Abstract
The aim of this study was to determine the effect of M gallisepticum (MG) on performance of commercial layer flocks in Tabriz, Iran. Eight Hy-line W36-strain commercial layer flocks, 4 MG-Free and 4 MG infected-flocks, from two breeding companies were reared in the same condition and compared for production factors during rearing phase and production period. In rearing period, livability and body weight at the age of 17 weeks in MG-infected group were significantly lower than MG-Free group (P<0.05). These factors in both groups were lower than the standard group. Feed intake in rearing period did not differ between the two groups. At production period (18–80 weeks), livability, hen housed egg production and peak production rates in MG-infected group were markedly less than MG-Free group. Overall, the result showed that MG-infected group had lower economic performance.
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