Efeito dos níveis de vitamina D3 em premix e suplementação com 1,25(OH)2D3 na ração de frangos de corte

Abstract

This study aimed to evaluate the reduction of levels of vitamin D3 used on commercial premix, and supplementation with 1,25-dyhydroxycolecalciferol (1,25(OH)2D3) on broiler feed from 7 to 42 days and the effect on performance parameters and bone quality. Were raised 1400 male broilers chickens, Cobb, in a randomized design with 6 treatments and 6 repetitions (100%, 75%, 50%, 25% e 0% of vitamin D3 on premix added 50g/ton of 1,25(OH)2D3).The data was submitted to ANOVA, and on case of significant result, the averages compared by the Dunnet test (p <0.05). According to the obtained results were possible to conclude that the performance and bone quality of broilers were affected by the different level reduction’s of vitamin D on premix, supplemented with 50g/ton of 1,25(OH)2D3, being that influence dependent of growing phase. Also, the reduction of 75% on the vitamin level added with 1,25(OH)2D3 was capable of keep the performance parameters (weight, feed conversion, and feed intake) according with recommended parameters from Cobb manual line, and the bone quality similar to control treatment at 21 and 42 days old. The carcass yield and noble cuts weren’t influenced by the reduction of the vitamin level supplemented with 1,25(OH)2D3, however, the utilization of 1,25(OH)2D3 as only source of vitamin D, on the tested quantity, impaired the performance, slaughter weight and carcass, in addition to worsen the bone quality evaluated by ash % and bone resistance to breakage on all ages tested. More analyses, as metabolite or similar dosage on blood and organs would be necessary for attesting the range of effectiveness of 1,25(OH)2D3 on the vitamin D levels tested. As well as an economical evaluation of the vitamin D level reduction and 1,25(OH)2D3 supplementation