Ghavi Hossein-Zadeh Navid
Department of Animal Science, Faculty of Agriculture, University of Guilan, P.O. Box 41635-1314, Rasht, Iran.
Trop Anim Health Prod. 2012 Mar;44(3):531-6. doi: 10.1007/s11250-011-9930-1. Epub 2011 Jul 26.
The objective of the present study was to estimate genetic changes of body weight at different ages in Moghani sheep. Traits included were birth weight (BW, n = 4,208), 3-month weight (3MW, n = 4,175), 6-month weight (6MW, n = 3,138), 9-month weight (9MW, n = 2,244), and yearling weight (YW, n = 1,342). Data and pedigree information used in this study were collected at the Breeding Station of Moghani sheep during 1989-2005. The analysis was carried out for five traits, using the MTGSAM program. Breeding values of individual animals were obtained from a multivariate animal model analysis and genetic trends were obtained by regressing the means of predicted breeding values on year of birth for each trait. Direct genetic trends were positive and significant (P < 0.05) for BW, 3MW, 6MW, 9MW, and YW and were 1.63, 69.20, 79.38, 66.83, and 110.22 g/year, respectively. Also, maternal genetic trends for BW, 3MW, 6MW, 9MW, and YW were positive and significant (P < 0.05) and were 2.36, 49.18, 37.33, 17.73, and 9.67 g/year, respectively. The results showed that improvement of body weights of Moghani sheep seems feasible in selection programs.
本研究的目的是估计莫加尼绵羊不同年龄阶段体重的遗传变化。所包含的性状有出生体重（BW，n = 4208）、3月龄体重（3MW，n = 4175）、6月龄体重（6MW，n = 3138）、9月龄体重（9MW，n = 2244）和周岁体重（YW，n = 1342）。本研究使用的数据和系谱信息于1989 - 2005年在莫加尼绵羊育种站收集。使用MTGSAM程序对五个性状进行了分析。通过多变量动物模型分析获得个体动物的育种值，并通过将每个性状预测育种值的均值对出生年份进行回归得到遗传趋势。BW、3MW、6MW、9MW和YW的直接遗传趋势为正且显著（P < 0.05），分别为每年1.63、69.20、79.38、66.83和110.22克。此外，BW、3MW、6MW、9MW和YW的母本遗传趋势也为正且显著（P < 0.05），分别为每年2.36、49.18、37.33、17.73和9.67克。结果表明，在选择计划中提高莫加尼绵羊的体重似乎是可行的。
