Nutritional interactions with reproductive performance in dairy cattle
Nutritional interactions with reproductive performance in dairy cattle
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DOI：
10.1016/s0378-4320(00)00076-2
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发表时间：
2000-07-02
影响因子：
2.2
通讯作者：
Butler, WR
中科院分区：
文献类型：
--
作者：
Butler, WR
产奶能力的提高与哺乳期奶牛生育力的下降有关。产奶后的营养需求随着产奶量的增加而迅速增加，导致能量负平衡(NEBAL)。NEBAL通过抑制黄体生成素的脉冲频率和低水平的血糖、胰岛素和胰岛素样生长因子-I(IGF-I)来延迟第一次排卵的时间，这些因素共同抑制了优势卵泡产生雌激素。促黄体生成素脉冲和外周胰岛素样生长因子-I的上调与内分泌最低点相关，促进排卵。内巴尔可降低血清孕酮浓度和生育力。高粗蛋白日粮支持高产奶量，但也与较低的繁殖性能有关。高蛋白会导致血浆尿素浓度升高，从而影响子宫环境和生育能力。导致高产奶牛繁殖力低下的营养交互作用包括NEBAL的前驱效应和高日粮蛋白质的效应。(C)2000 Elsevier Science B.V.保留所有权利。
Increased capability for milk production has been associated with a decline in fertility of lactating cows. Nutritional requirements increase rapidly with milk production after calving and result in negative energy balance (NEBAL). NEBAL delays the time of first ovulation through inhibition of LH pulse frequency and low levels of blood glucose, insulin and insulin-like growth factor-I (IGF-I) that collectively restrain estrogen production by dominant follicles. Up-regulation of LH pulses and peripheral IGF-I in association with the NEBAL nadir facilitates ovulation. NEBAL reduces serum progesterone concentrations and fertility. Diets high in crude protein support high milk yield, but are also associated with lower reproductive performance. High protein can result in elevated plasma urea concentrations that affect the uterine environment and fertility. Nutritional interactions resulting in poor fertility of high producing dairy cows include the antecedent effects of NEBAL and effects of high dietary protein. (C) 2000 Elsevier Science B.V. All rights reserved.