Low colostrum yield in Jersey cattle and potential risk factors
Low colostrum yield in Jersey cattle and potential risk factors
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DOI：
10.3168/jds.2017-14308
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发表时间：
2018-07-01
影响因子：
3.5
通讯作者：
Moore, D. A.
中科院分区：
文献类型：
--
作者：
Gavin, K.;Neibergs, H.;Moore, D. A.
食用足够量的高质量初乳对奶牛的生存能力和成为生产性畜群成员至关重要。然而，一些奶牛群报告了牛在秋季和冬季的初乳产量不足，范围从低量到不产初乳。关于这一现象的资料很少。本研究的目的是描述综合征的特征，并确定低初乳产量的潜在危险因素。2016年5月，一个2,500头奶牛的泽西奶牛场参加了一项前瞻性队列研究，以评估光周期、温度和奶牛因素对初乳产量的可能影响。对乳品工作人员进行了收集、称重和评估初乳质量的培训。通过法恩奶牛场管理软件收集胎次、前泌乳期长度、前305日龄等效产奶量和干奶期长度等信息。还收集了天气和光周期数据。在入组当年，2，988头合格母牛产犊并记录了初乳重量，38%为经产母牛（n = 1，143），25%处于第二次泌乳期（n = 752），37%处于第三次或更长时间的泌乳期（n = 1，093）。2016年6月的总体平均初乳产量为6.6 kg/头，2016年12月为2.5 kg/头，2017年5月为4.8 kg/头。与经产动物（6.5至4.2 kg/奶牛）相比，经产奶牛在6月至12月期间的初乳产量下降幅度更大（6.6至1.3 kg/奶牛）。总体而言，在此期间，平均初乳产量每周减少0.17 kg/奶牛，经产奶牛减少0.22 kg，经产奶牛减少0.08 kg。为所有奶牛构建逻辑回归模型，以评估奶牛因素对低初乳产量（第一次挤奶时< 2.7 kg）的影响。干乳期长度、小牛性别、单胎或双胎、泌乳年龄、产犊月份和先前泌乳时间与低初乳产量的概率显著相关（
Consumption of an adequate volume of high-quality colostrum is vital to a dairy calf's ability to survive and become a productive herd member. However, some dairy herds have reported a deficiency of colostrum production, which ranges from a low volume to no colostrum produced, by cows during fall and winter. Little information regarding this phenomenon exists. The purpose of this study was to characterize the syndrome and identify potential risk factors for low colostrum yield. A 2,500-cow Jersey dairy farm was enrolled in a prospective cohort study in May 2016, to evaluate possible effects of photoperiod, temperature, and cow factors on colostrum production. Dairy personnel were trained to collect, weigh, and evaluate colostrum quality. Information on parity, previous lactation length, previous 305-d mature-equivalent milk production, and dry period length were collected through the farrn's dairy management software. Weather and photoperiod data were also collected. Over the year of enrollment, 2,988 eligible cows calved and had colostrum weights recorded and 38% were primiparous (n = 1,143), 25% were in their second lactation (n = 752), and 37% were in their third or greater lactation (n = 1,093). The overall average colostrum yield was 6.6 kg/cow in June 2016, 2.5 kg/cow in December 2016, and 4.8 kg/cow in May 2017. Multiparous cows had a larger decline in colostrum production between June and December (6.6 to 1.3 kg/cow) compared with primiparous animals (6.5 to 4.2 kg/cow). Overall, average colostrum production decreased by 0.17 kg/cow per week during this time, 0.22 kg for multiparous cows and 0.08 kg for primiparous cows. A logistic regression model was constructed for all cows to evaluate effects of cow factors on low colostrum production (< 2.7 kg at first milking). Dry period length, calf sex, singleton or twin, age at freshening, month of calving and previous lactation length were significantly associated with the probability of low colostrum yield (