Journal
JOURNAL OF ANIMAL SCIENCE
Volume 90, Issue -, Pages 113-115Publisher
OXFORD UNIV PRESS INC
DOI: 10.2527/jas.51839
Keywords
amino acid; fermentation; ileal digestibility; lower gut; nitrogen
Categories
Funding
- Ontario Pork
- Canadian Swine Research and Development Cluster, Evonik Industries AG
- National Sciences and Engineering Research Council of Canada
- Ontario Ministry of Agriculture, Food, and Rural Affairs
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An implicit assumption in measures of ileal digestibility (ID) to estimate bioavailability of AA and N is that ID is not influenced by lower gut N metabolism. The absorption of nitrogenous compounds from the lower gut, derived from fermentative AA catabolism, may have an impact on N metabolism and microbial AA synthesis in the upper gut as a result of CO(NH2)(2) recycling. The objective of this trial was to determine the apparent ID of N and AA in growing pigs fed a corn (Zea mays) starch and soybean (Glycine max) meal-based diet and receiving an infusion of N into the caecum at 40% of N intake. Eight pigs (initial BW of 23.3 +/- 0.55 kg) were fitted with simple T-cannulas in the ileum and cecum and randomly assigned to 1 of 3 continuous cecal infusion treatments [saline, sodium caseinate, or CO(NH2)(2)] according to a crossover design with 3 periods. Digesta samples were collected and pooled per pig for each 2-d period, freeze-dried, ground, and analyzed for DM, OM, total N, and AA. Lower gut N supply did not affect apparent ID of DM, OM, total N (85.4, 83.4, and 82.7 +/- 1.74%; P = 0.31), or any AA (e. g., 90.1, 89.0, and 89.9 +/- 1.08% for Lys; P = 0.70) for saline, casein, and CO(NH2)(2) treatments, respectively. Apparent ID may be an insufficiently sensitive measure to determine effects of lower gut N metabolism on N absorption from the lower gut and subsequent recycling into the upper gut.
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