Studies On Estimation Of Genetic Parameters Of Growing And Reproducative Traits In Matou Goat

This research sorted and analysed the breeding data from the Shimen foundation seed farm in 2008-2009, Changde, Hunan. Genetic parameters for growth traits and propagation traits of Matou goats was estimated by MTDFREML, and also Logistic model and Gompertz model were applied for growth curve fitting of body weight for Matou goats. MTGSAM was used in gametic imprinting effect analysis of two traits for Matou goats:body weight and litter size. The results were as follows:1. The fitting degree of rams and ewes that obtained from Gompertz model were 0.9945 and 0.9955, which were bigger than the one that obtained from Logistic model respectively. It showed, compared to Logistic model, Gompertz model had a better performance in growth curve fitting of body weight for Matou goats. The growth inflexion of rams and ewes that obtained from Logistic model were (9.69,25.83) and (9.25,22.92), the one that obtained from Gompertz model were (6.75,25.33) and (6.60,21.30).2. MTDFREML was used in genetic parameters estimation for growth traits and propagation traits of Matou goats, the results were:the heritability of body weight, height, slanting length, chest circumference and cannon circumference were 0.34, 0.39,0.31,0.37 and 0.29 respectively. The result of estimation showed the correlations between the five traits were high, and were strong positive correlation.The results of estimation of heritability for propagation traits were:the heritability of birth weight, weaning weight, litter size, number of lambs born alive, weaning weight of litter and weaning size were:0.17,0.19,0.10,0.15,0.21 and 0.23 respectively. The genetic correlation between the birth weight, weaning weight and the other propagation traits mostly were weak positive correlation or negative correlation. The genetic correlation between the litter size, number of lambs born alive, weaning weight of litter and weaning size were strong positive correlation.3. For the body weight of Matou goats, estimates of the proportion of total variance accounted for by paternally and maternally transmitted gametes were 2.8% and 4.5% respectively. For the litter size, estimates of the proportion of total variance accounted for by paternally and maternally transmitted gametes were 1.1% and 2.3% respectively. The results showed, for the body weight, variance components of maternal gametic effects were obviously bigger than that of paternal gametic effects; For the litter size, variance components of maternal gametic effects were about twice than that of paternal gametic effects.