Inbreeding and Inbreeding Depression in Iranian Moghani Sheep Breed

The objective of this study was to determine the inbreeding depression on growth traits in Moghani sheep. Pedigree information of ۸۸۳۶ animals collected during the years of ۱۹۸۷ to ۲۰۰۶ by Moghani Breed Center in Jafar Abad Moghan, were used for analysis. The base population year was ۱۹۸۸. Analysis of the records was performed by ASReml software. Inbreeding depression was estimated as the regression of performance on the individual inbreeding coefficients via fitting an animal model. The mean inbreeding for all animals, females and males, were ۰.۵۰۰, ۰.۵۱۵ and ۰.۴۸۴ %, respectively. Totally, ۲۴.۲۲ % of all the animals were inbred. The mean of inbreeding for inbreed animals was ۲.۰۶۲ %. The rate of increased inbreeding per year for all animals was ۰.۰۵%. The inbreeding depression for body weight traits at birth, ۳, ۶, ۹ and ۱۲ months of age was , respectively, -۰.۰۰۷, - ۰.۲۹۱, - ۰.۰۲۶, -۰.۰۱۸ and -۰.۰۴۱ kg, per ۱% increase in individual coefficient.