Influence of Energy Supplementation on Nitrogen Kinetics in the Rumen and Urea Metabolism

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X

Firstly, this paper reviewed the effects of supplementary energy supply on nitrogen utilization, nitrogen kinetics in the rumen and urea metabolism in ruminants. Improving the utilization of dietary nitrogen by increasing microbial yield is possible through energy supplementation, but the type of supplement and level of intake required differ between diets. Secondly, the effects of sucrose supplementation on rumen fermentation and nitrogen kinetics were examined in sheep fed freshly cut lucerne, lucerne chaff and hay cubes. In this experiment, the method of isotope dilution of 14C-urea, 15N-urea, 3H-glucose and 15N-ammonium salt was used for the estimation of parameters of metabolism. Supplementation with sucrose decreased the urinary N excretion, resulting in an increase in N retention. Supplementation with sucrose resulted in a lower rumen ammonia and plasma urea concentration. The fermentation of sucrose in the rumen resulted in a decrease in rumen pH and in the ratio of acetate to propionate. Sucrose supplementation increased the proportion of urea transferred to the rumen, the non-ammonia N (NAN) concentration in the rumen and the NAN flow from the rumen to the lower digestive tract. Urinary allantoin excretion rate increased with sucrose supplementation. The plasma glucose concentration did not change but the plasma insulin concentration increased with sucrose supplementation. The influence of an energy-rich supplement on the utilization of N and N kinetics in the rumen and whole body of domestic ruminants is discussed.

作成者 Yoshiaki OBARA David Williams DELLOW
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 143
終了ページ 149
言語 eng