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- Title
Dietary sources of starch affect intestinal absorption and metabolism of glucose and amino acids in growing pigs.
- Authors
Zhang, J.; Yin, Y. L.; Wu, G. Y.
- Abstract
The objective of this study was to determine the effect of dietary starch sources on the balance of glucose and amino acids across the portal-drained viscera (PDV) of growing pigs. Four Duroc×Landrance×Yolkshire cross-bred barrows (with an average body wt of 22.5 kg) were housed individually in stainless steel metabolism cages and trained to consume feed provided daily. After a 2-wk adaptation period, pigs were fitted with permanent catheters in the portal vein, mesenteric vein, and carotid artery. After a 13-d recovery period, pigs were assigned randomly into one of 4 treatment groups in a 4×4 Latin square design representing 4 cornstarch- and casein-based isocaloric and isonitrogenous diets containing 52.0% corn, 65.8% brown rice, 65.3% sticky rice, and 51.8% Hi-Maize 1043 (resistant starch). Pigs were fed 3 times daily at 07:30, 15:30 and 23:30 at a feeding level of >963 kJ DE/kg diet. Each diet was fed to the pig after a 6-d adaptation period. On d 7, blood samples were obtained simultaneously from the 3 catheters at 30 min prior to feeding and hourly for 8 h after feeding. Portal blood flow was measured using p-aminohippuric acid. Results showed that portal glucose absorption (expressed per 100 g feed intake) was lower (P < 0.05) for the resistantstarch diet compared with corn, stick rice and brown rice diets at all sampling times. In comparison with the corn diet, net portal glucose absorption was higher (P < 0.05) for the sticky rice and brown rice diets up to 4 h after feeding, but was reduced (P < 0.05) thereafter. Feeding the resistant-starch diet reduced (P < 0.05) the net portal absorption of total amino acids, particularly Pro, Leu, and Ile. The net appearance of total amino acids absorbed from the ileum differed (P < 0.05) among the treatment groups, and was 48.4, 63.8, 61.8, and 59.3%, respectively, for piglets fed the corn, brown rice, sticky rice, and resistant-starch diets. These findings indicate that dietary sources of starch affect intestinal absorption and metabolism of glucose and amino acids in growing pigs. Supported by funds from Chinese Academy of Sciences and China NSF.
- Subjects
CHINA; CHINESE Academy of Sciences (Beijing, China); INTESTINAL absorption; AMINO acid metabolism; BROWN rice; STARCH; INTESTINAL mucosa; SWINE; MESENTERIC veins; REDUCING diets
- Publication
Journal of Animal Science, 2006, Vol 84, p287
- ISSN
0021-8812
- Publication type
Article