Comparison of Ammonium Salts and Urea in Rations for Lactating Dairy Cows

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Abstract
Four isonitrogenous concentrates that contained soybean meal, urea, ammonium propionate or ammonium lactate as supplemental nitrogen sources were fed to 36 cows (nine per treatment) at a level of 1 kg per 2.5 kg milk for 84 days. The concentrate for each cow was mixed with sufficient corn silage to yield a 10% refusal of the complete feed. Rations were fed once daily. Intakes of urea, ammonium propionate and ammonium lactate were 209, 1,170 and 1,151 g per day, respectively. Milk yields and composition were adjusted by covariance using means of a 14-day standardization period. For soybean meal, urea, ammonium propionate and ammonium lactate, milk yields averaged 23.3, 23.0, 23.8 and 22.7 kg per day; FCM, 19.9, 21.1, 22.7 and 20.9 kg per day; milk fat, 3.0, 3.6, 3.5 and 3.5%; and milk solids-not-fat, 8.84, 8.92, 8.99 and 8.83%. FCM was higher (P< .05) for non-protein nitrogen treatments than soybean meal. Dry matter intakes were 18.4, 18.7, 17.7 and 17.9 kg per day for the respective treatments. Copyright © 1974. American Society of Animal Science . Copyright 1974 by American Society of Animal Science.

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