/Lreactor promoted a reversible inhibition in the methane production. All the other pulses had a positive effect in the methane production. From a practical point of view, this work demonstrates that controlled intermittent inputs of fat can enhance the methane production in the co-digestion of CM and FW.

Infuence of inoculum acclimation in the biodegradation rate and estimated biodegradability of cow manure, food waste and oil

Neves, L.; Ferreira, Raquel; Oliveira, Rosário; Alves, M. M.
Fonte: Institutul Politehnic din Iasi Publicador: Institutul Politehnic din Iasi
Tipo: Artigo de Revista Científica
Publicado em //2010 ENG
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Two different inocula - acclimated and non-acclimated to fat- were used to evaluate the methane production of cow manure, food waste and oily waste in batch assays. The inoculum adapted to fat had a better performance in the methanisation of substrates with significant lipids content. Furthermore, it is demonstrated that an increase in the ratio inoculum/substrate can enhance the initial methane production rate of oily waste when using a non-adapted inoculum, improving also the ultimate methane production. Additionally, this work also reveals that changing from mesophilic to thermophilic temperature conditions an inoculum can overcome adaptation setbacks to a substrate, while another one, that displayed good mesophilic performance, can become unproductive. As the results demonstrate, the microbial consortium present in each inoculum can bring about different outcomes while degrading different organic wastes, especially in anaerobic digestion of oily waste.

Management factors and cow traits influencing milk somatic cell counts and teat hyperkeratosis during different seasons

Sandrucci,Anna; Bava,Luciana; Zucali,Maddalena; Tamburini,Alberto
Fonte: Sociedade Brasileira de Zootecnia Publicador: Sociedade Brasileira de Zootecnia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2014 EN
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The objective of the study was to analyze the effect of season, parity, stage of lactation and milking procedures on teat-end condition, cow cleanliness and milk somatic cell count (SCC) and identify risk factors associated with milk somatic cell counts greater than 100,000 cells/mL. A group of 15 Italian dairy farms were visited three times during different seasons: the cold (3.8 °C), the hot (23.5 °C) and the mild (12.1 °C) seasons. Hygiene of udder, flanks and legs was scored on 2,330 cows based on a 4-point scale system, from very clean (score 1) to very dirty skin (score 4). On the same cows, a total of 9,201 teats were assessed for teat-end condition and assigned to four different classes of hyperkeratosis: No lesion (N), Smooth ring (S), Rough (R) and Very rough skin (VR). The average percentage of teats classified in the worst classes of hyperkeratosis (R and VR) equaled 15.9%. Teat hyperkeratosis, cow cleanliness and milk somatic cell count were significantly affected by the season. Teat condition was significantly better in primiparous than in multiparous cows and deteriorated during lactation. Cows with the lowest values of SCC, better teat conditions and better hygiene scores were found in the farms where more than one milking practice (among forestripping...

Growth capacity of thermotolerant campylobacters in culture media supplemented with pig and cow blood

Tresierra-Ayala,Álvaro; Navas,Manuel; Flores,Josué; Perea,Ramsés; Huanaquiri,Juan; Bendayán,María; Fernández,Heriberto
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2010 EN
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In this work 60 thermotolerant Campylobacter strains (37 C. jejuni and 23 C. coli) isolated from the cows, pigs, chickens and ducks (15 strains of each type of animal) were used to establish their growth capacity on media containing cow or swine blood as potential substitutes of sheep or horse blood. The growth capacity was assessed by viable counts on cow and swine blood media, using the modified Miles and Misra method. Campylobacter strains showed better growth in the media supplemented with pig or sheep blood than with cow blood. Thus, the use of pig blood could be a supplement for Campylobacter culture medium, when there was no availability of sheep or horse blood.

Preliminary study on the effect of anaerobically digested cow dung slurry on the antimicrobial activity of three medicinal plants

