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Effect of Overmilking on Blood Leucocytes in the Subcutaneous Abdominal Vein

Animal Husbandry Research Division, USDA, Beltsville, Maryland 20705

ABSTRACT

Blood samples were obtained from the subcutaneous abdominal vein of 20 cows before and immediately after normal milking, immediately after 15 minutes of overmilking, and 5, 30, and 90 minutes after overmilking. Twenty normally milked controls were sampled before, immediately after, and 5, 30, and 90 minutes after milking. Twenty nonmilked controls were sampled at the same intervals at individually predetermined milking times. At the sampling times leucocyte counts averaged 8,450, 8,050, 7,880, 7,930, 8,240, and 8,280 cells/mm³ for the overmilked; 7,630, 7,340, 7,430, 7,630, and 7,650 cells/mm³ for the normally milked; and 8,100, 8,000, 8,150, 8,140, and 7,960 cells/mm³ for the nonmilked controls. The additional stimulation of overmilking appeared to prolong the decrease in leucocytes caused by normal milking.