Evaluation of tibial dyschondroplasia development in broiler chickens fed diets containing 25 hydroxicolecalciferol: ultrastructural characteristics / Avaliação do desenvolvimento da discondroplasia tibial em frangos de corte submetidos à dieta com 25 hidroxicolecalciferol: características ultraestruturais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This research was carried out to evaluate the performance and the development of tibial dyschondroplasia (TD) in broilers from 1 to 21 days. Four hundred forty day-old male chickens, from broiler breeders aged 60-62 weeks, were randomly distributed in a 3x3+2 factorial arrangement, resulting in 11 treatments with four replicates of 10 birds each. The factors evaluated were: bird strains (Ross 308, Cobb 500, and Hybro), levels and sources of vitamin D (1250UI D3/kg without 25-(OH)D3; 1250UI D3/kg with 69mg 25-(OH)D3/ton, and 3000UI D3/kg with 69mg 25-(OH)D3/ton), and two control treatments containing calcium and phosphorus levels according to Rostagno et al. (2005) with 3000UI D3/kg without 25-(OH)D3 and 3000UI D3/kg with 69mg 25-(OH)D3/ton of feed. Performance and bone characteristics were evaluated. From 1 to 21 days, the results showed that weight gain, feed conversion, and bone calcium and phosphorus concentrations were not influenced by the treatments, however, feed intake was higher for factorial than control treatments. Bone breaking resistance was not influenced by the treatments and there were no typical lesions of TD. In conclusion, it was not observed TD development in broilers from 1 to 21 days according to experimental procedures of this research.

ASSUNTO(S)

frango de corte growth plate tibial dyschondroplasia broiler chickens discondroplasia tibial placa de crescimento

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