Yongabi, K.; Harris, P.; Lewis, D.; Agho, M.
Fonte: Academic Journals Publicador: Academic Journals
Tipo: Artigo de Revista Científica
Publicado em //2009 EN
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The study investigated the effect of anaerobically digested cow dung using polyethylene tube digester on the antimicrobial property of Aloe barbadensis, (Aloe vera) Allium sativum (Garlic) and Zingiber officinale (Ginger). The methanol extracts of the three medicinal plants grown on soil augmented with anaerobically digested cow dung slurry exhibited marked antimicrobial activities on Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Asperigillus niger and Trichophyton mentogrophyte isolated from clinical specimens. All the three medicinal plants grown on digested cow dung slurry exhibited greater mean zones of inhibition on all the pathogens than that grown on soil augmented with undigested cow dung and soil not augmented at all. A. sativum (Garlic) raised on digested cow dung slurry exhibited the highest mean zones of inhibitions with spore germination of the fungi totally inhibited when compared with the two other medicinal plants. The results in this study have shown that anaerobically digested cow dung slurry does not only yield pathogen free manure, increased fertilizer and biogas but can improve the antimicrobial activity of medicinal plants.; K. A. Yongabi, P. L. Harris, D. M. Lewis and M. O. Agho

Melatonin-like immunoreactivity in the pineal gland of the cow: an immunohistochemical study

Carvajal, J.C.; Gómez Esteban, M.B.; Carbajo, S.; Muñoz Barragan, L.
Fonte: Murcia : F. Hernández Publicador: Murcia : F. Hernández
Tipo: Artigo de Revista Científica Formato: application/pdf
ENG
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With a view to checking the presence of melatonin in the pineal gland of the cow, in the present work we used six adult animals, ranging in age from one to six years, which were sacrificed at dawn. Sections of 6 µm thickness of Bouin-fixed and paraffin-embedded pineal glands were incubated in an anti-melatonin serum, which was provided by the Institute for Molecular and Cellular Recognition, Gunma University, Maebshi, Japan. After incubation and successive washings in PBS, some of the sections were treated with the avidin-biotinperoxidase complex (ABC) technique using antisera from Sigma, and developed with the method of Graham and Karnovsky (which employs 3,3’-diaminobenzidine and H2O2 as developer). Other sections were incubated in a goat-anti-rabbit IgG (H+L) bound to fluorochrome Cy5 for immunofluorescence studies. An intense reaction for melatonin was observed in the cytoplasm but not in the nucleus of melatonin secreting pinealocytes located in peripheral and intermediate zones of the pineal gland. Immunoabsorption of the antimelatonin primary antibody with melatonin at a dilution of 10 mM per 0.1 ml of serum prevented the reaction, as happened when any of the antisera used in the procedure were used. Immunoabsorption of antimelatonin serum with different amounts of bovine albumin (ranging between 1/5 to 1/50) failed to inhibit the immunoreactivity. When a bovine anti-albumin antibody was employed...

A field experiment investigating the effects of olive husk and cow manure on heavy metal availability in a contaminated calcareous soil from Murcia (Spain)

Clemente Carrillo, Rafael; Paredes, C.; Bernal Calderón, M. Pilar
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 259768 bytes; application/pdf
ENG
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8 pages, 5 tables, 1 figure.; The transfer of heavy metals from the former sites of mining activity in La Unión (Murcia) to the nearby agricultural soils is a serious environmental risk. The effect of two organic wastes, used as soil amendments, on the bioavailability of heavy metals in an agricultural soil and on their accumulation in Beta vulgaris L. var. Nomonta and Beta maritima L. was studied in a field experiment. The soil was a calcareous Xeric Torriorthent and the total metal levels were (mg kg−1): 2706 Zn, 3235 Pb, 39 Cu. The treatments were: fresh cow manure, olive husk and inorganic fertiliser as a control. Two successive crops (B. vulgaris and B. maritima) were grown. The soil was sampled before each planting and after each harvest. B. vulgaris behaved as a metal indicator plant, as its concentrations of heavy metals (Cu, Mn and Pb) in all treatments reflected the extractable soil levels. The high concentrations of metals, especially Pb (5.1–16.8 times the EU limit for plant foodstuffs), revealed a health risk for human and livestock due to the spread of the metal pollution from mining sites to agricultural areas. Cow manure did not alter the DTPA-extractable concentrations of metals in the soil or their absorption by plants in comparison with the control. But olive husk favoured solubility of metals in soils and their accumulation in plants...

