Net flux of metabolites across the ruminal wall of sheep fed twice a day with orchardgrass hay
| Autor: | JP Chaise, E. Delval, Didier Rémond, Claude Poncet |
|---|---|
| Přispěvatelé: | Station de recherches sur la nutrition des herbivores, Institut National de la Recherche Agronomique (INRA) |
| Rok vydání: | 1993 |
| Předmět: |
Male
Rumen Butyrate Poaceae Absorption Veins Hemoglobins 03 medical and health sciences Ammonia chemistry.chemical_compound Animal science Genetics Animals Urea ComputingMilieux_MISCELLANEOUS 030304 developmental biology Morning 2. Zero hunger chemistry.chemical_classification 0303 health sciences Meal Sheep Osmolar Concentration 0402 animal and dairy science Arteries 04 agricultural and veterinary sciences General Medicine Hydrogen-Ion Concentration Fatty Acids Volatile Animal Feed Urease 040201 dairy & animal science chemistry Agronomy Regional Blood Flow [SDV.SA.SPA]Life Sciences [q-bio]/Agricultural sciences/Animal production studies Hay Propionate Animal Science and Zoology Food Science |
| Zdroj: | Journal of Animal Science Journal of Animal Science, American Society of Animal Science, 1993, 71 (9), pp.2529-2538 |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.2527/1993.7192529x |
| Popis: | Four Texel wethers (68 +/- 2.5 kg BW) fitted with catheters in the ruminal veins and a mesenteric artery, blood flow probes around ruminal arteries, and a ruminal cannula were used to determine meal-related variations and daily significance of net flux across the ruminal wall of urea and ammonia (NH3), VFA, D-beta-hydroxybutyrate (D beta HOB), lactate, and glucose. Sheep were fed every 12 h with orchardgrass hay (430 g of DM/meal; 611 g of digestible OM/kg of DM and 23.6 g of N/kg of DM). Apart from lactate and glucose, the fluxes of studied metabolites were significantly affected by time after morning feeding. Maximum absorption of VFA and NH3 were observed at the end of the meal; however, 5 h after the meal VFA absorption was still high, whereas NH3 absorption had decreased to the prefeeding level. Net release of D beta HOB was greater during the 2 h after the meal than during the rest of the time. Urea net transfer decreased during the meal, and thereafter it increased to the 5th h after feeding, at which time it was twofold higher than at prefeeding. The difference in net flux across the ruminal wall of urea and NH3 was linearly correlated with NH3 concentration in the ruminal fluid. Daily urea and NH3 net transfer were -2.10 and 3.76 g of N/d, respectively. The VFA net appearance in the ruminal veins was 1.167, .226, and .014 mol/d for acetate, propionate, and butyrate, respectively. Daily net release of D beta HOB, lactate, and glucose by the rumen wall was .153, .093, and -.012 mol/d, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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