Associação de cantaxantina e 25-hidroxicolecalciferol na alimentação de frangos de corte

• Autor(a) principal: Bonamigo, Douglas Vanderlei
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Manancial - Repositório Digital da UFSM
• Texto Completo: http://repositorio.ufsm.br/handle/1/11549
• topic: Antioxidantes; Coloração de carcaça; Qualidade óssea; Antioxidants; Black bone syndrome; Bone quality; Carcass coloration; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA

The study was conducted at the experimental aviary of broiler chickens in the Poultry Laboratory (LAVIC) at the Federal University of Santa Maria (UFSM), Brazil. The objective of the study was to evaluate the effect of Canthaxanthin associated with 25-hydroxycholecalciferol (25-OH-D3) in the feed of broilers. The research was divided into two experiments, one with males and the other with females. In the first experiment were used in 1500 one-day-old Cobb-500TM males were distributed in a completely randomized design, totaling two treatments with fifteen replicates of 50 birds each. In the second experiment were used in 1680 one-day-old Cobb-500TM females were distributed in a completely randomized design, totaling two treatments with fifteen replicates of 56 birds each. For both experiments the treatments were: Treatment one (control diet) and Treatment two (control diet + Canthaxanthin associated with 25-OH-D3 added in diet up to 21 days of age). The experimental phase comprised a continuous period of 42 days for the experiment with males and 43 days for the experiment with females, after the birds were slaughtered for performing laboratory tests. The parameters measured were, production performance (weight gain, feed intake, feed conversion and carcass yield and cuts), physicochemical characteristics of carcass (pH, color, water-holding capacity, shear force, cooking loss, lipid oxidation of meat at different shelf times 0, 30, 60 and 90 days "post-mortem" and paw pigmentation), bone characteristics (Black Bone Syndrome, Gait Score, tibial rupture strength and percentage of calcium, phosphorus, and ashes of the tibia). For both experiments the data were submitted to analysis of variance using the statistical program SAS. For the experiment with males, significant results were found for dietary supplementation with Canthaxanthin + 25-OH-D3, where they presented better (P<0.05) body weight gain in the periods of 1-14 and of 1-21 days of age. Besides that, at 42 days of age presented higher (P<0.05) content of yellow in the breast meat, greater (P<0.05) paw pigmentation and greater (P<0.05) tibial rupture strength when supplemented with Canthaxanthin + 25-OH-D3 in the diet. For the experiment with females significant results were found for the variables of carcass coloration, where females supplemented with Canthaxanthin + 25-OH-D3 in the diet in the period of 1-21 days of age presented a higher (P<0.05) red (a*) and yellow (b*) content in the breast meat when slaughtered at 28 days of age. When they were slaughtered at 43 days of age, they presented only higher (P<0.05) breast yield in relation to the control group. It was concluded that males supplemented with Canthaxanthin + 25-OH-D3 in the diet of 1-21 days of age, presented better body weight gain in the initial production period, better breast color and paw pigmentation at 42 days of age and greater rupture force of the tibia. Females supplemented with Canthaxanthin + 25-OH-D3 in the diet of 1-21 days of age presented better breast coloration when slaughtered at 28 days of age, and when slaughtered at 43 days of age presented only higher breast yield.