{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,7]],"date-time":"2026-05-07T17:42:33Z","timestamp":1778175753542,"version":"3.51.4"},"reference-count":48,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2019,12,18]],"date-time":"2019-12-18T00:00:00Z","timestamp":1576627200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Government of Canada Natural Sciences and Engineering Research Council of Canada Industrial Research Chair Program","award":["IRCSA 452664-12"],"award-info":[{"award-number":["IRCSA 452664-12"]}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Animal Physiology Nutrition"],"published-print":{"date-parts":[[2020,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Indigestible dietary protein fermentation products have been suggested to negatively influence broiler performance due to their impact on health and digestive tract morphology. This study evaluated the digestive tract morphology and caecal protein fermentation metabolites of broiler fed 3 dietary protein levels (24%, 26% and 28%) with low or high indigestible protein (LIP, HIP). Two completely randomized 3\u00a0\u00d7\u00a02 factorial trials were conducted with protein level (PL) and indigestible protein (IDP) as the main factors. In both trials, birds received six diets (24\u2010LIP, 24\u2010HIP, 26\u2010LIP, 26\u2010HIP, 28\u2010LIP and 28 HIP) formulated with no medication. On day 5, trial 1 birds were vaccinated with Coccivac\u2010B52, while trial 2 received no vaccine. Tissue and caecal samples were collected and caecal contents analysed for fermentation metabolites. Differences were considered significant when <jats:italic>p<\/jats:italic>\u00a0\u2264\u00a0.05. The LIP treatment caecal content in trial 1 at 14\u00a0days had greater histamine, agmatine and cadaverine levels, while HIP diets resulted in increased serotonin, tryptamine and spermidine. Histamine, serotonin and tryptamine at day 28 were not affected by IDP, and ammonia was not affected by treatments at day 14 or day 28. At day 14, HIP birds had lower total short\u2010chain fatty acids, higher caecal pH and heavier pancreas, proventriculus, gizzard, jejunum and ileum weights. The same effects of IDP found in trial 1 were observed for histamine, agmatine, cadaverine, serotonin, tryptamine and spermidine at day 21 in trial 2. Trial 2 had a PL\u2010by\u2010IDP interaction influencing tyramine, spermidine (28\u2010LIP\u00a0&gt;\u00a024\u2010LIP) and spermine with values increasing with PL for LIP diets and remaining constant for HIP diets. An interaction between PL and IDP was found for ammonia level and was similar to interactions for biogenic amines. In conclusion, dietary PL and IDP influence broiler caecal protein fermentation metabolites and those effects varied with coccidiosis vaccination and rearing environment.<\/jats:p>","DOI":"10.1111\/jpn.13256","type":"journal-article","created":{"date-parts":[[2019,12,19]],"date-time":"2019-12-19T04:28:30Z","timestamp":1576729710000},"page":"847-866","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["The influence of indigestible protein on broiler digestive tract morphology and caecal protein fermentation metabolites"],"prefix":"10.1111","volume":"104","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2915-6626","authenticated-orcid":false,"given":"Dervan D. S. 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