caa a22 4500 39756869X CHVBK 20180308164835.0 cr unu---uuuuu 161202e199601 xx s 000 0 eng 10.3382/ps.0750111 doi (NATIONALLICENCE)oxford-10.3382/ps.0750111 Additive Effects of 1,25-Dihydroxycholecalciferol and Phytase on Phytate Phosphorus Utilization and Related Parameters in Broiler Chickens [Elektronische Daten] [R. D. MITCHELL, H. M. EDWARDS] Two experiments were conducted to compare the effects of supplementation with 1,25-dihydroxycholecalciferol [l,25-(OH)2D3] and a commercial phytase on P utilization by broiler males. Experiment 1 was conducted with three levels of total dietary P (0.45, 0.55, and 0.65%) in corn-soybean meal diets supplemented with 5 μg/kg of l,25-(OH)2D3, 600 units/kg of phytase, or the combination of these supplements in a factorial arrangement from 0 to 21 d in battery brooders. A second experiment was conducted with a similar design except that it was carried out in floor pens for a period of 35 d. In Experiment 1, maximal BW was obtained at 0.65% P in chicks receiving the basal diet, 0.55% P in chicks receiving phytase or l,25-(OH)2D3, and 0.45% P in chicks fed both supplements. Bone ash for chicks receiving the basal, phytase, l,25-(OH)2D3, and combination treatments at 0.45% total dietary P were 26.6, 34.9, 35.1, and 38.8%. There were significant interactions between phytase and 1,25-(OH)2D3 for BW, bone ash, and incidence of rickets. Similar results were noticed in Experiment 2, with the exception that l,25-(OH)2D3 had little influence on BW from 0 to 3 wk, likely due to slightly higher dietary P. From 3 to 5 wk, BW and bone ash were increased by each supplement and further increased by their combination. These interactions suggest different mechanisms of action for these supplements in influencing phytate P utilization. © 1996 Poultry Science Association, Inc. Metabolism and Nutrition nationallicence phytase nationallicence 1 nationallicence 25-dihydroxycholecalciferol nationallicence phytate phosphorus nationallicence chicken nationallicence MITCHELL R. D. aut EDWARDS H. M. 2To whom correspondence should be addressed. aut Poultry Science Oxford University Press 75/1(1996-01), 111-119 0032-5791 75:1<111 1996 75 ps https://doi.org/10.3382/ps.0750111 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750111 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- MITCHELL R. D. aut NATIONALLICENCE 700 1- EDWARDS H. M. 2To whom correspondence should be addressed aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/1(1996-01), 111-119 0032-5791 75:1<111 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford