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Effects of Different Levels of Methionine Content of Diet on Broiler Breeder Performance

1 Faculty Member, ShahidBahonarUniversity of Kerman, Jiroft, Kerman, Iran
Email: [email protected]
2Professor, Tehran University, Karaj faculty of Agriculture, Karaj, Iran


Iran poultry industry typically pays much money to ship and import Methionine supplements from foreign countries to use in poultry producer feeds. Developing a feeding method which decreases Methionine consumption will benefit local poultry producers. In this project we tried to investigate the effect of different levels of Methionine (80 to 120 percent of requirement) content of diet on broiler breeder flock in a completely randomize design with 5 treatments and 3 replicates in each treatment (17 female and 3 male in each group) of ARYAN broiler breeder from week 50 to 63. We decreased Methionine content of diet to 80% of standard requirement and wanted to see if the flock's performance decrease or not. If we could get the negative answer, then we would be able to recommend the farmers to decrease Methionine in their feeds to pay less money for this supplement. The flock was fed in 4 periods; starter (week 1 to 4), Grower (week 5 to 16), Developer (week 17-21) and production (week 22-63). The experimental diets were isocaloric but contained various levels of Methionine. In this experiment Egg production (H.D), Egg content, number of settable eggs, Interior quality factor (Haugh unit), Exterior quality factors (egg specific weight and egg shell characters) were measured with the ordinary methods. Due to the result of this experiment, different levels of Methionine content of diet has significant effect on egg production (EP %) and egg shell thickness (P<0.05). But Egg content (EC %), number of settable eggs, Haugh unit, egg specific weight and egg shell percent were not affected by Methionine content of diet (P>0.05). Generally, the response of poultry to different levels of sulfur containing amino acids content of diets depends on the protein level of diet. In production period, the recommended level of protein for ARYAN broiler breeder is 17% which means 24.25 gram protein consumption per day for each bird andit seems that 0.53% sulfur containing amino acids content of diet (0.27% Methionine) can support the acceptable performance and increasing the Methionine level of diet more than 0.53% will not benefit the poultry producers and just increases the poultry production expenses. The 0.53% level of sulfur containing amino acids content of diet provides about 770 mg Methionine and Cysteine for a bird which consumes about 145 gr foods per day. It is also demonstrated as the age of flock increases, the mean value of limiting amino acids consumption, decreases and this is directly related to ratio of egg production. A comparative study of the results of this research with other studies indicates that:

  • Due to this fact which the age of the experimental flock was high, a low requirement of Methionine is reasonable.
  • Some small differences between the results of this study and other research are based on difference of protein level of diet and age of flock.
Source : IPSACON-2005
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