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Effect of Proteins of Plant and Animal Origin on the Growth, Reproductive Development and Semen Production of Young Dairy Bulls^{1, 2,}

Dairy Breeding Research Center, The Pennsylvania State University, University Park

ABSTRACT

Eighteen Holstein bull calves (six per treatment) were used to determine the effect of dietary protein quality upon the growth, reproductive development, and the quality of semen produced by young bulls. The treatments included animal protein as fluid skimmilk, animal protein as animal feeding grade dried skimmilk, and vegetable protein.

Source of protein had no significant effect upon growth, the concentration of hemoglobin, total serum protein, urea, and nonprotein nitrogen in the blood, or the age or size at which viable spermatozoa were first collected from the bulls.

Tests of semen quality indicated that volume of ejaculate was adversely affected by the dried skimmilk ration, and number of spermatozoa per milliliter of semen was increased by the liquid skimmilk ration; initial motility, rate of motility, per cent live (unstained) spermatozoa, and survival upon storage at 5° C. were not affected by the treatments used.

¹ Authorized for publication on May 18, 1955 as Paper No. 1982 in the journal series of the Pennsylvania Agricultural Experiment Station.

² Supported in part by funds from the regional project NE-1 entitled "Causes and Prevention of Reproductive Failures in Dairy Cattle," a cooperative study involving agricultural experiment stations in the Northeastern region and the Dairy Husbandry Research Branch, U. S. Department of Agriculture.