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Effects of Dietary Soy or Urea Nitrogen and Feeding Frequency on Nitrogen Metabolism, Glucose Metabolism and Urinary Metabolite Excretion in Sheep

U.S. Department of Agriculture³, Clay Center, Nebraska 68933

Abstract

Urinary citrate excretion was significantly increased in sheep fed a purified ration twice daily which contained urea (U) as the only dietary nitrogen (N) source compared to excretion in controls fed soybean protein. Increasing the frequency of feeding to 12 times from twice daily decreased urinary citrate excretion in the U-fed sheep. Urinary citrate excretion was not affected when sheep were fed a natural ration containing 42% of the dietary N as urea. N retention was significantly improved on days 8 to 11 by feeding a natural ration containing U 12 times per day compared to twice daily. The decreased N retention appeared to be accounted for primarily by a decrease in dry matter intake. The differences in dry matter intake and N retention due to frequency of feeding were not observed on days 32 to 35 of the experiment. Frequency of feeding or source of dietary N did not influence feed consumption, gain or feed efficiency in a separate experiment of 44 days duration.

¹ Cooperation of the Nebraska Agricultural Experiment Station, University of Nebraska, Lincoln is acknowledged. The author gratefully acknowledges the assistance of D. Shaw, L. Peshek, and B. Larson in the care of the experimental animals, the laboratory assistance of Ms. S. Scheifelbein and the secretarial assistance of Ms. B. Wells in the preparation of this manuscript.

² U.S. Meat Animal Research Center, Agricultural Research Service.

³ Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may be suitable.