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Effect of Dehydrated Young Grass as a Supplement in Dry Lot Feeding on the Reproductive Efficiency of Dairy Bulls¹

Dairy Cattle Breeding Research Center, The Pennsylvania State University, State College

ABSTRACT

Eighteen bulls of the Holstein, Guernsey, and Ayrshire breeds and ranging in age from 2 to 14 years were paired on the basis of age, breed, and fertility. One bull of each pair received a concentrate mixture plus grass-legume hay (control group) while the other had 2 lb. of the hay replaced by 2 lb. of dehydrated young grass.

Over a 4-month experimental period the groups were compared on the basis of 60- to 90-day nonreturns to 21,231 first services and laboratory examinations of semen quantity and quality. No difference was found between the two groups, indicating that, under the conditions of this experiment, the supplementation with dehydrated young grass at the rate of 2 lb. daily was of no value in improving the reproductive performance of dairy bulls maintained on a conventional dry lot feeding regime.

¹ Authorized for publication on March 19, 1954, as paper No. 1864 in the journal series of the Pennsylvania Agricultural Experiment Station.