Abstract
Three digestion and nitrogen metabolism trials were conducted to determine the influence of folic acid, vitamin B12 and creatine on nutrient digestibility and nitrogen utilization by lambs fed semi-purified rations in which 75% of the total nitrogen of the basal ration was furnished by urea. The retention of absorbed nitrogen by lambs was significantly (P<.05) increased when one-third of the urea nitrogen of the ureabasal ration was replaced with an isonitrogenous amount of creatine. The addition of vitamin B12, or folic acid, or both vitamins at levels of 20 mcg. and 4.5 mg. per day, respectively, did not influence the digestibility of nutrients and utilization of nitrogen by lambs fed rations in which the supplemental nitrogen was furnished by either urea or a mixture of one-third creatine plus urea.
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