caa a22 4500 397568487 CHVBK 20180308164834.0 cr unu---uuuuu 161202e199601 xx s 000 0 eng 10.3382/ps.0750095 doi (NATIONALLICENCE)oxford-10.3382/ps.0750095 Effects of Phytase and 1,25-Dihydroxycholecalciferol on Phytate Utilization and the Quantitative Requirement for Calcium and Phosphorus in Young Broiler Chickens [Elektronische Daten] [R. D. MITCHELL, H. M. EDWARDS] Three experiments were conducted to determine the effects of supplementing 1,25-dihydroxycholecalciferol [l,25-(OH)2D3] and a commercial phytase product on Ca and P requirements of 0- to 21-d-old broiler males. These experiments were conducted with four levels of dietary Ca and P in corn-soybean diets with and without supplementation of 5 μg/kg of l,25-(OH)2D3, 600 units/kg of phytase, and the combination of these supplements. The results show that these levels of phytase and l,25-(OH)2D3 can replace up to 0.1% of the inorganic P for criteria such as BW, bone ash, and plasma P. Both supplements increased phytate P retention, whereas higher levels of Ca and P decreased phytate P retention. The addition of l,25-(OH)2D3, but not phytase, reduced Ca requirements and decreased the incidence of tibial dyschondroplasia. The combination of these levels of phytase and l,25-(OH)2D3 replaced 0.2% inorganic P for criteria such as BW, bone ash, and P rickets. Total dietary P requirements are estimated to be between 0.55 and 0.60% at the levels of phytase and l,25-(OH)2D3, listed above, or 0.45% when the combination is added. The Ca requirements are estimated to be 0.77% when l,25-(OH)2D3 is added to the diet and 0.9 to 0.95% when phytase is added. © 1996 Poultry Science Association, Inc. Metabolism and Nutrition nationallicence calcium nationallicence phosphorus nationallicence phytase nationallicence 1 nationallicence 25-dihydroxycholecalciferol 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), 95-110 0032-5791 75:1<95 1996 75 ps https://doi.org/10.3382/ps.0750095 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750095 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), 95-110 0032-5791 75:1<95 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