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Variation in milk whey composition throughout lactation in cows of different beta-lactoglobulin phenotypes



Variation in milk whey composition throughout lactation in cows of different beta-lactoglobulin phenotypes



Proceedings of the New Zealand Society of Animal Production 58(0): 52-54



The association between beta-lactoglobulin (beta-LG) variants and milk composition throughout lactation was determined by sampling from 44 Friesian cows (22 homozygous for beta-LG AA and 22 homozygous for beta-LG BB) in early (day 6 postpartum), established (1-3 months postpartum) and late lactation (on the day of drying off). Results indicated that differences between beta-LG AA and BB phenotype milk (expressed as a percentage of the level in phenotype AA) in concentrations of bovine serum albumin (BSA; - 15.9%, -32.0%, -42.5%) and beta-LG (5.9%,16.0%,32.2%), in early, established and late lactation respectively, increased steadily as lactation progressed. The differences in alpha-lactalbumin concentrations were less variable (1.2%, -9.0%, -9.1%). These results provide new evidence that compositional differences are not seen between beta-LG AA and BB phenotype milk until established lactation.

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Accession: 009716733

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