Estimation of economic indices for some important Production traits of karakul (fars grey) sheep

In this research, the statistical data related to karakul (fars grey) sheep that were collected during years 1986 to 2001 by national animal breeding center, were used to estimate the economic coefficient for 15 traits including: birth weight (bw), weaning weight (ww), weight on six month (wsm), weight on nine month (wnm), weight on one year (woy), colour of skin (cs), skin flower type (cft), rate of skin flower type (rsft), concession of skin flower type (csft), extent of skin flower (esf), diameter of skin flower (dsf), radiation and luminosity of skin (rls), scheme and harmony of skin flowers (shsf), skin size (ss) and skin thickness (st) for 7 distinct animal group in 3 herds of this breed in Abadeh, Marvdasht and Fasa townships in fars province. The economic indices of traits were estimated through applying system analysis method,via partial derivation of profit function in relation to the considered trait. Then, sensitivity of the model to changes in each parameter in the model was calculated. Among Skin and weight traits, the highest economic coefficient was related to weaning weight trait and skin thickness trait. Also, it was observed that the increase in costs and the decrease in productions price (by ±20% from base condition) lead to reduction of relative economic indices with regard to base condition and the decrease in costs and the increase in productions price lead to increase of relative economic indices with regard to base condition. Finally, According to the results obtained in this study, a selection index was determined based on market condition in this breed of sheep. hisbreed of sheep this breed of sheep this breed of sheep is breed of heep.