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Comparison of a Liquid Supplement of Nonprotein Nitrogen with Urea and Soybean Meal for Lactating Cows¹

Department of Animal Sciences, University of Kentucky, Lexington 40506

ABSTRACT

Eighteen Holstein cows were allotted to three pens for a 3 x 3 Latin square design (3 weeks per period). In addition to corn silage and pelleted concentrate, each cow received daily 0.9 kg of soybean meal, or 0.9 kg or 1.8 kg of liquid supplement which was 50% crude protein, all from nonprotein nitrogen. Cows receiving 1.8 kg liquid supplement yielded less milk (P < .01), ate less corn silage, and retained more nitrogen (P < .01). Plasma urea was higher for liquid supplement treatments than for soybean meal and for 1.8 kg liquid supplement than for 0.9 kg liquid supplements (P < .05). In Experiment 2, 24 Holstein cows were allotted to six pens for a replicated 3X3 Latin square design (5 weeks per period). Complete rations were 76.7% corn silage and (A) 18.6% ground shelled corn, 4.0% soybean meal, 0.7% mineral and vitamin supplements; (B) 21.2% ground shelled corn, 1.0% soybean meal, 0.37% urea, 0.7% mineral and vitamin supplements; or (C) 20.2% ground shelled corn, 1.0% soybean meal, 2.1% liquid supplement. Milk yield and feed intake were depressed by the nonprotein nitrogen rations (P < .05). Plasma ureas were higher for nonprotein nitrogen-treated cows than for cows receiving (A) (P < .01) and higher (P < .05) for urea —(B) than for liquid supplement-treated cows (C). Nitrogen retention wah higher in cows receiving (C) than (B) (P < .05). Solids-corrected milk differences were not significant nor were milk fat percentages.

¹ Investigation reported in this Paper 69-5-103, is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the director. This research was supported in part by Allied Chemical Company, New York City.