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Nitrogen Metabolism in the Bovine: Adjustment to Nitrogen Source as Reflected by Changes in Abomasal Nitrogen and Plasma Components¹

University of Kentucky,³ Lexington 40506

Abstract

Abomasal cannulated steers were used to quantitate various nitrogenous components reaching the abomasum during a 68-day adjustment period to either soybean meal (SBM) or urea supplemented ear corn rations (11% crude protein, CP). Mean estimates showed that total nitrogen (N) reaching the abomasum per day amounted to 64.3 g and 71.7 g for steers fed the urea and SBM rations, respectively (P < .05). Signigicant (P < .05) increases in the peptide N fractions, bound-amino N and free-amino N, accounted for the 11.5% increase in total N on the SBM ration. Following introduction of urea into the basal corn ration, abomasal N decreased for 14 days and then increased linearly (P < .06). For steers on the SBM ration, abomasal N decreased for 8 days and then increased linearly (P < .05) at a daily rate of 250 mg N greater (P < .05) than was observed on the urea ration.

¹ This paper (74-5-94) is published with the approval of the Director of the Kentucky Agricultural Experiment Station.

² Present Address: Department of Meat and Animal Science, University of Wisconsin, Madison.

³ Department of Animal Sciences.