摘要

及时提供DL??乳品企业的不同饲料:一种昼夜科学

作者(年代):阿克巴时

这篇文章的目的是要说明提供dL??在24小时内适当的时间向奶牛反刍动物提供不同的饲料成分，特别是粗饲料和精料。而dL的specLficDOO\ unexploring ??erLnJ饲料成分中，进食时间已经被发现是营养摄入昼夜节律、瘤胃发酵和中间代谢的关键调节因子[1-4]。本文提出了一个基于dL??不同的饲料项目，特别是一般的粗饲料和精料都有最佳供应时间。最近的研究表明，与每天早上饲喂一次全混合口粮的奶牛相比，饲喂后不久采食量和瘤胃挥发性脂肪酸和氨浓度的增加更明显[5,6]。结果表明，夜间喂养的奶牛外周血关键代谢产物sLJnLficDntO\水平比早晨喂养的奶牛更高[6]。然而，这种产酸峰值的增加和瘤胃pH值的降低并不影响瘤胃功能和乳制品产量。值得注意的是，夜间喂养比日间喂养增加了乳汁能量产量和某些情况下的采食量[6]。 ?ese findLnJs suggest that rumen and the whole ruminant can e???ectLveO\ tolerate increased fluctuDtLons in metabolism nocturnally. ?Ls suggestion founds a theory that those ingredients that are considered more risky to rumen and ruminant health should have optimal times of provision during the 24-h period. Based on recent findLnJs [7,8], rumen experiences a greater volume and fermentation rate and extent overnight vs. during day. ?Ls suggests that rumen physiology and metabolism do function under specialized circadian rhythms. Synchronizing such rhythms with the external environment including feeding timing and photoperiod should enable optimizing nutrient use e?cLenc\ and dairy farm economics. Future research on the above synchronies is a must before global guidelines on optimal circadian times of the provision of specLfic feed ingredients may be formulated.