| In this study, postal development law of Hu sheep, genetic diversity of microsatellite loci and correlation between microsatellite loci and early growth traits of Hu sheep were investigated for two objectives: 1. To build up a core flock of rapid-growth-type Hu sheep; 2. To find out possible DNA markers that related to early growth traits of Hu sheep and analyze whether QTLs that affect growth traits exsit.1 The Fitting of Growth Curve and Effects on Growth of Hu SheepBertalanffy model was best in fitting the growth curve of Hu sheep among the three nonleaner models (Logistic, Bertalanffy and Gompertz). Then the growth development of Hu sheep was fitted with Bertalanffy model for different sex, different female groups and different weaning age groups, and the results indicated that it was affected significantly by sex, selection and weaning age. Inflective age, body weight and growth rate were increased though postponing weanling age, which may benefit the econmic value of Hu sheep for meat production, as well as alleviate the negative effect of weanling stress on growth rate; Adult body weight were also increased which may improved the breeding performance of Hu sheep. Futhermore, intensive selection resulted in an earlier inflective age, which consequently reduced the weanling stress on body weight gain.2 The Polymorphism Analysis of Six microsatellite Loci on Chromosome 2 of Hu SheepThe polymorphism of six microsatellite loci on chromosome 2 were analyzed for 263 Hu sheep. The result showed that the number of alleles for each microsatellite locus ranged from 7 to 9, and the length of them ranged from 96 to 202bp. The heterozygosity (H)and polymorphic information content (PIC)of 6 microsatellite loci were 0.7674～0.8432 and 0.7648～0.8404, respectively, with the highest and the smallest loci of BMS1591 and ILSTS30, respectively. It indicated that the six microsatellite loci we chosed were high polymorphic markers and can be effectively used to analyze the genetic diversity of Hu sheep.
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