兰州大尾羊×小尾寒羊F1代体重和体尺的相关性研究

doi:10.16431/j.cnki.1671-7236.2019.06.008

Abstract

Abstract:

The aim of this study was to investigate correlation between body weight and body sizes of F1 hybrid of Lanzhou Fat-tailed sheep×Small-tailed Han sheep,which could provide scientific theory basis for estimation of weight through its body sizes.In the experiment,80 F1 hybrids of Lanzhou Fat-tailed sheep×Small-tailed Han sheep with 40 lambs of each sex at 150 days of age were selected randomly as objects.The body weight (Y),body length (X₁),body height (X₂),chest circumference (X₃),cannon circumference (X₄),chest depth (X₅),chest width (X₆) of lambs were measured.The phenotypic correlation analysis,path analysis,stepwise linear regression analysis and subdivision of correlation coefficients between the body weight and body sizes of rams and ewes were performed using SPSS 22.0 software.The results indicated that there were extremely significant positive correlations between body length,body height,chest circumference,cannon circumference,chest depth,chest width and body weight of F1 hybrid of Lanzhou Fat-tailed sheep×Small-tailed Han sheep (P<0.01).The correlation degree between chest circumference and body weight was the highest,the correlation coefficients were 0.907 and 0.908 in rams and ewes,respectively.The correlation degree between body length and body weight was followed whose correlation coefficient of rams was 0.875,and that of ewes was 0.844.Extremely significant positive correlations were also found among body sizes traits (P<0.01),in which,the correlation coefficient between chest circumference and body length was the highest.Chest circumference and body length mainly had an effect on body weight by direct action,while chest depth,cannon circumference,body height and chest width mainly affected body weight through indirect effect.The direct impact of chest circumference on body weight was the greatest and the indirect influence of chest depth on body weight was the highest.The optimal regression equation between the body weight and body sizes of rams and ewes were Y=-43.861+0.675X₃+0.394X₁(r=0.945,P<0.01),Y=-38.378+0.590X₃+0.397X₁(r=0.948,P<0.01).In conclusion,chest circumference and body length were two important factors influencing body weight of F1 hybrid of Lanzhou Fat-tailed sheep×Small-tailed Han sheep.In the process of breeding and fattening,the choice of chest circumference and body length should be strengthened while the influence of chest depth,cannon circumference,body height and chest width also should be considered.

Key words: Lanzhou Fat-tailed sheep×Small-tailed Han sheep; body weight; body sizes; correlation; path; stepwise linear regression

CLC Number:

S826

LU Huining, LIU Yanyan, ZHANG Li, JIN Xin, HE Linbo, CAO Xin. Correlation Analyses Between Body Weight and Body Sizes of F1 Hybrid of Lanzhou Fat-tailed Sheep×Small-tailed Han Sheep[J]. , 2019, 46(6): 1628-1635.

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Correlation Analyses Between Body Weight and Body Sizes of F1 Hybrid of Lanzhou Fat-tailed Sheep×Small-tailed Han Sheep

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