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中文摘要：
将30头健康的围产期奶牛随机分为三组，分别于产前28d开始饲喂NRC标准日粮（能量摄入100％组或Ⅰ组）、NRC标准增加20％日粮（能量摄入120％组或Ⅱ组）和NRC标准减少20％日粮（能量摄入80％组或Ⅲ组），产后各组奶牛均饲喂NRC标准泌乳日粮，至产后56d结束，观察干奶期不同能量摄入水平对产后奶牛千物质摄入量（DMI）、泌乳量及生殖激素的影响。试验结果表明：围产期生殖激素的剧烈变化影响奶牛的DMI，泌乳量，糖、脂和蛋白质代谢，并主要通过调整NEFA的去路，适应机体的各种生理变化。干乳期能量摄入水平很可能是通过生殖激素对奶牛的DMI、泌乳和能量平衡进行影响和调节的。
英文摘要：
The purpose of this trial was to establish whether there were any differences in the reproductive hormones and performance of dairy cows with energy intake levels in prepartum diets, Thirty of prepartum Holstein cows were randomly allocated into three groups and fed 100% energy diet （NRC standard diets or Ⅰ group）, 120% energy diet （or Ⅱ group） and 80% energy diet （or Ⅲ group）, respectively, beginning at 28 days before parturition. After parturition, all the cows were offered the lactation ration ad libitum until 56 days postpartum. The results indicated that the most critical phase of the Reproductive hormones could accommodate to various kinds of physiological transmutation through regulating of DMI, lactation, glycose metabolism, lipid metabolism and protein metabolism, especially the major metabolic pathways of NEFA（nonesterified fatty acids）. The Energy levels in prepartum diets may be probably acting on accommodating and contributing to the DMI, lactation and energy balance through on regulating of the reproductive hormones of dairy cows.
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