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Milk Production Response to Nitrogen Solubility in Dairy Rations¹

Texas Agricultural Experiment Station, College Station, TX

ABSTRACT

Twenty Holstein cows, in their 8th to 10th wk of lactation, were assigned randomly to four equal groups in a 2 x 2 factorial 9-wk experiment to determine the effect of nitrogen solubility on protein utilization. Two percents of protein (13 and 15%) and two nitrogen solubilities (22 and 42%) were obtained by selecting from natural feedstuffs. Four complete rations (concentrate plus sorghum silage) were fed ad libitum.

Soluble nitrogen did not affect average daily intakes of dry matter, crude protein, or net energy-lactation. However, the higher protein increased these average daily intakes. The lower nitrogen solubility increased milk yield. No significant effects were detected in total milk solids, milk fat, milk protein, and milk solids-not-fat percentages.

¹ Technical paper No. 13433 of the Texas Agricultural Experiment Station, College Station.

² Animal Science Department, University of Kentucky, Lexington, KY 40506.

³ Director Dairy Programs, Curtiss Breeding Service, Cary, IL 60013.