Abstract
Summary Sixty-three Holstein cows were utilized to determine the effects of lactation on blood serum total protein, urea nitrogen, albumin, globulin, and the albumin to globulin ratio. Sampling consisted of monthly blood collections starting with the onset of lactation and continuing to the dry period. Blood values obtained were statistically analyzed by linear regression on lactation number, month of calving, month of lactation at conception, stage of lactation, milk yield, and milk fat yield. Serum total protein was influenced by all lactation parameters examined except milk fat yield. Circulating blood urea nitrogen levels varied with lactation number, month of calving, stage of lactation, and milk yield. Levels of serum albumin were influenced by month of calving. Serum globulin and the albumin to globulin ratio were influenced by all lactation parameters examined except milk and milk fat yield.
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