Economic performance in a productive unit has the basic important role for each breeding system. It is important to know the contribution of economic values in the breeding objective for sheep under traditional management in order to design appropriate breeding schemes for them. Economic values were calculated for fourteen traits of Kurdi sheep breed of Iran by using bio-economic model in this study. A farm of 100 ewes with traditional management and close breeding system were considered as a model for one year. The traits considered were live weight of ewe, pregnancy rate, litter size, birth weight, number of lambs before weaning, weaning weight, average daily gain before weaning, weight at 6 months, average daily gain after weaning, number of lambs after weaning, fleece weight, replacement rate, long breeding life and feed consuming. The economic values indicate that average daily gain before weaning, litter size, pregnancy rate of ewe and feed consuming are likely to be important traits in Kurdi sheep breed. Traits such as number of lambs before weaning, weaning weight and birth weight had positive economic values and traits of weight at 6 months, average daily gain after weaning and number of lambs after weaning had zero economic values. Feed consuming, replacement rate of ewe, live weight of ewe and fleece weight had negative economic values, consequently. Keywords: Economic values, Bio-economic model, Kurdi sheep breed.

Economic performance in a productive unit has the basic important role for each breeding system. It is important to know the contribution of economic values in the breeding objective for sheep under traditional management in order to design appropriate breeding schemes for them. Economic values were calculated for fourteen traits of Kurdi sheep breed of Iran by using bio-economic model in this study. A farm of 100 ewes with traditional management and close breeding system were considered as a model for one year. The traits considered were live weight of ewe, pregnancy rate, litter size, birth weight, number of lambs before weaning, weaning weight, average daily gain before weaning, weight at 6 months, average daily gain after weaning, number of lambs after weaning, fleece weight, replacement rate, long breeding life and feed consuming. The economic values indicate that average daily gain before weaning, litter size, pregnancy rate of ewe and feed consuming are likely to be important traits in Kurdi sheep breed. Traits such as number of lambs before weaning, weaning weight and birth weight had positive economic values and traits of weight at 6 months, average daily gain after weaning and number of lambs after weaning had zero economic values. Feed consuming, replacement rate of ewe, live weight of ewe and fleece weight had negative economic values, consequently. Keywords: Economic values, Bio-economic model, Kurdi sheep breed.

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