Determination of methionine requirements of Arian broiler chickens by using performance responses in the starter period

Document Type : Research Paper

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Abstract

In order to determination the methionine requirement of Arian broilers chickens during the starter period, a trial with 700 broiler chickens in a completely randomized design with 7 treatments, 5 replicates and 20 chicks in each experimental units was performed. Experimental groups were consisted of 0.38, 0.43, 0.48, 0.53, 0.58, 0.63 and 0.68  % of methionine. Other amino acids provided higher than the recommendation. Broken line equations were used to determine the methionine requirement. Body weight at the age of 7 and 14 days, with weight gain and FCR during days 0-7 and 0- 14days were affected by different levels of methionine (p<0.05). Broken line models were fitted only for FCR at the age of 7 days. Methionine requirement for this period were 0.51 %. The feed and product prices (live weight) were used by order of maximum benefit to determining methionine requirement. Methionine requirement for this method were 0.55 percent

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