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CAETANO, V. C. Determination of digestible lysine requirements for male broilers. 2017. 70 p. Thesis (Doctorate) – Faculty of Animal Sciences and Food Engineering, University of São Paulo, Pirassununga, 2017. The objective of the present study was to evaluate the optimal levels of digestible lysine in the diet of male broilers, evaluating performance characteristics, body composition, and carcass yield of the animals. Two trials were carried out to assess the stages from 1 to 21 and 1 to 42 days of age (assay 1), and from 22 to 42 days of age (assay 2). The diets differed in digestible lysine content, maintaining the relation among the other amino acids and lysine in accordance with the ideal protein concept. The six levels of digestible lysine in the diet of animals up to 21 days of age were: 1.026%; 1.125%; 1.225%; 1.324%; 1.423%, and 1.523%; and after 21 days of age: 0.877%; 0.961%; 1.046%; 1.131%; 1.216%, and 1.301%. A total of 1296 animals were employed in each of, distributed in 36 experimental units of 36 birds each. The determined performance characteristics corresponded to feed intake, body weight, weight gain, feed conversion, viability, and productive efficiency index (except for animals from 1 to 21 days of age). At 21 days of age (assay 1) and 42 days of age (assay 1 and 2), seven birds per experimental unit were selected at random, five for the estimation of yield and total carcass and commercial cut weight, and two for the evaluation of body composition. The commercial cuts consisted of breast, thigh, drumsticks and wing. Regarding body composition, dry matter, ethereal extract, ash, and crude protein content were calculated. The data were submitted to variance analysis, and when significant differences were observed, the means were compared using the Tukey test. The estimation of digestible lysine requirements was performed applying linear or quadratic regression models. Feed conversion was influenced in every phase, and its requirement was greater than for weight gain. The requirements for feed conversion were 1.374%; 1.243%, and 1.301% for phases from 1 to 21, 1 to 42, and 22 to 42 days of age, respectively. Digestible lysine only affected animal breast yield during the ages from 1 to 42 and 22 to 42 days of age, with requirements of 1.200% and 1.301%, respectively. At ages ranging from 1 to 21 days and 1 to 42 days of age, differences in protein deposition in the carcass were observed, displaying superior levels at 1.305% and 1.262%, respectively. With respect to nationally known recommendations regarding digestible lysine, higher levels of the amino acid in the diet have brought benefits regarding animal feed conversion, breast yield, protein deposition, and body fat.

Determinação das exigências de lisina digestível para frangos de corte machos