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The Efficiency of Utilization of Protein in Milk Production, as Indicated by Nitrogen Balance Experiments

Institute of Animal Nutrition, Pennsylvania State College, State College, Pennsylvania

ABSTRACT

Conclusions: In a group of 45 balance periods, averaging eighteen days in length, with farrow Holstein Friesian cows in the first half of the period of lactation, producing, on the average, 42.6 pounds of milk per day, on a plane of feed intake sufficient, on the average to maintain slight nitrogen storage and live-weight equilibrium, the average utilization of feed nitrogen for milk production and body gain was 31.6 per cent, ±0.4 per cent, and the utilization of utilizable nitrogen (feed minus maintenance) was 38.0 per cent, ±0.5 per cent.