optimization of methionine level in broiler breeder diets, using of maximized economic profit and multi-criteria decision making methods

an experiment was conducted to determine the appropriate methionine level in broiler breeder’s diet. the treatments consisted of 6 levels of methionine (0.2, 0.25, 0.3, 0.35, 0.4 and 0.45% diets), with 4 replicates of 7 hens each for a duration of 8 weeks and for ages of 28 to 35 weeks. diets contained similar levels of protein metabolizable energy. the levels of the other amino acids were taken equal in all the diets to ensure that methionine was chosen as the only limiting amino acid in each dietal treatment. feed intake, egg production, egg weight, settable eggs, egg mass, feed conversion ratio, egg content and srbc responses were evaluated during the experimental periods. for finding out the optimum methionine level, simple additive weighted (saw) and technique for order preference by similarity to ideal solution (topsis) methods as well as economic maximum equation were employed. application of multi attribute decision making system saw and topsis indicated the appropriate methionine levels as 0.329 and 0.297 percent in the diets, respectively. total methionine content in the diets, for maximum economic profit (according to feed cost and chick value) was recorded as 0.307. results finally indicated that using 0.3-0.33 percent methionine in the arian broiler breeder diets could be approppriately suggested for maximum performance and most economical profit.