Short communication: Milking order consistency of dairy cows in large Australian herds
Short communication: Milking order consistency of dairy cows in large Australian herds
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DOI：
10.3168/jds.2017-12748
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发表时间：
2018-01-01
影响因子：
3.5
通讯作者：
Fisher, A. D.
中科院分区：
文献类型：
--
作者：
Beggs, D. S.;Jongman, E. C.;Fisher, A. D.
我们使用来自奶牛基础设施的现场记录来检查5个澳大利亚奶牛群在150天内挤奶顺序的一致性，这些奶牛作为一个单独的组为500头以上的奶牛挤奶。在一天内，72%的奶牛挤奶顺序排名位置的差异不到20个百分点。上午和下午挤奶等级位置的相关系数为0.72，奶牛在挤奶顺序开始和结束时的位置比奶牛在挤奶顺序中段的位置更一致。在150天的时间里，挤奶顺序中平均位置在第一和最后20%的奶牛比挤奶顺序中间的奶牛更稳定地保持自己的位置。一个月与下一个月奶牛的挤奶姿势高度相关(r=0.88)。在大型牛群中，奶牛亚群定期在挤奶顺序的开始和结束时挤奶。奶牛通常是作为一组奶牛从围场被收集起来，作为一组在奶牛场等待挤奶，并在挤完奶后立即单独返回围场或饲养场。因此，挤奶顺序较晚的奶牛离开牧场的时间可能比挤奶顺序较早的奶牛多几个小时。这可能会影响它们的福利，因为它们可以躺下的时间不同，吃的牧草不同，在奶牛场站立的时间也不同。
We used on-farm records from dairy infrastructure to examine the consistency of the milking order over 150 d in 5 Australian dairy herds that were milking more than 500 cows as a single group. Within a single day the difference in milking order rank position was less than 20 percentage points for 72% of cows. The correlation coefficient comparing milking rank position in the morning and afternoon was 0.72, with the position of cows at the beginning and end of the milking order being more consistent than cows toward the middle of the milking order. Over a period of 150 d, cows with a mean position in the first and last 20%) of the milking order maintained their position more consistently than cows in the middle of the milking order. Milking position of cows between one month and the next was highly correlated (r = 0.88). In large herds, subpopulations of cows are regularly milked toward the beginning and the end of the milking order. It is common for cows to be collected from the paddock as a group, to wait as a group in the dairy yard to be milked, and to return individually to the paddock or feed pad immediately after they have been milked. Thus, cows milked later in the milking order are likely to be away from the paddock for several hours longer than cows milked earlier in the milking order. This may affect their welfare though differences in time available for lying down, equality of pasture eaten, and time spent standing in the dairy yard.