关键词: 杂交组合, 生长曲线, Gompertz模型, 川南山地黄牛

Abstract: 【Objective】 This study was aimed to screen out the optimum performance hybridized combinations for beef cattles in Three Gorges Reservoir Area.【Method】 The body sizes and weights of 4 crossbred beef cattle breeds including Simmental × Simmental × Chuannan Mountainous cattle (SSC),Red Angus × Red Angus × Chuannan Mountainous cattle (RRC),Red Angus × Simmental × Chuannan Mountainous cattle(RSC),and Simmental × Red Angus × Chuannan Mountainous cattle (SRC) were measured and analyzed periodically from birth to 24 months of age. Growth curve fitting analysis was performed.【Result】 The results showed that body weights of SSC and RSC at birth and 24-month-old were significant higher than that of RRC and SRC. There was no significant difference in body weight of 12 months of age among four cattle breeds. Moreover,there were no significant differences in body heights and level body lengths at birth ,12 months and 24 months of age among four breeds. Body height and level body length of SSC at 6 months of age were significantly different from those of RRC and RSC（P<0.05）. Heart girths of SSC and RSC at 24 months of age were higher than those of RRC and SRC（P<0.05）.There was no significant differences in heart girths at birth and 12 months of age among four breeds. The growth curves of all the 4 cattle breeds fit the Gompertz growth model (fitting degree > 0.95). RSC had maximum mature weight,level body length and heart girth. The average daily gain of RSC was the highest among four breeds at 12 months of age.【Conclusion】 SSC and RSC had the relatively higher growth performance than the other breeds in Three Gorges Reservoir Area,indicating they are optimal hybridized combinations for the beef cattle breeding.

Key words: cross combination, growth curve, Gompertz growth model, Chuannan Mountainous cattle