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This study was conducted to evaluate the production traits and investigate the feeding methods of Arian strain broiler chickens in industrial poultry farms in Mazandaran province. To conduct this study, poultry farms that hatched Arian strain were identified and the performance and production indices of 30 units were recorded up to the age of slaughter. First, a questionnaire containing questions regarding unit characteristics, management, feed rations, feed conversion ratio, mortality percentage, average live weight at the end of the rearing period, length of the rearing period, and production index was prepared. After each of these units hatched, the questionnaires were completed by direct visits, using objective observations, and interviews with the managers of the broiler chicken breeding units. In addition to the statistical description of qualitative data related to the breeding units (management, equipment and supplies used), the mean, standard deviation, range of variation (minimum and maximum) and coefficient of variation were also calculated and reported on the performance traits (feed consumption, mortality percentage, average live weight at the end of the breeding period, length of the breeding period, daily weight gain, feed conversion ratio and production index). In this study, the average breeding period in Arian strain broiler breeding units in Mazandaran province was 42.67 days, feed conversion ratio was 2.06, production index was 228.3, final weight was 2,195 kg and average mortality was 6.6%. The maximum activity experience was 25 years, the highest frequency of bachelor's degrees was 51.6 percent, the sewage disposal system was 82.66 percent, fencing around poultry units with walls was 41.9 percent, carcass disposal system was 70 percent, disease diagnosis was done by laboratory method was 55 percent, vaccination program was developed by a general veterinarian was 50 percent, roof insulation was 75 percent with Unilite, indoor heating system was 80 percent, equipment was equipped with emergency electric motor was 58 percent, nipple drinker was 80 percent, and feed was provided from livestock and poultry factories was 63.34 percent. In general, the results of this study showed that sufficient support should be provided to encourage breeders to develop the Arian strain in poultry units
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