Research on Crossbreeding Effect and Path Analysis of Qinchuan Cattle in Guyuan Ningxia
In this study,the effects of crossbreeding of Angus cattle to improve Qinchuan cattle were investigated,taking the adult female Anqin cattle(Angus ♂× Qinchuan ♀)and female Qinchuan cattle as research object.Its body weight was evaluated by body size traits,and the effects of body size traits on body weight of Qinchuan cattle and Angus cattle were analyzed.Data of five body size of 47 female Anqin cattle and 152 adult female Qinchuan cattle were collected,including height at withers,body length,heart girth,hip width,pin bone width,and their weight were also measured.Multiple linear regression equations were established by stepwise multiple linear regression.Then the direct and indirect effects of each body size on weight were calculated by path analysis.The results suggested that Anqin female cattle outper-forms Qinchuan female cattle in three indicators of weight,heart girth and pin bone width(P＜0.01);compared with Qinchuan female cattle,Anqin female cattle's weight,pin bone width,heart girth and hip-width increased by 13.0％,9.9％,3.5％and 3.3％respectively.The multiple linear regression equations of Anqin and Qinchuan female cattle weight and body size are respectively Y=-912.849+4.899X1+3.866X3 and Y=-718.128+1.881X2+2.995X3+4.386X4+5.057X5(Y is body weight(kg),X1 is height at withers(cm),X2 is body length(cm),X3 is heart girth(cm),X4 is hip width(cm),X5 is pin bone width(cm));the direct effect of bust on body weight is greater than the direct effect of other body size traits.In conclu-sion,Angus cattle has a significant effect on Qinchuan cattle hybridization,and the multiple linear regres-sion equations can be used for selective breeding in Anqin and Qinchuan female cattle,and the dominant factor of impacting the weight of Anqin female cattle and Qinchuan female cattle is the heart girth.
Qinchuan cattleAnqin cattlecrossbreeding and improvingpath analysis
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