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Interval Urea Infusion for Lambs¹

University of Illinois at Urbana-Champaign³, Urbana 61801

Abstract

THREE metabolism trials were conducted to study the effect of interval infusions (0-, 1-, 3- or 12-hr. intervals repeated every 12 hr.) of urea into the rumen of lambs fed twice daily. An apparatus was developed to mechanically effect interval intraruminal urea infusions repeatedly and thereby simulate rapid and slow ammonia release NPN compounds. With dietary energy levels of 60, 65 and 75% TDN, the infusion of urea to supplement the basal diet to approximately 12% protein generally improved nitrogen retention. With the high energy diet, 1-hr. or rapid infusion proved superior to more gradual infusions. With all diets, the 1-hr. or 3-hr. infusions supported greater nitrogen retentions than continuous infusion. With lower energy diets, as infusion time was extended to 3 hr., nitrogen balance improved slightly. Urea infusions did not significantly affect dry matter digestibility.

¹ Supported in part by funds from Federal Hatch 353.

² Present address: Bureau of Veterinary Medicine, VM-110, Food and Drug Administration, Rockville, Md.

³ Department of Animal Science.