期刊
ANIMAL FEED SCIENCE AND TECHNOLOGY
卷 261, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.anifeedsci.2019.114384
关键词
Acacia mearnsii; Ammonia; Gluconeogenesis; Liver; Sheep; Ureagenesis
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, Brazil)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES, Brazil)
This study was conducted to quantify the impact of the dietary inclusion of Acacia mearnsii bark extract (TA), a tannin extract, on total tract digestibility and on ammonia, urea and glucose splanchnic net flux in sheep. The trial was conducted with five Texel male sheep (48 +/- 3.2 kg body weight (BW)) surgically implanted with chronic indwelling catheters into one mesenteric, portal and hepatic veins, in two 21-day periods, in a cross-over design. Diet was oat/ryegrass hay, offered ad libitum, plus concentrate offered three times per day at a rate of 14 g/kg BW. The concentrate, composed of soybean meal, cracked corn and wheat bran, included (Tannin) or not (Control) 20 g/kg dry matter (DM) of TA. Plasma flow and net flux through portal-drained viscera (PDV), liver and total splanchnic tissues (ST) were measured using four hourly samples, from 14:00 to 17:00, after the 12:00 meal. Total TA concentration in diet of TA treatment averaged 7.7 g/kg DM. The organic matter (OM) intake and digestibility were not affected by TA. The nitrogen (N) intake and fecal excretion, the estimated rumen microbial N flow to the small intestine and the efficiency of microbial protein synthesis (EMPS) were not affected whereas the digestibility of N compounds and the urinary excretion of urea-N were lower (P < 0.05) in TA treatment. There was no significant effect of TA on the net flux of ammonia, urea-N or glucose across PDV, liver and total ST. In conclusion, the dietary inclusion of tannin extract from Acacia meanrsii at a rate of 7.7 g/kg DM decreased the urinary excretion of urea with, however, no impact on ammonia, urea or glucose net flux across ST.
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