Avaliação nutricional do leite de búfala em comparação ao leite de vaca; Nutricional evaluation of buffalo milk in relation to cow milk

Verruma, M.R.; Salgado, J.M.
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/12/1993 POR
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Foi estudado o valor nutricional do leite de búfala integral e diluído em comparação com o leite de vaca integral e tipo C, utilizando ratos como animais de teste, obtendo-se as seguintes conclusões: não houve diferença entre os leites estudados quanto à digestibilidade in vitro; a retenção de cálcio pelos animais, foi superior para a dieta com leite de búfala integral; não houve diferenças significativas para os níveis de triglicerídeos no sangue dos animais; os níveis de colesterol no sangue dos animais foram maiores para as dietas contendo leite de búfala, embora esses níveis sejam considerados dentro da faixa normal para os animais em estudo.; The study of the nutritional value of whole and diluted buffalo milk in relation to whole and standardized cow milk was performed using rats as test animals. The following conclusions were obtained: no differences were observed between buffalo milk regarding in vitro digestibility; a higher calcium retention was exhibited by animals under diet of buffalo whole milk; trygliceride levels were higher in blood of rats under buffalo milk diet, although those values are considered to be normal for these test animals.

Análise química do leite de búfala em comparação ao leite de vaca; Chemical analysis of buffalo milk in relation to cow milk

Verruma, M.R.; Salgado, J.M.
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/04/1994 POR
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Foi estudada a composição química do leite de búfala em relação do leite de vaca. O leite de búfala apresentou níveis de gordura, proteína, sólidos totais, calorias, vitamina A e cálcio mais elevados em relação ao leite de vaca. Os ácidos graxos presentes no leite de búfala em maior concentração foram cápríco, mirístico, palmítico, esteárico, palmitoleico e linoleico e em menor concentração foram os ácidos graxos butírico, e oleico em relação ao leite de vaca.; The chemical composition of buffalo milk was studied in relation to cow milk. The buffalo milk showed higher levels of fat, protein, total solids, calories, vitamin A and calcium in relation to cow milk. The fatty acids present in higher concentration in buffalo milk were capric, myristic, palmitic, stearic, palmitoleic and linoleic and in smaller concentration were butiric, and oleic in relation to the cow milk.

Decrease of intestinal tumors induced by 1,2-dimethylhydrazine in rats fed with cow milk and buffalo milk

Sánchez Negrette,M; Montenegro,M.A.; Catuogno,M.S.; Lértora,W.J.; Guanziroli,M.C.
Fonte: Biocell Publicador: Biocell
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2007 EN
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Epidemiological studies in human beings and experimental studies in laboratory animals suggest that milk and dairy products can inhibit effects on the development of some kinds of tumors. Cow milk contains sphingomyelin, butyric acid, conjugated linoleic acid, calcium, vitamin A, carotene and vitamin D. All of these components are known to inhibit the process of carcinogenesis. Our objective was to determine the effect of cow milk and water buffalo milk on the development of colon neoplasias in an experimental model of carcinogenesis in rats induced with 1,2-dimethylhydrazine (DMH). Three-month-old Wistar male rats with an average body weight of 180 g were given a nutritionally adequate diet and drinking water adlivitum, cow milk or water buffalo milk. The milk diets were provided two weeks before the first DMH treatment and their administration was continued during the 10 weeks of DMH treatment. Milk administration finished two weeks after the last DMH doses treatment. Four months after the last carcinogen injection, all surviving animals were sacrificed and examined for intestinal tumors. The number, size, and location of the tumors were recorded and gross pathology was described. Small tumors (< 2.5 mm) were examined by Scanning Electron Microscopy (SEM). Significantly fewer tumors were observed in both groups treated with DMH and supplemented with milk...

Effects of human milk on blood and bone marrow cells in a malnourished mice model: comparative study with cow milk

