Evaluation of tibial dyschondroplasia development in broiler chickens fed diets containing 25 hydroxicolecalciferol | Avaliação do desenvolvimento da discondroplasia tibial em frangos de corte submetidos à dieta com 25 hidroxicolecalciferol

<span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;"><p>This research was carried out to evaluate 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 <span style="font-family: MinionPro-Regular; font-size: x-small;">were: bird strains (Ross 308, Cobb 500, and Hybro), levels and sources of vitamin D (1250UI D</span></p></span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg without 25-(OH)D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">; <span style="font-family: MinionPro-Regular; font-size: x-small;">1250UI D</span></span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg with 69mg 25-(OH)D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/ton, and 3000UI D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg with 69mg 25-(OH)D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/ton), and two control treatments <span style="font-family: MinionPro-Regular; font-size: x-small;">containing calcium and phosphorus levels with 3000UI D</span></span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg without 25-(OH)D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3 </span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">and 3000UI D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg with 69mg 25-<span style="font-family: MinionPro-Regular; font-size: x-small;">(OH)D</span></span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/ton of feed. Bone characteristics were evaluated. From 1 to 21 days, the results showed that 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. </span></span>

<span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;"><p>Este trabalho teve como objetivo avaliar o desenvolvimento da discondroplasia tibial (DT) em frangos de corte de 1 a 21 dias. Foram utilizados 440 pintinhos machos de um dia, provenientes de matrizes com 60 a 62 semanas de idade, distribuídos em delineamento inteiramente casualisado em esquema fatorial 3x3+2, resultando em 11 tratamentos com quatro repetições de 10 aves cada. Os fatores estudados foram: linhagem da ave (Ross 308, Cobb 500 e Hybro), níveis <span style="font-family: MinionPro-Regular; font-size: x-small;">e fontes de vitamina D (1250UI D</span></p></span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg sem 25-(OH)D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">; 1250UI D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg com 69mg 25-(OH)D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/ton e 3000UI D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg com <span style="font-family: MinionPro-Regular; font-size: x-small;">69mg 25-(OH)D</span></span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/ton) e dois tratamentos controles com níveis de cálcio e fósforo com 3000UI D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg sem 25-(OH)D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3 </span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">e 3000UI D</span></span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/kg com 69mg 25-(OH)D</span></span><span style="font-family: MinionPro-Regular; font-size: xx-small;"><span style="font-family: MinionPro-Regular; font-size: xx-small;">3</span></span><span style="font-family: MinionPro-Regular; font-size: x-small;"><span style="font-family: MinionPro-Regular; font-size: x-small;">/ton de ração. Foram avaliadas características ósseas. No período de 1 a 21 dias, os resultados indicaram que as concentrações de cálcio e fósforo nas tíbias não foram influenciadas pelos tratamentos e que o consumo de ração foi superior para os tratamentos que compõem o fatorial. A resistência óssea também não foi influenciada pelos tratamentos e a análise histológica não evidenciou lesões características de DT. Conclui-se que, nas condições experimentais da presente pesquisa, o desenvolvimento de DT não foi observado.</span></span>