caa a22 4500 397567634 CHVBK 20180308164832.0 cr unu---uuuuu 161202e199601 xx s 000 0 eng 10.3382/ps.0750090 doi (NATIONALLICENCE)oxford-10.3382/ps.0750090 Effect of Dietary 1,25-Dihydroxycholecalciferol Level on Broiler Performance [Elektronische Daten] [KEVIN D. ROBERSON, HARDY M. EDWARDS] Studies were conducted to evaluate the level of dietary 1,25-dihydroxycholecalciferol [1,25-(OH)2D3] required to decrease the incidence of tibial dyschondroplasia (TD) in male broilers at 3 and 5 wk of age. The birds were reared in floor pens with wood shavings and fed a corn-soybean meal diet supplemented with 0, 3, 6, or 9 μg/kg l,25-(OH)2D3. The diet contained, by averaged analyses, 0.73% calcium, 0.74% total phosphorus, and 0.22% phytate phosphorus. There was no treatment effect on body weight or gain:feed at either age. The incidence and severity of TD and the percentage of severe lesions were decreased and bone ash was increased by 6 μg/kg l,25-(OH)2D3 at 3 wk of age. At 5 wk of age, the incidences of TD and severe lesions were decreased when 6 μg/kg l,25-(OH)2D3 was fed. Bone ash was increased by this level in one of the two experiments. Plasma calcium was increased at 5 wk when 9 μg/kg l,25-(OH)2D3 was fed, but there was no treatment effect on plasma dialyzable phosphorus or l,25-(OH)2D3. The results indicate that 6 μg/kg l,25-(OH)2D3 is effective for decreasing TD under practical rearing conditions. © 1996 Poultry Science Association, Inc. Metabolism and Nutrition nationallicence 1 nationallicence 25-dihydroxycholecalciferol nationallicence bone ash nationallicence broiler nationallicence plasma 1 nationallicence 25-dihydroxycholecalciferol nationallicence tibial dyschondroplasia nationallicence ROBERSON KEVIN D. aut EDWARDS HARDY M. 2To whom correspondence should be addressed. aut Poultry Science Oxford University Press 75/1(1996-01), 90-94 0032-5791 75:1<90 1996 75 ps https://doi.org/10.3382/ps.0750090 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750090 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- ROBERSON KEVIN D. aut NATIONALLICENCE 700 1- EDWARDS HARDY M. 2To whom correspondence should be addressed aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/1(1996-01), 90-94 0032-5791 75:1<90 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