García,Isabel; Salva,Susana; Zelaya,Hortensia; Villena,Julio; Agüero,Graciela
Fonte: Nutrición Hospitalaria Publicador: Nutrición Hospitalaria
Tipo: info:eu-repo/semantics/article; journal article; info:eu-repo/semantics/publishedVersion Formato: text/html; application/pdf
Publicado em 01/12/2013 ENG
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Introduction: It has been demonstrated that the alterations caused by nutrient deficiency can be reverted by adequate nutritional repletion. Objective: To perform comparative studies between human and cow milks in order to evaluate the impact of both milks on the recovery of blood and bone marrow cells affected in malnourished mice. Method: Weaned mice were malnourished after consuming a protein free diet for 21 days. Malnourished mice received cow or human milk (CM or HM) for 7 or 14 consecutive days. During the period of administration of milk, the mice consumed the protein free diet ad libitum. The malnourished control (MNC) group received only protein free diet whereas the well-nourished control (WNC) mice consumed the balanced conventional diet. Results and Discussion: Both milks normalized serum albumin levels and improved thymus weight. Human milk was less effective than cow milk to increase body weight and serum transferrin levels. In contrast, human milk was more effective than cow milk to increase the number of leukocytes (WNC: 6.90 ± 1.60ª; MNC: 2.80 ± 0.90b; CM 7d: 3.74 ± 1.10b; HM 7d: 7.16 ± 1.90ª; CM 14d: 4.35 ± 1.20b; HM 14d: 6.75 ± 1.20ª (10(9)/L);p < 0.05) and lymphocytes (WNC: 5.80 ± 0.36ª; MNC: 1.80 ± 0.40b; CM 7d: 2.50 ± 0.30b; HM 7d: 4.20 ± 0.50c; CM 14d: 3.30 ± 0.31d; HM 14d: 4.70 ± 0.28c (10(9)/L);p < 0.05) in peripheral blood. Both milks induced an increment in mitotic pool cells in bone marrow and α-naphthyl butyrate esterase positive cells in peripheral blood. They also normalized phagocytic function in blood neutrophils and oxidative burst in peritoneal cells. Conclusion: Both milks were equally effective to exert favorable effects on the number of the bone marrow cells and the functions of the blood and peritoneal cells involved in immune response. However...

Intramammary infection rate during the dry period in cows that received blanket dry cow therapy: Efficacy of 6 different dry-cow intra-mammary antimicrobial products

Petzer,I-M; Lourens,D C; van der Schans,T J; Watermeyer,J C; van Reenen,R; Rautenbach,G H; Thompson,P
Fonte: Journal of the South African Veterinary Association Publicador: Journal of the South African Veterinary Association
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2009 EN
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The objectives of this study were to compare the efficacy of 6 different dry-cow intra-mammary antimicrobial products for the treatment and prevention of mastitis during the dry period in a well-managed high producing Friesland dairy herd, and the influence of treatment on the somatic cell count (SCC) of cows during early lactation. One of 6 dry-cow intramammary antimicrobial products was randomly allocated to 162 cows due for drying off over a period of 14 months. All cows were sampled twice prior to drying off, and twice after calving for the determination of SCC and presence of microorganisms. The quarter prevalence of pathogens at drying off and post-calving, the overall quarter cure rate and the rate of new intramammary infections occurring during the dry period were determined. The overall quarter prevalence of intramammary infections (IMIs) at drying off was 29.78 % and after calving 22.22 %. There was a statistically significant difference (P < 0.05) between the prevalence of major and minor pathogens at drying off (7.87 % and 21.91 %) and at calving (4.47 % and 17.75 %). The most prevalent pathogens isolated at drying off (21.14 %) and at calving (16.98 %) were coagulase-negative staphylococci (CNS). The quarter cure rate during the dry period was 83.94 %. The cure rate for the major pathogens (98 %) was significantly better (P < 0.05) than that for minor pathogens (78.9 %). The overall quarter cure rate varied from 72.3 % to 93.9 % for the various products. The rate of new quarter infections during the dry period was 17.44 % with a significant difference (P < 0.05)...

Genetic parameters for cow weight at calving and at calf weaning in South African Simmental cattle

Crook,B.J.; Neser,F.W.C.; Bradfield,M.J.
Fonte: South African Journal of Animal Science Publicador: South African Journal of Animal Science
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2010 EN
Relevância na Pesquisa
37.26%
A study was conducted to compare mature cow weight in the South African Simmental population when defined as the weight of the cow at calving or the weight of the cow at weaning of the calf. Data included in the analysis were 14458 records for cow weight at calving (CWT-C) representing 6534 cows and 18871 records for cow weight at weaning (CWT-W) representing 8395 cows. All cows were born between 1968 and 1996, while all calves were born between 1977 and 1998. The following effects had a significant influence on the traits and were included in the genetic analysis: Cow age in years fitted as a covariate term (linear and quadratic) and contemporary group fitted as a fixed effect. Contemporary group was defined as the unique combination of herd, birth year of calf, month of weighing, breeder-defined management group code for the calf and supplementary feeding code for the cow (for CWT-W). All analyses were done using ASREML, first fitting uni-trait and then bi-variate animal models that made provision for up to four weights per cow. The estimated genetic correlation obtained between the two cow weight traits was 0.95 ± 0.03, with a residual correlation of 0.61 ± 0.02. The heritability estimates for CWT-C and CWT-W from this analysis were 0.29 ± 0.04 and 0.37 ± 0.04...