Arquivo Brasileiro de Medicina Veterinária e Zootecnia (Apr 2013)
Suplemento de 1,25 dihidroxicolecalciferol e redução de cálcio e fósforo disponível para frangos de corte Supplement of 1,25-dihydroxycholecalciferol and reduction of calcium and available phosphorus in broiler chickens
Abstract
Avaliaram-se o desempenho e o rendimento de carcaça e cortes nobres de frangos de corte machos com suplemento nas rações de 1,25 dihidroxicolecalciferol e redução de cálcio e fósforo disponível. Foi utilizado um delineamento em blocos ao acaso, com seis tratamentos: 0,0; 1,0; 2,0; 3,0; 4,0 e 5,0µg de vitamina D3 ativa/kg de ração, e seis repetições com 17 aves cada. Aos 8 e 42 dias de idade cada unidade experimental foi pesada para avaliação do desempenho. Posteriormente, quatro aves/repetição foram retiradas e abatidas para mensuração do rendimento de carcaça e de cortes nobres. A inclusão da vitamina D3 ativa influenciou positivamente (PThere were evaluated the performance, the carcass yield and noble cuts yield of broilers with supplement of 1,25-dihydroxycholecalciferol and reduction of calcium and available phosphorus. It was used a randomized block design, with six treatments: 0.0; 1.0; 2.0; 3.0; 4.0 and 5.0µg of active vitamin D3/kg of ration, and six repetitions with 17 birds each. At 8 and 42 days of age each experimental unit was weighted in order to evaluated the performance. Later, four broilers/repetition were removed and slaughtered in order to measure the carcass and noble cuts yield. The inclusion of active vitamin D3 influenced positively (P<0.05) the weight gain and the feed conversion at the supplementations of 1.0 and 2.0µg/kg. The feed intake wasn't significative among the studied levels. The carcass and noble cuts of male broilers at 42 days were not influenced by supplement of 1,25-dihydroxycholecalciferol and reduction of calcium and available phosphorus in rations. It is recommended to provide additional of 1.0 up to 2.0µg/kg of active vitamin D3 in rations for male broilers from 8 to 42 days of age.
