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Title: NUTRITIONAL EVALUATION OF POULTRY BYPRODUCT MEAL AS A PROTEIN SOURCE FOR RUMINANTS: SMALL INTESTINAL AMINO ACID FLOW AND DISAPPEARANCE IN STEERS

Author
item BOHNERT, D - UNIVERSITY OF KENTUCKY
item LARSON, B - UNIVERSITY OF KENTUCKY
item BAUER, M - UNIVERSITY OF KENTUCKY
item BRANCO, A - UNIVERSITY OF KENTUCKY
item McLeod, Kyle
item HARMON, D - UNIVERSITY OF KENTUCKY
item MITCHELL, G - UNIVERSITY OF KENTUCKY

Submitted to: Journal of Animal Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/22/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary: Poultry byproduct meal has potential for use as a supplemental nitrogen source for ruminants. The results of this study showed that inclusion of poultry byproduct meal in the diet of growing steers increased the flow of total amino acids to the intestines compared with either urea or soybean meal. The relative increase in total amino acid flow, associated with poultry byproduct meal, was the result of an increase in the delivery of dietary amino acids to the intestines with no change in the delivery of bacterial amino acids. Intestinal absorption of essential and non-essential amino acids was similar for poultry byproduct meal, urea, and soybean meal. Based on these results, poultry byproduct meal can be substituted for soybean meal, on a nitrogen basis, without affecting intestinal absorption of essential and non-essential amino acids. In light of the Food and Drug Administration proposed ban of feeding mammalian tissues to ruminants, poultry byproduct meal would be an acceptable alternative for use as a source of supplemental nitrogen.

Technical Abstract: Steers (n=6) fitted with ruminal, duodenal and ileal cannulas were used to evaluate the effect of feeding poultry byproduct meal (PBM) on small intestinal flow and disappearance of amino acids. The diets were formulated (DM basis) to contain 11.5% CP and consisted of 49% corn silage, 36% cottonseed hulls and 15% supplement. Supplements contained 37% CP with sources of supplemental N being soybean meal (SBM) and 0, 25, 50, 75 and 100% PBM, with urea used to balance for N. Poultry byproduct meal linearly increased (P < .07) duodenal flow of all amino acids. Duodenal flow of amino acids, except for His, were greater (P < .09) for 100% PBM compared with SBM. Similarly, duodenal flow of non- bacterial amino acids linearly increased (P <.05) with PBM and were greater (P < .05) for 100% PBM compared with SBM. Duodenal bacterial essential, non-essential and total amino acid flows were not affected (P > .80) by PBM, however, they were greater (P < .04) for SBM compared with 0 and 100% PBM. Small intestinal disappearance of Arg, Lys and Pro increased linearly (P < .10) for PBM and 100% PBM increased (P < .07) disappearance of Arg and Ala compared fwith SBM. Supplemental N source had no effect (P > .29) on apparent small intestinal disappearance of essential, non-essential and total amino acids. These data suggest that when PBM, SBM and urea were used as sources of supplemental N, the disappearance of amino acids from the small intestine of steer calves consuming a corn-silage and cottonseed hulls based diet were similar.