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The effect of level of concentrate feeding and type of roughage on milk production



The effect of level of concentrate feeding and type of roughage on milk production



Jour Dairy Res 25(3): 365-372



Eight Ayrshire cows were used in a 16-week winter feeding trial in 2 replicates of a 4 x 4 Latin square design utilizing the following rations. All received 40 lbs. of silage daily plus A. 4 lbs. concentrates per gallon of milk and 16 lbs. dried grass; B. 2 lbs. concentrates per gallon milk and 16 lbs. dried grass; C. 4 lbs. concentrates per gallon milk and 16 lbs. hay; and D. 2 lbs. concentrates per gallon milk and 16 lbs. hay. Differences in total daily dry matter consumption were largely attributable to differences in consumption of concentrates (2.5% of live weight on D-3.2% of live weight on A). Milk yield was increased significantly when concentrates were increased to 4 lbs./gallon with either grass product (36.9, 33.9, 37.3, and 33.5 for A - D respectively). For each increase of 1 lb. of starch equivalent + 0.2 lb. of digestible crude protein the milk production increased an average of 0.9 lb. The solids-not-fat content varied with the level of intake (8.42-8.59); most of the variation was in protein. There was a gradation of live weight change from -0.7 lbs./day (D) to + 0.34 lbs./day (A).

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Accession: 014240009

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DOI: 10.1017/s0022029900009389


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