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Effect of ß-Lactoglobulin Variant and Environmental Factors on Variation in the Detailed Composition of Bovine Milk Serum Proteins

Department of Animal Science, Macdonald College of McGill University, 21,111 Lakeshore Road, Ste. Anne de Bellevue, Quebec, Canada H9X 1CO

ABSTRACT

Between November 1979 and November 1981, 17,086 test-day milk samples were collected from individual Holstein cows in 62 Quebec herds. Samples were analyzed for protein, fat, casein, serum protein, somatic cell count, and the relative percentages of ß-lactoglobulin, -lactalbumin, bovine serum albumin, and the immunoglobulins. Cows included in the study were phenotyped with respect to ß-lactoglobulin. Unadjusted means ± standard error for the relative percentages of ß-lactoglobulin, -lactalbumin, bovine serum albumin, and immunoglobulins were 64.80 ± .07%, 21.54 ± .05%, 6.51 ± .02%, and 7.15 ± .04%. Least-square analyses showed that month of test, stage of lactation, age of cow, somatic cell count, and phenotype of the cow for ß-lactoglobulin had significant effects on the relative percentages of ß-lactoglobulin, -lactalbumin, bovine serum albumin, and immunoglobulins. Test-day milk yield, fat percent, protein percent, casein percent, casein number, and serum protein percent, when included in a statistical model as covariates, had a significant effect on the relative percentage of Ig. Relative proportion of ß-lactoglobulin and -lactalbuminim were not significantly affected by serum protein and total protein contents. For bovine serum albumin, only the covariates fat percent and serum protein percent were not significant.

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