2026-09-22T18:38:42Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/83633 2023-07-11 col_2142_5131 col_2142_14771 com_2142_5130 com_2142_685 com_2142_397

Baker, David H. Biehl, Robert Richard 2015-09-25T21:08:32Z 2015-09-25T21:08:32Z 10000-01-01 1997 1997 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. Made available in DSpace on 2015-09-25T21:08:32Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9737052.pdf: 6117384 bytes, checksum: cf7ac9986a849723ed90723d5b679aec (MD5) Previous issue date: 1997 Embargo set by: Seth Robbins for item 84914 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 126 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997. http://hdl.handle.net/2142/83633 (MiAaPQ)AAI9737052 eng Agriculture, Food Science and Technology Phytase and 1(alpha)-Hydroxycholecalciferol: Their Role in Improving Nutrient Bioavailability in Chickens and Pigs text Animal Sciences Animal Sciences University of Illinois at Urbana-Champaign Dissertation Ph.D.