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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2000;13(4): 457-463.
DOI: https://doi.org/10.5713/ajas.2000.457    Published online April 1, 2000.
Effects of Feeding High Forage Diets and Supplemental Fat on Feed Intake and Lactation Performance in Dairy Cows
M. Abdullah, J. W. Young, H. D. Tyler, G. Mohiuddin
Fifty mid-lactation Holstein cows were used in a six-week feeding trial to study effects of high-forage, high-fat diets on dry matter intake and production performance. Cows were divided into 10 replicates, each consisting of five cows. Each cow was assigned to a control (diet 1) or one of the four experimental diets (high-forage (75%), high-fat (7.5%) (diet 2); high-forage, medium-fat (5%) (diet 3); medium forage (65%), high-fat (diet 4); medium-forage, medium-fat (diet 5)), or a control diet containing about 50% forage and 2% fat. All diets were isonitrogenous (17.7% crude protein). The forage mixture consisted of 20% alfalfa hay, 40% alfalfa haylage, and 40% corn silage. Supplemental fat included 80% rumen-protected fat and 20% yellow grease. Dry matter intake was decreased (p<0.01) in cows fed experimental diets (18.4, 20.9, 19.9, and 22.6 kg for cows fed diets 1-4, respectively vs. 27.5 kg for cows fed the control diet). Daily milk production was lower (p<0.05) for cows consuming experimental diets (30.5, 31.3, 31.0, and 32.5 kg for cows fed greater for cows consuming experimental diets (1.74, 1.55, 1.60, and 1.53 kg milk/kg dry matter intake for cows fed diets 1-4, respectively, vs. 1.26 kg milk/kg dry matter intake for cows fed the control diet).
Keywords: High Forage Diets; Supplemental Fat; Feed Intake; Milk Production and Composition

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