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Relationship of Blood Serum Protein and Protein Fractions to Milk Constituents and Temperature-Season

Department of Dairy Science and Experimental Statistics, Louisiana State University, Baton Rouge 70803

ABSTRACT

Blood serum protein and protein fractions were determined in 265 samples from 62 lactating Holstein cows over one calendar year. Temperature-seasonal changes (cool, optimum, hot) were responsible for significant linear and quadratic fluctuation in serum protein fractions. Serum albumin, ß-globulin, ₂- globulin, and the A:G ratio significantly decreased as seasons progressed from cool to hot. Further, globulin and -globulin both increased significantly from cool to hot seasons. An a1bumin:globulin ratio (.56:1) was inverted.

Milk fat percentage was positively correlated with serum albumin percentage and a1bumin:globulin ratio and negatively correlated with total serum protein, and serum globulin and -globulin percentages. No correlations were significant between Wisconsin Mastitis Test or Direct Microscopic Somatic Cell Count and any of the serum protein constituents or total serum protein. Monthly 4% fat-corrected milk was negatively correlated with total serum protein and serum globulin percentage and positively correlated with serum ₂-globulin percentage.