To investigate the population genetic structure of Keerqin fine wool sheep,the paternal half sib correlation method was employed to estimate the body weight traits,genetic and phenotypic correlation between fleece traits in the Keerqin fine wool sheep. The results showed that the correlation coefficients were0. 690 1,0. 593 1,0. 581 2,0. 210 2 for birth weight with weaning weight,body weight at one week of age,body weight at two week of age,and body weight at three week of age,respectively. The genetic correlations were highly significant( P < 0. 01) for the four pairs of traits. The correlation coefficients were 0. 373 3,0. 274 1,0. 268 2 for weaning weight with body weight at one week of age,body weight at two week of age,and body weight at three week of age,respectively. The genetic correlations were also extremely significant( P < 0. 01) for the three pairs of traits. The correlation coefficients were 0. 712 0,0. 805 0,0. 717 1,0. 701 9,0. 531 6,0. 719 0,0. 681 3 and 0. 521 3 for wool fineness at one week and two week of age,wool fineness at one week and three week of age,staple length and fleece weight at one week of age,staple length at one week and three week of age,fleece weight at one week of age and wool fineness at three week of age,wool fineness at two week and three week of age,wool fineness at two week of age and fleece weight at three week of age,and fleece weight at two week and three week of age,respectively. The high genetic correlations were extremely significant( P < 0. 01) for the eight pairs of traits. The phenotypic correlations were generally lower than the genetic correlations.
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