Phytase and 1(alpha)-Hydroxycholecalciferol: Their Role in Improving Nutrient Bioavailability in Chickens and Pigs
Biehl, Robert Richard
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https://hdl.handle.net/2142/83633
Description
Title
Phytase and 1(alpha)-Hydroxycholecalciferol: Their Role in Improving Nutrient Bioavailability in Chickens and Pigs
Author(s)
Biehl, Robert Richard
Issue Date
1997
Doctoral Committee Chair(s)
Baker, David H.
Department of Study
Animal Sciences
Discipline
Animal Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Food Science and Technology
Language
eng
Abstract
The mechanism by which hydroxylated vitamin D$\sb3$ compounds improve mineral utilization in chickens was evaluated using a variety of methodologies. In chicks fed vitamin D$\sb3$-adequate and P-deficient diets, supplemental 1$\alpha$-OH D$\sb3$ was unable to improve nonphytate-P utilization ($P<0.05$). In another assay, duodenal mucosal cells from chicks fed P-deficient diets, with or without supplemental 1$\alpha$-OH D$\sb3$, were obtained and analyzed for intestinal phytase activity. Chicks fed supplemental 1$\alpha$-OH D$\sb3$ had significantly higher bone ash values ($P0.10$) the specific activity of intestinal phytase in the duodenal mucosal tissue of chicks. Cecectomized chicks also were utilized to determine the role of microbially-produced phytase in the response to hydroxylated vitamin D$\sb3$ compounds. Bone ash responses to 1$\alpha$-OH D$\sb3$ and phytase supplementation were nearly identical in both cecectomized and sham-operated birds, indicating an insignificant role of the cecal microflora in the phytate-P releasing activity of 1$\alpha$-OH D$\sb3$. In conclusion, the marked phytate-P releasing capacity of dietary 1$\alpha$-OH D$\sb3$ and 1,25-(OH)$\sb2$ D$\sb3$ is apparently not caused by increased intestinal phytase activity.
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