›› 2016, Vol. 43 ›› Issue (4): 973-979.doi: 10.16431/j.cnki.1671-7236.2016.04.018

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Study on the Yield Grade Model of Hybrid F1 of Angus×Qinchuan Cattle

LI Jing, LANG Yu-miao, ZHANG Li, SUN Bao-zhong, XIE Peng, LI Hai-peng   

  1. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2015-09-21 Online:2016-04-20 Published:2016-04-27

Abstract: The experiment was conducted to screen the carcass traits of hybrid F1 of Angus×Qinchuan cattle and establish the yield model.115 Angus×Qinchuan F1 cattles were randomly selected and the carcass traits were measured to screen and establish the yield model.Correlation analysis and multivariate factor analysis were used to decompose the correlation matrix of carcass measurement traits of crossed-bred cattles.The results showed that carcass weight, hindquarter cut, loin eye area and backfat thickness were important yield indexes.The model was set up by matching them to meat production percentage with multivariate linear regression:Meat production percentage(%)=41.372-0.046×carcass weight+0.403×hindquarter cut -0.049×loin eye area+0.334×backfat thickness (R2=0.850).The model was proved to be accurate after the regression diagnostics and t test with no significant differences between predicted values and measure values.These results indicated that the model could be used to predict the meat yield of hybrid F1 of Angus×Qinchuan cattle and provide technical support to carry out the carcass grading of snowflake cattle.

Key words: snowflake cattle; carcass traits; yield classification; classification model

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