Abstract:

To master the distribution regularity of Rex rabbit’s weight in different ages and seasons，and understand season’s impact on growth of Rex rabbits at different ages，growth data of Rex rabbits was allotted into 12×8 order matrix(season×age)，curve surface fitting tool of matlab2010a was adopted，multiple comparison between weights in different seasons was carried out.The results showed as follows：the obvious pit of weight distribution located between July to October and 91- to 180-day-old，difference between extreme weights at this stage achieved significant level (P<0.05)，and the difference of weight was up to 500 g approximately.And then，ridgy area of distribution was located in February to April and approximate 200-day-old，weight distribution present twin-peaks prior to approximate 56-day-old，and then single peak ；weight distribution of Rex rabbit born in different seasons demonstrated that rabbits born in summer gained maximal weight during 91 to 210 days，minimum weight was gained by rabbits born in the spring；daily gain surface distribution showed twin-peaks，which included endogenous growth and the compensation growth，peaks presented saddle-shape，the bottom of saddle was located in the summer.The first peak was presented in August，and the second peak was presented in June.The results indicate that the summer is the main season affecting the growth of Rex rabbits，and the suppression role almost involve in the whole age stages，winter mainly inhibit growth of rabbits before
56-day-old；rabbits own classical compensation growth ability，and the more serious impact of season on the first growth peak，the stronger compensation growth；Bivariate polynomial five times，which display better fitting effect，is suitable for growth prediction and exploration of the growth rule.