Níveis de lisina digestível em planos nutricionais para frangos de corte em diferentes ambientes térmicos

• Ano de defesa: 2013
• Autor(a) principal: Silva, Amanda Dione
• Orientador(a): Donzele, Rita Flávia Miranda de Oliveira
• Banca de defesa: Brumano, Gladstone
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Frangos de corte; Desempenho; Ambiente
• Palavras-chave em Inglês: Broilers; Performance; Environment
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::PRODUCAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5768

Two experiments were conducted to evaluate the effect of different nutritional plans with sequences of digestible lysine levels on performance and on carcass characteristics of broilers from 1 to 46 days of age maintained in thermoneutral and heat stress environment. In each experiment, 360 male chicks Cobb were distributed in a completely randomized design with five treatments, represented by nutritional plans (1,12-1,02-0,93-0,89; 1,17-1,07-0,98-0,94; 1,22-1,12-1,03-0,99; 1,27-1,17-1,08-1,04 e 1,32-1,22-1,13-1,09% of digestible lysine, from 1 to 10, 11 to 23, 24 to 40 and 41 to 46 days, respectively), nine replicates and eight birds per experimental unit. In experiment 1, the birds were maintained in climatic chambers with controlled air temperature and relative humidity in order to characterize a thermoneutral environment and in experiment 2 (heat stress environment), the air temperature and relative umidity were 34,5 ± 1,01 ºC e 70 ± 5,5 %, from 1 to 23 days and of 31,7 ± 0,58 ºC e 67 ± 4,2 %, from 24 to 46 days, respectively. The birds received the experimental diets and water ad libitum throughout the experiment. The feed intake (FI), weight gain (WG) and feed conversion (FC) were evaluated in the period of 1 to 23 and 1 to 46 days of age of the birds. At the end of the experimental period (46 days), the birds were slaughter and the carcasses were eviscerated, weighed and subjected to cuts. In experiment 1 there was no effect of nutritional plans on FI of birds in any of the periods. The nutritional plans affected the WG and FC, whereas the plans 4 and 5 provided the best results. Effect was observed of nutritional plans on the absolute weight of carcass, breast, thigh and drumstick and on the relative weight of the drumstick, where the best responses were also observed in broilers that received the corresponding diets to plans 4 and 5. In experiment 2, there was no effect of nutritional plans on FI of birds from 1 to 23 days, but the WG and FC of broilers were influenced, whereas the plans 4 and 5 provided the best results. There was no effect on FI, WG and FC for broilers from 1 to 46 days. There was no effect of nutritional plans on absolute and relative weight of carcass and on absolute weight of breast, but the relative weight of breast varied, whereas the broilers that received the nutritional plan 1 showed the best results. Effect was observed of nutritional plans on the absolute and relative weight of thigh and drumstick of the broilers, in that the nutritional plan 2 provided satisfactory results. It was conclude that the nutritional plan 4 (1,27-1,17-1,08-1,04% of digestible lysine) meets the requirements of digestible lysine for best results of performance, carcass and prime cuts of broilers from 1 to 46 days old maintained in thermoneutral environment. In heat stress environment the nutritional plan 1 (1,12; 1,02; 0,93; 0,89% of digestible lysine) meet the nutricional requirements of performance and relative weight of carcass and breast of the birds, while the nutritional plan 2 (1,17; 1,07; 0,98 e 0,94% of digestible lysine) was sufficient to optimize muscle deposition in thigh and drumstick of broilers from 1 to 46 days old.