Study on the Effect of Parity on Milk Letdown Time in Mehsana Buffaloes

H. A. Patel, Amit Kumar Srivastava, H. D. Chauhan, J. B. Patel
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Abstract

An experiment was conducted to study the effect of parity on milk let-down time in Mehsana buffaloes. Twenty four Mehsana buffaloes were divided into four groups on the basis of parity (1-4 lactation) and maintained under uniform feeding and housing conditions. Data on letdown time for different parity buffaloes were collected six days in a month at morning and evening milking for six months. The average letdown time was more in evening milking for the month of August, September, November and January, while it was more in morning in the month of October and December and the difference was not-significant. The average letdown time for Mehsana buffaloes in Lactation-I (L1), Lactation-II (L2), Lactation-III (L3) and Lactation-IV (L4) was 71.15, 69.22, 62.30 and 56.65 sec., respectively, with overall average of 64.83 sec. The differences were significant (P<0.01) among lactation. Decreasing trend was observed for letdown time with increasing number of parity. The average letdown time was more during morning milking (65.58 sec) than evening (64.09 sec.) however the difference was not-significant. It may be concluded that the average time required for letdown decreases as the parity advances in the Mehsana buffaloes. Hence, first time calvers should be given teat manipulation before calving and pre-milking udder stimulation must be introduced as milking routine.
胎次对梅哈萨纳水牛泌乳时间影响的研究
本试验研究了胎次对梅哈萨纳水牛排乳时间的影响。选取24头梅哈萨纳水牛,按胎次(1-4泌乳)分为4组,饲养和圈养条件均匀。收集不同胎次水牛每月6天的早晚挤奶时间数据,历时6个月。8月、9月、11月和1月的平均放奶时间以晚间较多,10月和12月的平均放奶时间以早晨较多,差异不显著。泌乳期ⅰ(L1)、泌乳期ⅱ(L2)、泌乳期ⅲ(L3)和泌乳期ⅳ(L4)的平均失速时间分别为71.15、69.22、62.30和56.65秒,总体平均失速时间为64.83秒,各泌乳期差异均显著(P<0.01)。随着奇偶数的增加,降速时间呈减小趋势。平均失望时间上午(65.58秒)比晚上(64.09秒)长,但差异不显著。可以得出这样的结论:在梅哈萨纳水牛中,随着胎次的增加,平均下潜所需的时间也在减少。因此,首次产犊的奶牛应在产犊前进行乳房操作,并在产奶前进行乳房刺激。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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