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EnglishAn experiment was performed to evaluate the effect of decreased levels of vitamin D3 in the premix and 1,25-dyhydroxyvitamin D3-glycoside (1,25(OH)2D3-glycoside) supplementation on performance, carcass yield and bone quality in 42d old broilers. Seven-d-old male chickens Cobb500® were distributed in a randomized design with six treatments: a control diet with inclusion of vitamin D3 in the premix, without supplementation of 1,25(OH)2D3-glycoside, and five diets with decreased levels of vitamin D3 (100%, 75%, 50%, 25% and 0% about the control) plus the addition of 1,25(OH)2D3-glycoside, 50g ton-1 of diet. The main results were to reduce the tenor of Vitamin D3 in the premix when the addition of 1,25(OH)2D3-glycoside did not affect (P>0.05) the performance, carcass yield and bone quality variables. However, performance (feed intake, gain weight, feed conversion), yield (warm carcass weight) and bone quality (dry weight, length, mineral matter and breaking strength) of broilers fed with diets without vitamin D3 in the premix and with addition of 1,25(OH)2D3-glycoside, which was the single source of vitamin D, had as a result very low (P Key words: bone growth; bone strength; calcitriol; poultry; Solanum glaucophylum. portuguesUm experimento foi realizado para avaliar o efeito da diminuicao dos niveis de vitamina D3 no premix e a suplementacao de 1,25-dihidroxivitamina D3-glicosideo (1,25(OH)2D3-glicosideo) sobre o desempenho, rendimento de carcaca e qualidade ossea em frangos de corte de 42 dias. Machos Cobb500® de sete dias de idade foram distribuidos em delineamento inteiramente casualizado com seis tratamentos: uma dieta controle com inclusao de vitamina D3 no premix, sem suplementacao de 1,25(OH)2D3-glicosideo, e cinco dietas com niveis decrescentes de vitamina D3 (100%, 75%, 50%, 25% e 0% em relacao ao controle) mais a adicao de 1,25(OH)2D3-glicosideo (50g ton-1 de dieta). Entre os principais resultados, foi observado que a reducao do teor de vitamina D3 no premix quando adicionado 1,25(OH)2D3-glicosideo nao afetou (P>0,05) o desempenho, o rendimento da carcaca e as variaveis da qualidade ossea. No entanto, as variaveis do desempenho e o rendimento (consumo de racao, ganho de peso, conversao alimentar, peso da carcaca quente) e da qualidade dos ossos (peso seco, comprimento, materia mineral e resistencia a ruptura) de frangos alimentados com dietas sem vitamina D3 no premix, com a adicao de 1,25(OH)2D3-glicosideo como a unica fonte de vitamina D, teve como resultado valores muito baixos (P Palavras-chave: avicultura; calcitriol; crescimento osseo; forca ossea; Solanum glaucophylum

Decreased levels of vitamin D3 and supplementation with 1,25-dihydroxyvitamin D3-glycoside on performance, carcass yield and bone quality in broilers