EFFECT OF SELECTION FOR MILK AND TOTAL MILK SOLIDS ON BUTTERFAT, SOLIDS-NOT-FAT, AND PROTEIN IN MILK FROM DAIRY CATTLE

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Abstract
Production data from five Holstein, six Ayrshire, and three Jersey herds were analysed to give the expected effects of milk and total milk solids selection on milk quality as measured by per cent butterfat, solids-not-fat, and protein. Progeny tests were conducted at 11 locations under total digestible nutrient controlled, year-round stable feeding conditions.With varying breeding values for total milk solids yield, there was no definite trend between quality and quantity for Holsteins and Ayrshires, but in Jerseys quality showed a definite downward trend with increasing quantity.For milk yield breeding values the same applied except that protein percentage in Holsteins also showed a downward trend with increasing quantity.

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