Milk Production Response of Dairy Cows Fed High-Moisture Grass Silage. I. Effect of Varying Levels of Hay and Concentrate

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Abstract
Feeding the higher level of concentrate (0.6 kg/kg 4% fat-corrected-milk over 8.16 kg) resulted in the production of more 4% fat-corrected-milk (P<0.01) as well as higher percentages of milk protein (P 0.01) and solids-not-fat (P 0.01) than was produced when the lower level of concentrate (0.3 kg/kg 4% fat-corrected-milk over 8.16) was fed. Varying the level of hay fed between 0.5 and 1.0 kg/100 kg body weight had no significant effect on the amount of milk produced or its composition. Likewise, no significant effects on the per cent of milk fat were observed by varying levels of hay or concentrate.