Suplementação extra de arginina, triptofano e valina em dietas para frangos de corte sobre o desempenho e rendimento de cortes

Abstract

Amino acids are basic organic units that are part of the proteins. A total of 22 amino acids are known, 10 of which are considered essential for birds. Thus, this research aimed to evaluate the increase in performance and yield of chicken cuts through the use of higher concentrations of arginine, tryptophan and valine, in addition to the economic evaluation od diets. A total of 900 (one-day-old) male chicks of Cobb 500 commercial lineage, were distributed in a randomized complete block design, with six treatments and 10 replications. The treatments were: T1- diet for superior performance (positive control); T2- (T1 + 15% arginine); T3- (T1 + 15% tryptophan); T4- (T1 + 15% valine); T5- (T1 + 15% arginine + 15% tryptophan + 15% valine); T6- diet for regular performance (negative control). The experimental period was 42 days, the first four days of adaptation of birds to diets and the environment. Tukey test at 5% probability was used for comparison of the treatment means. The variables average initial weight, average final weight, average daily weight gain, average daily feed intake and feed conversion were obtained every 14 days. The weighing of birds and diets were performed weekly. At the end of the 42nd day, 240 birds were slaughtered (40 birds per treatment). Live weight, warm carcass weight, head weight with neck, wings weight, thigh weight, drumstick weight, breast weight, back weight and foot weight were collected for cutting yield analysis. For carcass composition analysis, 10 animals were collected per treatment. No significant difference among the treatments were observed for any of the variables. The economic analysis of the diets showed a significant increase in the production cost when amino acids were included. Based on the results obtained, it can be concluded that diets with higher levels of the amino acids arginine, tryptophan and valine, and the positive control diet, did not show any improvement in the variables analyzed, making the regular performance diet (negative control) the most feasible, zootechnically and economically.