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  • Title: Association of kappa-casein glycosylation with milk production and composition in Holsteins.
    Author: Robitaille G, Ng-Kwai-Hang KF, Monardes HG.
    Journal: J Dairy Sci; 1991 Oct; 74(10):3314-7. PubMed ID: 1744262.
    Abstract:
    A total of 545 milk samples were collected from 53 Holstein cows for 1 yr. On test day, morning milk yields were recorded; milk samples were analyzed for N-acetylneuraminic acid, protein, fat, casein, kappa-casein, and SCC. the relationship between the degree of glycosylation of kappa-casein and morning milk yield and composition was investigated. Data were analyzed using least squares procedures with a model that included test day, parity, stage of lactation, SCC, and phenotype for kappa-casein as fixed effects and N-acetylneuraminic acid content of kappa-casein as covariate. After adjustments were made for effects of environmental and genetic factors, the degree of glycosylation of kappa-casein was associated with morning milk yield, protein, and casein content. Milk yield increased linearly with an increase of N-acetylneuraminic content up to approximately 70 micrograms/mg of kappa-casein.
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