Halbouche M, Brun-Bellut J
Laboratoire science animale INRA-ENSAIA, Vandoeuvre, France.
Reprod Nutr Dev. 1995;35(1):105-16.
Limited feeding effects (75% of ad libitum) were studied in 3 adult dry goats. Their diet was composed of dried beet pulps (1/3 DM), dried alfalfa (1/3 DM) and hay (1/3 DM). The CP content was 11.9% DM. Rumen fermented OM was decreased by 243 g.d-1, but rumen pH and ammonia content remained the same. Rumen bacteria synthesis efficiency was decreased (-4%), but the value (151 g crude bacteria protein.kg-1 DOM) was higher than conventional values used in PDI and NRC systems. Nitrogen rumen balance (duodenal N-N intake) was lower (-1.9 g.d-1) with restricted goats. This could be related to the increase in urinary urea excretion (+0.4 gN.d-1). There was no significant effect of the limiting feeding on total OM and N digestibilities. The disappearance rate of OM in the rumen and the small intestine tended to be higher (+4 and +8%, respectively) in the restricted animals. Nitrogen retention was lower (-5.7 g.d-1) in restricted goats. Only 59 (or 56%) of the duodenal nitrogen was protein. Their digestibility in the small gut was higher (+8 pts) than NPN digestibility. A total of 86% of duodenal RNA disappeared in the small gut but less than 60% of DAPA was digested in this part.
在3只成年干奶山羊中研究了限量采食（自由采食的75%）的效果。它们的日粮由干甜菜粕（1/3干物质）、干苜蓿（1/3干物质）和干草（1/3干物质）组成。粗蛋白含量为11.9%干物质。瘤胃发酵有机物减少了243克/天，但瘤胃pH值和氨含量保持不变。瘤胃细菌合成效率降低了（-4%），但其值（151克粗细菌蛋白/千克可消化有机物质）高于PDI和NRC系统中使用的常规值。限饲山羊的氮瘤胃平衡（十二指肠氮摄入量）较低（-1.9克/天）。这可能与尿尿素排泄增加（+0.4克氮/天）有关。限饲对总有机物和氮消化率没有显著影响。限饲动物瘤胃和小肠中有机物的消失率趋于更高（分别提高4%和8%）。限饲山羊的氮保留量较低（-5.7克/天）。十二指肠氮中只有59（或56%）是蛋白质。它们在小肠中的消化率比非蛋白氮消化率高（高8个百分点）。十二指肠RNA总量的86%在小肠中消失，但二氨基嘌呤在这部分的消化率不到60%。
