title: Influence of rumen escape starch on pancreatic exocrine secretion of goats.
abstract: The objective of the experiment was to evaluate the effect of rumen escape starch (RES), accomplished by altering dietary starch concentrations on pancreatic exocrine secretion of goats. Four goats (36.8 +/- 3.2 kg) with common bile duct re-entrant and duodenal catheters were used in a 4 x 4 Latin square. Goats were fed diets containing 20%, 30%, 40% and 50% starch. Periods consisted of 10 day adaptation followed by 3 day of sample collection. Juice was collected in 1-h fractions continuously for 72 h. Total juice secreted was recorded, and 3% sub samples were retained to form a composite sample. The remaining fluid was returned to the duodenum. Juice composite samples were analyzed for activities of alpha-amylase, trypsin, chymotrypsin and lipase. Secretion of pancreatic alpha-amylase was lower (p < 0.05) when comparing lambs fed 20% starch diet with 30%, 40% and 50% starch diets. Lipase secretion was greater (p < 0.05) in lambs fed 40% starch diet compared with the other diets. Total secretion of juice, trypsin and chymotrypin was not affected (p > 0.05) by dietary starch concentration. Rumen escape starch increased with increasing dietary starch concentration (p < 0.05). Regression analysis showed that increasing RES results in a quadratic increase (p < 0.05) in pancreatic alpha-amylase and lipase secretion, and the secretion of alpha-amylase and lipase is maximum when RES is 113 and 83 g/day respectively. These results suggest that optimal RES for pancreatic secretion of alpha-amylase and lipase is 80-110 g/day in adult goats.
authors.affiliation: College of Animal Science, Northwest A&F University, Shaanxi, Yangling 712100, P. R. China.
authors.forename: M
authors.initials: M
authors.lastname: Xu
authors.forename: S
authors.initials: S
authors.lastname: Du
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: Z P
authors.initials: ZP
authors.lastname: Yu
authors.forename: D L
authors.initials: DL
authors.lastname: Harmon
authors.forename: J H
authors.initials: JH
authors.lastname: Yao
mesh_terms: D000818:Animals; D002404:Catheterization / Q000662:veterinary; D002918:Chymotrypsin / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004386:Duodenum / Q000378:metabolism; D006041:Goats / Q000378:metabolism*; D008049:Lipase / Q000378:metabolism*; D008297:Male; D046790:Pancreas, Exocrine / Q000378:metabolism*; D011897:Random Allocation; D012417:Rumen / Q000378:metabolism*; D013213:Starch / Q000008:administration & dosage* / Q000378:metabolism*; D014357:Trypsin / Q000378:metabolism; D000516:alpha-Amylases / Q000378:metabolism
chemical_list: D013213:Starch; D008049:Lipase; D000516:alpha-Amylases; D002918:Chymotrypsin; D014357:Trypsin