Utilizating various levels of metionine+cystine on rations of laying hens up 45 weeks of age

Abstract

An experiment was carried out in the Aviary of Experimental Farm of Iguatemi of the State University of Maringá (FEI/UEM), with the objective of studying the needs in sulfur amino acids for hens. 200 hens were used above 45 weeks, in 4 cycles of 28 days each. The treatments consisted on a basal ration with 16.0% PB and 2,850 kcal EM/kg, supplement with 5 TSAA levels (0.52; 0.57; 0.62; 0.67 and 0.72%). The variables studied were ration consumption and of TSAA; production, weight, and internal quality of the eggs, weight of the peel of the eggs, specific gravity and feed conversion. The completely randomized design, was used with 5 treatments, 5 repetitions and 8 birds for experimental unit. The data were submitted the regression analysis by the system SAS®. In the conditions in that the experiment was accomplished, there was a growing lineal increase in the medium weight of the eggs, when were increased the levels of sulfur amino acids in the ration. For eggs quality, peel percentage and Haugh units (UH), there was not significant difference (P>0.05). Production of eggs was converted for posture percentage and alimentary conversion (kg/kg and kg/dz), they didn't also have difference (P>0.05).