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Utilization of Urea by Young Calves

One Figure

School of Nutrition, Cornell University, Ithaca, New York

Calves 2 months of age were unable to grow when they were fed a diet containing only 4.4% protein. When urea was added to the diet to give a calculated protein content of 16.2% (N x 6.25) calves increased in body weight and height at fairly satisfactory rates. The calves fed the basal diet were in negative nitrogen balance while those receiving the added urea were in positive nitrogen balance, retaining 24 to 36% of the dietary nitrogen. The apparent digestibility of the dry matter and carbohydrates of the basal diet was 57 to 63%, while the dry matter and carbohydrates of the urea diet were 74 to 80% digested.

Feeding daily supplements of the B vitamins did not increase the rate of growth or the efficiency of nitrogen utilization.

The riboflavin content of the organs and edible meat was not increased by feeding supplements of the B vitamins.