Analysis of Growth Curve of High Quality Lines of Hubei White Pig

[Objective] The study was to understand the growth and development law and growth potential in different growth stages of high quality lines of Hubei white pig.[Method] The growth and development condition of 102 high quality lines of Hubei white pig in 2 generations from birth to 20 days old,50 days old and during their body weight at 25-90 kg were detected.The growth curve were fitted and analyzed with Logistic and Gompertz equation to derive the correction formula on days old when body weight of the pig reached 90 kg.[Result]The equations of Logistic and Gompertz all could fit the growth curve of high quality lines of Hubei white pig and the fitting degrees of the 2 equations were 0.971 0 and 0.976 0 resp.The growth of high quality lines of Hubei white pig was fastest at about 122 days old.In curve model,the parameter A which represented weight limit had bigger difference among various individual of the same variety,the days old parameter lnb/k which represented the biggest value of growth also had bigger difference.The days old when the body weight of high quality lines of Hubei white pig in first two generations reached 90 kg was(186.00±25.09)d.[Conclusion]The inflexion of growth curve of high quality lines of Hubei white pig fitted by Gompertz equation was(121.59,52.13),and the biggest daily weight gain of the pig was 657.00 g/d.