Krawczel P, Ferneborg S, Wiking L, Dalsgaard T K, Gregersen S, Black R, Larsen T, Agenäs S, Svennersten-Sjaunja K, Ternman E
Department of Animal Science, University of Tennessee, 2506 River Drive, 258 Brehm Animal Science Bldg., Knoxville 37996.
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, PO Box 7024, 750 07 Uppsala, Sweden.
J Dairy Sci. 2017 Aug;100(8):6640-6647. doi: 10.3168/jds.2016-12312. Epub 2017 Jun 7.
Increasing the milk flow rate at which milking is terminated can shorten milking time and increase milking efficiency. The effects on milk yield and composition have not been fully investigated when the take-off is set at the udder quarter level and independent of feeding during milking. The objective of this study was to investigate the effect of 3 take-off levels at the udder quarter level (0.06, 0.3, and 0.48 kg/min) applied with or without feeding during milking on milking time, milk yield, the degree of udder emptying, milk composition, and free fatty acids. In this study, 30 cows were allocated into 6 groups, balanced by lactation number, lactation stage, and milk yield, and subjected to a 3 × 2 factorial arrangement of treatments using a Latin square design. Treatments were applied for 1 wk each. This study demonstrated milking time could be reduced by applying up to a take-off level of 0.48 kg/min on udder quarter level without losing milk yield or compromising milk composition or udder health.
提高挤奶结束时的牛奶流速可以缩短挤奶时间并提高挤奶效率。当在乳房象限水平设置取奶量且与挤奶期间的饲喂无关时，对产奶量和乳成分的影响尚未得到充分研究。本研究的目的是调查在乳房象限水平上3个取奶量水平（0.06、0.3和0.48千克/分钟）在挤奶期间有或没有饲喂的情况下对挤奶时间、产奶量、乳房排空程度、乳成分和游离脂肪酸的影响。在本研究中，30头奶牛被分为6组，按胎次、泌乳阶段和产奶量进行平衡，并采用拉丁方设计进行3×2析因处理安排。每个处理应用1周。本研究表明，在乳房象限水平上应用高达0.48千克/分钟的取奶量水平可以减少挤奶时间，而不会损失产奶量或损害乳成分或乳房健康。
