Determinação do segundo aminoácido limitante para codornas japonesas nas fases de cria e recria

Abstract

The objective of this study was to determine the second limiting amino acid for Japanese quails (Coturnix coturnix japonica) during the growth phase. The experiment was conducted at the Poultry Section of the Center for Agricultural Sciences, Campus II of the Federal University of Paraíba, located in Areia, PB, from September 2012 to April 2013 Two experiments were conducted with Japanese quail (Coturnix coturnix japonica), females, according to the phases of bird life (creates and recreates). In the first experiment 480 quail one day of age were individually weighed and allocated to eight treatments and five replications of twelve birds each were used. In experiment II 480 quails with 22 days of age were individually weighed and allocated to eight treatments and five replications with twelve birds were used. Treatments in both experiments consisted of reduction of crude protein and supplemental DL-methionine plus essential amino acid L-T1 (Methionine); T2 (T1 + Lysine); T3 (T1 + threonine); T4 (T1 + Tryptophan); T5 (T1 + Valine); T6 (T1 + Arginine); T7 (T1 + isoleucine) and T8 (T1 + All). The feed intake of Japanese quail 1-21 and 22-42 days of age were not affected by different limiting amino acids in the diet. Weight gain and feed conversion were influenced in phases 1-21 and 22-42 days of age. When they met the methionine and lysine birds had a higher weight gain and better feed conversion. Thus, it is concluded. That lysine is the second limiting amino acid for Japanese quails raising and growth.