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Studies on ad libitum feeding for dairy cows. III. The effect of the protein content of diets for high-yielding cows in early lactation on intake, milk production, weight change, rumen parameters, and blood plasma characteristics



Studies on ad libitum feeding for dairy cows. III. The effect of the protein content of diets for high-yielding cows in early lactation on intake, milk production, weight change, rumen parameters, and blood plasma characteristics



Research Bulletin of the Aichi ken Agricultural Research Center (16): 317-324



In wk 2-15 after calving, 9 high-yielding Holstein-Friesian cows (daily milk yield 30 kg) were in 3 groups given diets based on cubed hay, beet pulp, maize and soyabean meal and containing 72% TDN, 17% crude fibre and 20, 17 or 14.4% crude protein (CP) (digestible crude protein 15.7, 12.8 or 10.2%). Cows on the 14%-CP diet ate more than those on the 17%-CP diet, so that av. CP intakes of the 2 groups were similar, and lower than for cows given 20%-CP.

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