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Department of Dairy Michigan, Agricultural Experiment Station, East Lansing
ABSTRACT
Two trials were conducted to determine the effects of finely, medium, and coarsely ground grain (1/16, 1/8, and 5/16 in. screens) and four different water-to-concentrate ratios (air-dry, 0.5, 1.0, and 1.5 lb. of water per pound of concentrate) on the concentrate consumption rate and milking rate of dairy cows. Twelve Brown Swiss cows were used in Trial I under pen-type barn feeding conditions. Eleven Brown Swiss and two Holstein cows were used in Trial II to study the effects both during barn feeding and when the cows were on pasture.
The data show that as the ratio of water-to-concentrate increased, there was a decrease in eating time. These results have been explained on the basis of changes in the methods of eating concentrates with different water-to-concentrate ratios. There was no significant change in the eating time for the three degrees of fineness. The cows ate air-dry concentrate more slowly when on good pasture than under barn feeding conditions.
As the concentrate consumption rate decreased, there was a corresponding but not directly proportional decrease in milking rate. The proportional change was similar for each water-to-concentrate ratio.
1 Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal article No. 1510.
2 Present address: Dairy Department, University of Georgia, Athens.
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