Nitrogen Metabolism in the Bovine: Adjustment to Nitrogen Source as Reflected by Changes in Abomasal Nitrogen and Plasma Components
- 1 April 1975
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Animal Science
- Vol. 40 (4) , 775-782
- https://doi.org/10.2527/jas1975.404775x
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. Copyright © 1975. American Society of Animal Science . Copyright 1975 by American Society of Animal Science.Keywords
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