Nutrientes funcionais em rações de frangos de corte mantidos em ambiente de alta temperatura

• Autor(a) principal: Vaz, Roberta Gomes Marçal Vieira
• Data de Publicação: 2006
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1747
• topic: Ambiente térmico; Nutrição; Aves; Thermal environment; Nutrition; Broilers; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::PRODUCAO ANIMAL

A thousand two hundred male broilers of Cobb strain were used in three experiments to evaluate in animals assigned to high temperatures the effect of functional nutrients (organic chromium, vitamin C and vitamin E) on the performance and noble cuts. In each experiment were evaluated five treatments that were distributed in a randomized experimental design with eight repetitions. The experiments were divided in two periods, from 1 to 21 days and from 1 to 42 days using ten and seven birds per repetition respectively. In both of the periods of experiment 1 was not observed a significant effect of the levels of organic chromium (0; 350; 700; 1050; 1,400 ppb) on weight gain food intake and feed:gain ratio while chromium intake increased linearly. In the total period from 1 to 42 days of age also did not have effect of the treatments on the performance of the birds while chromium intake was influenced by positively linear way. The chromium supplementation did not influence the absolute and relative weights of neither of the cuts evaluated. In the experiment 2 was verified that in the period from 1 to 21 days of age had a linear effect of the vitamin C supplementation (0, 100, 200, 300 e 400 ppm) only on weight gain and vitamin C intake but with no effect on food intake and feed:gain ratio of the animals. The feed:gain ratio was not influenced by the supplementation. In the total period from 1 to 42 days of age had a crescent linear effect on weight gain and vitamin C intake. The food intake and feed:gain ratio answered in a quadratic way with the minimum and maximum point of 146 and 226 ppm of vitamin C respectively. Had a crescent linear effect on the absolute weights of breast and thigh and also on the relative weight (yield, %) of the thigh. It was not observed effect of the treatments on absolute weight of drumstick and the relative weight (yield, %) of breast and drumstick. In the experiment 3 the effect of the supplementation of vitamin E (0, 75, 150, 225 and 300 ppm) in the period from 1 to 21 days of age was not significant on food intake of the animals. While had a linear effect on weight gain feed:gain ratio and vitamin E intake. In the period from 1 to 42 days of age was observed a linear effect on all of the performance characteristics (food intake, weight gain, feed:gain ratio and vitamin E intake) and a quadratic effect on absolutes weights of breast thigh and drumstick that increased until the estimated levels of 207, 195 and 190 ppm of vitamin E in the diet respectively. It was not observed effect of the treatments on relative weights (yield, %) of the breast thigh and drumstick. It was conclude that for male broilers of Cobb strain in the period from 1 to 42 days of age and assigned to high temperatures that a supplementation of until 1400 ppb of Chromium in the diet did not influence the performance and the carcass characteristics of male broilers; the supplementation of 227 ppm of vitamin C in the diet showed a better answered of feed:gain ratio and the supplementation of until 300 ppm of vitamin E in the diet influenced positively on performance and carcass characteristics.