Estimation of genetic parameters and analysis of the effects of non-genetic factors on major economic traits in Suffolk sheep
[Objective]This project aims to estimate the genetic parameters of the main economic traits of Suffolk sheep and to analyze the effects of non-genetic factors on the main economic traits.traits[Methods]In this experiment,a total of 4,156 individual identification records of Suffolk sheep from 2017-2023 in Xin-jiang Manas breeding farm were collected,and the DMU software was used to estimate the genetic parameters of the main economic traits,and the SAS software was used to analyze the effects of five fixed effects,inclu-ding birth type,year of birth,group,litter size,and age of the ewe on each trait.[Results]The heritability of the main economic traits in Suffolk sheep was 0.17,0.27,0.31 in birth weight,weekly weight and chest circumference,respectively,while the heritability of 0.05 for daily weight gain was low,and the heritability of 0.38 for body height and 0.41 for body length were high,except for the negative correlation of chest circum-ference with body height and body length,the other traits showed positive correlation and the correlation of body height and chest circumference with daily weight gain was low.There were strong genetic and phenotypic correlations between height and chest circumference and daily weight gain,and the heritability of both was high.The birth weight,daily weight gain,weekly weight,body length and chest circumference of single fetu-ses were significantly higher than those of twin fetuses;the birth weight and daily weight gain of single fetuses were in an upward trend during the period of birth year;the birth weight,daily weight gain and weekly weight of group 1 were significantly higher than those of group 2,and the body height,length and chest circumference of group 2 were significantly higher than that of group 1;in the number of litters,the birth weight,daily weight gain and body height of litters 2,3 and 4 were significantly higher than those of litters 1 and 5;The age of ewes at 2,3 and 4 years old was significantly higher than that of 1 year old,daily weight gain and weekly weight at 1 and 2 years old were significantly higher than those of 3 and 4 years old,and there was no signifi-cant difference among other traits.[Conclusion]Soffolk sheep are tall,the heritability of body length is high,weight at birth,weight at the age of one year,chest circumference belongs to medium heritability.The heritabil-ity of daily weight gain was low.There was a negative genetic correlation between chest circumference and body height and body length.The other traits were positively correlated.The soffolk sheep herd 2017-2019 early growth traits showed an upward trend.The fecundity of 2 or 3 ewes reached the best level.
万方数据
维普
