alexa Composition of milks of dairy cattle. I. Protein, lactose, and fat contents and distribution of protein fraction.
Psychiatry

Psychiatry

Journal of Addiction Research & Therapy

Author(s): Cerbulis J, Farrell HM Jr

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Abstract Milks from commercial dairy herds in Southeastern Pennsylvania were analyzed for total protein, casein, whey protein, beta-lactoglobulin, nonprotein nitrogen, and lactose contents. Data for fat contents and milk yields were from Dairy Herd Improvement Association records for the same lactation. Milk samples were from a single milking of healthy cows (151) in midlactation. Since the remainder of the milk was returned to the bulk milk of the farm, the data represent market milk composition. The data were grouped and analyzed by breed and beta-lactoglobulin phenotype; there were 18 to 33 cows per breed. In true protein percentage, the breeds ranked: Jersey 4.07 plus or minus .49, Brown Swiss 3.84 plus or minus .47, Guernsey 3.56 plus or minus .53, Ayrshire 3.30 plus or minus .52, Milking Shorthorn 3.17 plus or minus .47, Holstein 3.07 plus or minus .43. Breeds differed in all other components and in milk yield. Brown Swiss ranked highest in yield of protein. Only whey protein and beta-lactoglobulin contents were influenced by the beta-lactoglobulin genotype with beta-lactoglobulin A greater than AB greater than B in whey protein content. This article was published in J Dairy Sci and referenced in Journal of Addiction Research & Therapy

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