부산대학교 도서관

This experiment was conducted with local Sinai laying hens to determine the requirements of methionine ( Meth ) and total sulfur amino acids ( TSAA ) supplementation to layer diets with four levels of Meth ( 0, 0.05, 0.10 and 0.15%) which offer 0. 29 (negative control) , 0.34 (positive control) , 0.3 8 and 0.44 % Meth corresponding to 0.55 , 0.6 0 , 0.65 and 0.70 %TSAA . The studied traits were laying performance, egg quality, reproductive traits, blood parameters , nutrients digestibility and economic efficiency. A total number of 132 local Sinai birds (120 ♀ + 12 ♂ ) were used in a completely randomized design with 4 treatments ( 3 replicates per treatment ). from 42 - 58 weeks of age. T he results indicated that change in body weight of hens fed diets containing 0. 44 % Meth ( 0.70 %TSAA) was significantly higher than hens fed 0. 29 % Meth and 0.55%TSAA throughout the whole experimental period. E gg production was significantly increased by using 0.34 % and 0.38%Meth (0.60% and 0.65%TSAA, respectively). Egg mass of hens receiving diet supplemented with 0. 3 4 % Meth (0.6%TSAA) was significantly higher than egg mass of hens receiving diet with 0. 29 % Meth (0.55%TSAA). The best feed conversion ratio obtained by feeding hens diet containing 0.34% Meth (0.6%TSAA). Egg weight and e gg quality was not affected by the different levels of Meth and TSAA except HU where the high level of Meth (0.4 4 %) significantly increased HU compared to the negative control .The diets containing different levels of Meth of 0.3 4 , 0.3 8 and 0.4 4 % tended to improve fertility, hatchability of eggs set and chick weight compared to negative control. The best chick weight obtained from birds fed 0.34 Meth (0.60%TSAA ). A ll nutrients digestibility and blood parameters were not affected by the different levels of Meth and TSAA . Economic efficiency (EE ) was insignificantly improved by hens fed diet with 0.3 4 Meth (0.6 0 %TSAA) while increasing Meth to 0. 4 4 % (0. 70 % TSAA) significantly decreased EE compared to negative control. It could be concluded that the requirements of Meth were 0.3 4 % Meth (0.6 0 % TSAA) for maximum egg production , reproductive traits and EE from 42 to 58 weeks of age for Sinai laying hens. [ABSTRACT FROM AUTHOR]