Agentes antioxidantes na reprodução de matrizes pesadas

• Autor(a) principal: Gonçalves, Fernanda Medeiros
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFPel - Guaiaca
• Texto Completo: http://repositorio.ufpel.edu.br/handle/ri/2608
• topic: Economase; Estresse oxidativo; Fertilidade; Galos pesados; Economase; Oxidative stress; Fertility; Roosters; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA

The aim was to evaluate the effects of an antioxidant blend on rearing performance, biochemical profile and reproductive parameters of heavy roosters. A total of 210 Cobb male chicks were split in groups of seven birds and placed in 40 boxes. Diets provided were based on corn and soybean meals and treatments were attributed in a randomly design where Control (C) were represented by the group fed only with the basic diet; and Antioxidant Blend (BA), were fed with the basic diet added 20g/Kg of meal of the supplement. Performance data were obtained during all experimental period and blood samples were performed in three periods: 5, 10 and 20 weeks old. Body weight, body weight gain (BWG), feed conversion and coefficient of variation were the performance parameters. Biochemistry markers were represented by albumin, total proteins, triglycerides, cholesterol, HDL, VLDL, LDL and uric acid levels. Semen evaluation was performed fortnightly during 20 weeks split in four periods: P1 = 32 a 40; P2 = 42 a 50; P3= 52 a 60; P4 = 62 a 70 weeks old. Treatment C roosters showed higher BWG, worst FC and higher albumin and uric acid serum levels in the first period. In the second period, triglycerides and VLDL levels were lowest in BA treatment. Higher HDL serum levels were observed in BA group at the end of rearing. In the same period, group C roosters showed higher levels of VLDL and uric acid. We observed a increase in semen production in the last periods (P3 e P4) and in comb s weight and area in the BA group, assigning the results to testosterone hormonal modulation due selenium presence in the blend. Results indicate that antioxidant supplementation improve feed conversion and has influence in blood parameters related to oxidative stress during rearing phase. We conclude that supplementation of the antioxidant blend improved indexes related to reproduction performance and has the potential to extend reproductive period in heavy roosters. We suggest new studies in order to evaluate complementary effects of the antioxidant blend supplementation in commercial poultry reproduction.