برآورد پارامترهای ژنتیکی وزن بدن و خصوصیات لاشه در دو سویه از بلدرچین ژاپنی

In current research, two strains of Japanese quail consisting of 150 wild quail (50 male and 100 female birds) and 150 white quail (50 male and 100 female birds) were used as base population in Aghghala quail station. Four mating groups include group 1 (wild male×wild female), group 2 (white male×wild female), group 3 (wild male×white female) and group 4 (white male×white female) were used for producing progeny. Chicks were weighed and then slaughtered at 35 days of age. After slaughter and removing feathers, carcass seperation was carried out. The internal organs consisting glandular stomach, gizzard, Spleen, liver, heart, bursa fabricius and total digestive system weighed by scale with 0.01g accuracy. The fixed effects of sex, hatch and mating group were investigated. The variance and covariance components and genetic parameters were estimated using multiple animal model and restricted maximum likelihood with ASREML software. Sex and hatch had significant effects on body, carcass and breast weights (P<0.05) but no significant effects on internal organs and total weights of digestive system. The mating group has significant effect on body, carcass and breast weights (P<0.01). The highest and lowest body, carcass and breast weights were observed in group 1 ((wild male×wild female) and 4 (white male×white female), respectively. Except glandular stomach weight, mating group showed no significant effect on internal organs and total digestive system weights. The heritability of internal organs ranged from low to moderate (0.07 to 0.44). These estimates for body, carcass and breast weights were 0.43, 0.61 and 0.66, respectively. Genetic correlation between body weight and internal organ’s weights ranging from -0.24 to 0.29. These estimates for carcass and breast weights were from -0.31 to 0.24 and -0.07 to -0.21, respectively. Genetic correlation between body weight with heart and bursa fabricius weights were estimated negative (-0.24 and -0.12, respectively) which shows selection based on body weight could be reduce heart and bursa fabricius size comparing body size and which conducing to Ascites, sudden death syndrome and weakness of immune system.