Wheat bran and oat hulls have dose-dependent effects on ad-libitum feed intake in pigs related to digesta hydration and colonic fermentation
| Autor: | Simon Diffey, Barbara A. Williams, Vishal Ratanpaul, Dagong Zhang, Michael J. Gidley, J. L. Black |
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| Rok vydání: | 2019 |
| Předmět: |
Dietary Fiber
Male 0301 basic medicine Avena Colon Swine Dose dependence Eating Feces 03 medical and health sciences Nutrient Animal science Ileum Distal ileum Colonic fermentation Animals Triticum 030109 nutrition & dietetics Bran Chemistry Water General Medicine Fatty Acids Volatile Animal Feed 030104 developmental biology Oat hulls Digestion Fermentation Food Science |
| Zdroj: | Food & Function. 10:8298-8308 |
| ISSN: | 2042-650X 2042-6496 |
| DOI: | 10.1039/c8fo02496k |
| Popis: | Undigested nutrients and fermentable fibre in the distal ileum and colon stimulate intestinal brakes, which reduce gastric-emptying and digesta-passage-rate, and subsequently limit feed/food-intake. Fibre can also stimulate passage rate potentially increasing feed intake (FI). In order to experimentally determine the relationships between these two hypothesised actions of fibre, five levels of wheat-bran (WB) or oat-hulls (OH) were added to a highly digestible starch-based diet fed to pigs ad-libitum for three weeks. Average-daily-feed-intake (ADFI), faecal short-chain-fatty-acids (SCFA) and related parameters were determined at 7, 14 and 21d. A linear mixed model was fitted to FI and fermentation parameters. Overall, WB diets showed 8-11% lower ADFI (7-14d: p < 0.05; 7-21 & 0-21d: p = 0.053) than OH diets. WB diets produced over 20% more (21d: p < 0.01) SCFA than OH or Control diets. WB at 25% produced 22% more (7d: p < 0.05) SCFA than any other diet. Diets with WB at 25 and 35%, showed higher hydration capacity than any other diet (p < 0.001). OH at 10% had an unusually low FI and a markedly higher hydration capacity. With increasing levels of OH, intake of base diet was 7% more than control at 5% OH, but 8% less than control at 20% OH. With increasing WB content, intake of base diet decreased. From these results, we propose that three mechanisms control the effects of fibre on FI: initial increase in passage rate and feed intake at low concentrations of non-swelling fibres; a depression in FI from high fibre bulk; and reduced feed intake from stimulation of ileal and colonic brakes. |
| Databáze: | OpenAIRE |
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