Página 1 dos resultados de 135 itens digitais encontrados em 0.003 segundos
Resultados filtrados por Publicador: Elsevier

Feeding quebracho tannins to sheep enhances rumen fermentative activity to degrade browse shrubs

Ammar, H.; López, Secundino; Kammoun, M.; Bodas, Raúl; Giráldez, Francisco Javier; González, Jesús Salvador
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 94510 bytes; application/pdf
ENG
Relevância na Pesquisa
27.47%
15 pages, 4 tables.-- Available online May 23, 2008.; Twenty-four samples of leaves, flowers and fruits of five browse plant species (i.e., Erica australis; Cistus laurifolius; Quercus pyrenaica; Cytisus scoparius and Rosa canina) collected from spring to autumn at uplands in the province of León (NW Spain) were used to explore medium-term effects of intake of quebracho condensed tannins on fermentative activity in the rumen of sheep. The objective was to determine if adaptation to tannins at the rumen level may develop in response to regular consumption of tannins, resulting in an enhanced ability to digest browse forages. Eight rumen cannulated Merino sheep fed chopped alfalfa hay were used. Four sheep were fed alfalfa hay supplemented with 50 g quebracho/kg dry matter (DM) for 60 days and used as the treated group (QT sheep), whereas the other sheep were always fed untreated alfalfa hay and used as the control group. Differences in the fermentative activity were examined in vitro (DM digestibility (IVD) and gas production kinetics) in batch cultures inoculated with rumen fluid obtained on day 60 from both groups of sheep. With most browse samples, incubation in rumen fluid from QT sheep resulted in higher IVD, gas production at 24 h...

Intoxication of sheep with quebracho tannin extract

Hervás, Gonzalo; Pérez Pérez, Valentín; Giráldez, Francisco Javier; Mantecón, Ángel R.; Almar, M. M.; Frutos, Pilar
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 94510 bytes; application/pdf
ENG
Relevância na Pesquisa
37.88%
11 pages, 4 figures, 3 tables.-- PMID: 12859907 [PubMed].-- Printed version published Jul 2003.; This experiment was carried out to study the toxicity of quebracho tannin extract (containing 760 g of condensed tannins [CTs] per kg), with the aim of validating its use as a feed additive for improving the digestive utilization of protein-rich feeds. Four groups (Q(0), Q(1), Q(2) and Q(3)) of four sheep were dosed intra-ruminally once daily, for up to 21 days with, respectively, 0, 0.5, 1.5 or 3.0 g quebracho tannin extract/kg live-weight (LW). Feed intake, live-weight changes, plasma biochemistry, indicators of hepatic detoxification function, gross lesions and histopathology were examined. Animals in groups Q(0), Q(1) and Q(2) consumed all the offered feed. In contrast, feed intake was practically nil after 6 days of quebracho dosing in group Q(3), this being associated with a loss of 4.7+/-1.30 kg LW in 10 days (P<0.05). Sheep from groups Q(0), Q(1) and Q(2) remained healthy throughout the experiment. Ewes from group Q(3) became weak and depressed on day 5 and after 8 days of dosing remained recumbent. They were humanely killed after 10 days to avoid suffering. In general, neither gross lesions nor microscopical changes were observed in animals from groups Q(0)...

Effect of different doses of quebracho tannins extract on rumen fermentation in ewes

Hervás, Gonzalo; Frutos, Pilar; Giráldez, Francisco Javier; Mantecón, Ángel R.; Álvarez del Pino, María C.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 94510 bytes; application/pdf
ENG
Relevância na Pesquisa
37.88%
14 pages, 1 figure, 5 tables.-- Available online Aug 23, 2003.; Previously published as proceeding at the XXXIII Jornadas de Estudio AIDA (IX Jornadas sobre Producción Animal). ITEA Vol. Extra 22 (Zaragoza, Spain, Apr 25-27, 2001). https://digital.csic.es/handle/10261/14343; Sixteen Merino ewes, fitted with ruminal cannulae, were divided into four groups of four, with the aim of studying effects of different doses of quebracho tannins on rumen fermentation in sheep. Zero (control, Q0), 0.5 (Q1), 1.5 (Q2) and 3.0 g (Q3) of quebracho tannins extract (containing 76% condensed tannins (CTs)) per kg LW per day (equivalent to 0, 28, 83 and 166 g/kg DM (dry matter) feed, respectively) were intra-ruminally administered, for up to 21 days. The rumen in sacco technique was used to examine in situ DM, crude protein (CP), neutral-detergent fibre (NDF) and acid-detergent fibre (ADF) disappearances, and a gas production method was used to examine rate and extent of in vitro gas production and in vitro dry matter disappearance (ivDMD). Alfalfa hay (AH), barley straw (BS) and Erica arborea (EA) were used in all the incubations. In vivo pH and ammonia-N and volatile fatty acid concentrations were also measured. Ewes from groups Q0, Q1 and Q2 remained healthy throughout the experiment and consumed the entire ration offered. However...