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首页> 外文会议>Conference of the New Zealand Society of Animal Production >Phenotypic correlations of milk urea and the efficiency of crude protein utilization with milk yield traits and cow performance in two contrasting dairy systems in New Zealand
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Phenotypic correlations of milk urea and the efficiency of crude protein utilization with milk yield traits and cow performance in two contrasting dairy systems in New Zealand

机译：新西兰两种对比乳制品中牛奶尿素的表型相关性及粗蛋白质利用效率及牛绩效

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摘要

The objectives of the present study were to investigate phenotypic correlations of milk urea (MU) and efficiency of crude protein utilization (ECPU) with milk production and cow parameters in two contrasting herds. Between July 2016 and May 2017, 210cows were milked twice daily with high supplementary feed inclusion (HS) and 258 cows were milked once daily with low supplementary feed inclusion (LS). In early, mid and late lactation, milk samples were collected to measure MU. At every herd-test date,ECPU was calculated as protein yield (PY) divided by crude protein intake (CPI); this last variable derived from intake estimations of metabolizable energy requirements. Positive correlations between milk yield (MY) and both dry matter intake (DMI) andCPI were observed in LS and HS. The ECPU only correlated positively with MY traits in LS, and there was no correlation of CPI with MU in either herd. A moderate negative correlation of ECPU with live weight (LW) was observed in both herds, but it was stronger in LS. By suppressing MY due to the reduced milking frequency of cows fed LS, these cows gained LW, had higher body condition score and CPI, and lower PY, reducing the ECPU. No correlation between ECPU and MU was detected.
机译：本研究的目的是探讨牛奶尿素（MU）和粗蛋白利用效率（ECPU）的表型相关性，并在两个对比的牛奶中与牛奶生产和牛参数。 2016年7月至2017年5月，每天210分钟挤奶两次，含有高补充饲料包容（HS），每日挤出258奶牛，用低补充饲料夹杂物（LS）。早期，中期和晚期哺乳期，收集牛奶样品以测量亩。在每个畜群测试日期，ECPU被计算为蛋白质产量（PY）除以粗蛋白摄入量（CPI）;该最后变量导出从可代谢能量需求的摄入量估计。在LS和HS中观察到牛奶产量（我的）和干物质摄入（DMI）和CPI之间的正相关性。 ECPU仅与我的LS中的特征正相关，CPI在任何一种畜群中都没有相关的CPI。在两只畜群中观察到ECPU与活体重（LW）的适度负相关，但它在LS中更强大。通过抑制我的奶牛的挤奶频率降低，这些牛获得了LW，具有更高的身体状况得分和CPI，以及降低PY，减少了ECPU。未检测到ECPU和MU之间的相关性。

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