Milk Production Response to Nitrogen Solubility in Dairy Rations

Abstract

Twenty Holstein cows, in their 8th to 10th wk of lactation, were assigned randomly to four equal groups in a 2 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.