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Journal of Dairy Science Vol. 54 No. 12 1861-1865
© 1971 by American Dairy Science Association ®
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Effect of Urea in the Concentrate Mixture on Intake and Production of Cows Fed Corn Silage as the only Forage1

J. R. Plummer2, J. T. Miles and M. J. Montgomery

Department of Dairying, University of Tennessee, Knoxville 37901

ABSTRACT

Eighty-four lactating Holstein cows fed corn silage as the only forage were used in three experiments to study effects of feeding concentrates containing urea on milk yield and composition, dry matter intake, and body weight changes. The percent of urea in the concentrates ranged from 0 to 3% and furnished from 0 to 35% of the total ration nitrogen. Effects of frequency of feeding and mineral supplementation of concentrates containing urea were investigated.

Milk yields, protein, solids-not-fat, and silage intake were not affected (P>.05) by the substitution of 2 or 3% urea in the concentrate to replace an equivalent amount of nitrogen from soybean meal. When concentrates containing 0, 2, or 3% urea were fed to cows, milk fat per cent was higher in all experiments and significantly higher in two of the experiments for the cows fed the concentrates which contained urea. Feeding a concentrate which contained 2% urea six times daily versus two times daily did not significantly affect performance. Addition of either .4% sodium sulfate or 1% dicalcium phosphate plus .2% monosodium phosphate to concentrates which contained 3% urea did not improve the use of these concentrates.

FOOTNOTES

1 Data taken from a dissertation submitted to to the Graduate School by the senior author in partial fulfillment of the requirements for the Ph.D. degree, University of Tennessee, Knoxville, August 1970.

2 Present address: Division of Animal Sciences, Delaware Valley College of Science and Agriculture, Doylestown, Pennsylvania 18901.






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Copyright © 1971 by the American Dairy Science Association ®.