Please use this identifier to cite or link to this item:
|Title:||Contribution of intestinal- and cereal-derived phytase activity on phytate degradation in young broilers||Contributor(s):||Morgan, Natalie (author) ; Walk, C L (author); Bedford, M R (author); Burton, E J (author)||Publication Date:||2015||Open Access:||Yes||DOI:||10.3382/ps/pev108||Handle Link:||https://hdl.handle.net/1959.11/19976||Fields of Research (FoR) 2008:||070204 Animal Nutrition||Fields of Research (FoR) 2020:||300303 Animal nutrition||Socio-Economic Objective (SEO) 2008:||839999 Animal Production and Animal Primary Products not elsewhere classified||Socio-Economic Objective (SEO) 2020:||109999 Other animal production and animal primary products not elsewhere classified||Abstract:||There is little consensus as to the capability of poultry to utilize dietary phytate without supplemental phytase. Therefore, an experiment was conducted to examine the extent to which endogenous phytase of intestinal and cereal origin contributes to phytate degradation in birds aged 0 to 14 d posthatch. Ross 308 broilers (n = 720) were fed one of 4 experimental diets with differing dietary ingredient combinations and approximate total phytate levels of 10 g/kg, dietary phytase activity analyzed at 460 U/kg, dietary calcium (Ca) levels of 11 g/kg, and nonphytate-phosphorus (P) levels of 4 g/kg. Broiler performance, gizzard, duodenum, jejunum and ileum pH, Ca and P digestibility and solubility, amount of dietary phytate hydrolyzed in the gizzard, jejunum, and ileal digesta phytase activity were analyzed at d 4, 6, 8, 10, 12, and 14 posthatch. Intestinal endogenous phytase activity increased significantly (P < 0.001) between d 4 and 6, resulting in increased phytate hydrolysis in the gizzard (P = 0.003), jejunum (P < 0.001), and ileum (P < 0.001). Phytase activity and phytate hydrolysis continued to increase with age, with a greater phytase activity and associated increase in phytate hydrolysis and mineral utilization between d 10 and 12. Gizzard and jejunum Ca and P solubility and ileal Ca and P digestibility increased significantly (P < 0.001), and gastrointestinal pH decreased significantly (P < 0.001) between d 4 and 6. By d 14, phytase activity recovered in the ileum was approximately 45 U/kg. There were strong correlations between phytase activity measured in the ileum and phytate hydrolyzed in the gizzard (r = 0.905, P < 0.001), jejunum (r = 0.901, P = 0.023), and ileum (r = 0.938, P = 0.042). This study shows intestinal- and dietary-derived endogenous phytase activity is responsible for phytate-P hydrolysis in broilers.||Publication Type:||Journal Article||Source of Publication:||Poultry Science, 94(7), p. 1577-1583||Publisher:||Oxford University Press||Place of Publication:||United States of America||ISSN:||1525-3171
|Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal|
|Appears in Collections:||Journal Article|
School of Environmental and Rural Science
Files in This Item:
Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.