Zinn S A, Gorewit R C, Sagi R
J Dairy Sci. 1982 Apr;65(4):668-71. doi: 10.3168/jds.S0022-0302(82)82247-9.
Milk yield, machine-on time, peak milk flow rate, average milk flow rate, and milk composition were measured in 10 Holstein Friesian cows after receiving no premilking stimulation (i.e., teat cups attached to the udder without premilking washing or teat manipulation) and manual premilking stimulation (30 s udder and teat massage and withdrawal of a few squirts of milk followed by a 30 s delay) at approximately 100, 160, 220, and 280 days postpartum. Milk yield was not different for cows milked with premilking stimulation as compared with cows receiving no premilking stimulation at each stage of the trial. Machine-on time was consistently shorter for cows receiving premilking stimulation. Peak milk flow rate and average flow rate were also uniformly greater in cows receiving premilking stimulation. Milk fat yields were always slightly higher for cows given premilking stimulation compared with those receiving no premilking stimulation. Protein yields did not differ between treatments at any lactational state. Differences in machine-on time and certain milk flow variables are congruent between cows given premilking manual massage and no premilking stimulation during short trials at specific stages of lactation.
在10头荷斯坦奶牛产后约100、160、220和280天时，测量了在未进行挤奶前刺激（即不进行挤奶前清洗或乳头操作，直接将奶杯连接到乳房）和手动挤奶前刺激（30秒的乳房和乳头按摩，挤出少量乳汁后延迟30秒）两种情况下的产奶量、机器运行时间、峰值奶流速、平均奶流速和乳汁成分。在试验的每个阶段，接受挤奶前刺激的奶牛与未接受挤奶前刺激的奶牛相比，产奶量没有差异。接受挤奶前刺激的奶牛的机器运行时间始终较短。接受挤奶前刺激的奶牛的峰值奶流速和平均流速也始终较高。与未接受挤奶前刺激的奶牛相比，接受挤奶前刺激的奶牛的乳脂产量总是略高。在任何泌乳状态下，不同处理之间的蛋白质产量没有差异。在泌乳特定阶段的短期试验中，接受挤奶前手动按摩的奶牛与未接受挤奶前刺激的奶牛相比，机器运行时间和某些奶流变量的差异是一致的。
