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Effects of environmental factors and milk protein polymorphism on composition of casein fraction in bovine milk



Effects of environmental factors and milk protein polymorphism on composition of casein fraction in bovine milk



Journal of Dairy Science 68(7): 1752-1757



Test-day samples were collected from individual Holstein cows in 62 herds enrolled in the Quebec [Canada] Dairy Herd analysis Service. Samples were analyzed for protein, fat, casein and serum protein content, somatic cell count and relative percentages of .alpha.2-, .beta.- and .kappa.-casein and .alpha.-lactalbumin. Cows included in the study were phenotyped for the genetic variants of .alpha.s1-, .beta.- and .kappa.-casein. Unadjusted means for relative percentages of .alpha.s-, .beta. and .kappa.-casein were 59.85, 31.23 and 8.93%, respectively. Least-squares analyses showed that month of test, stage of lactation, age of the cow somatic cell count and phenotype of the cow for .beta.-casein contribution to variations in the relative percentages of .alpha.s- and .beta.-casein. Month of test, somatic cell count and phenotype of the cow for .kappa.-casein also had a significant effect on the relative percentage of .kappa.-casein. When test-day milk yield, percentage of fat, protein, casein and serum protein, casein to protein ratio and relative percentage of .alpha.-lactalbumin were included in the model as covariates, only casein percentage did not have a significant effect on the relative percentages of .alpha.s- and .beta.-casein. For .kappa.-casein, only fat percent was significant.

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Accession: 001352537

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DOI: 10.3168/jds.S0022-0302(85)81023-7


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