肉用 種鷄의 八週齡時 可食屠體率과 蓄積脂肪 含率의 遺傳母數에 관한 硏究 = Study on the Genetic Parameters for Weights of Eviscerated Carcass and Fat Depots as Ratio of Live Body Weight at Eight Week Old Broiler Strain

다국어 초록 (Multilingual Abstract)

This experiment was conducted to estimate the genetic parameters of evisceated carcass, abdominal fat pad, carcass fat and total body fat weight percentages at 8 week old W.P. Rock C Line, maintained by the Live-Stock Experiment Station, R. D. A. Surweon. Records of 375 progeny produced by 13 sires and 46 dams were analyzed, and the results obtained were summarized as follows:
1. Respective valuses of examined traits were live weight 1473.7g. and 1850.3g, eviscertated carcass weight 60.2% and 61.6%, abodominal fat pad weight 3.1% and 2.7%, carcass fat weight 11.7% and 11.3%, and total body fat weight 14.5% and 13.7% for female and male chicks, respectively.
2. There were no significant differences between dam and sire variance components for examined traits. Therefore, the heritability estimates based on the sire variance component for examined traits were similar to those based on the dam variance component. The heritabilily estimates based on both sire and dam components (???) for weights of body parts as ratios of live weight were eviscerated carcass 0.389 and 0.341, abdominal fat pad 0.253 and 0.261, carcass fat 0.172 and 0.217, and total body fat 0.190 and 0.210 for male and female, respectively.
3. Estimates of phenotypic correlations of live weight(g) and eviscerated carass(%) with measures of abdominal fat pad(%) carcass fat(%) and total body fat(%) were comparatively low. However, relationships between live weight(g) and eviscerated carcass(%), abdominal fat pad(%) and carcass fat(%) or total body fat(%) were moderate in magnitude. Corresponding correlation between total body fat(%) and carcass fat(%) tend to be very high and positive.
4, Genetic correlations(??) between measures of examined traits were generally high. Respective values for abdominal fat pad(%), carcass fat(%) and total body fat (%) were -0.766 and -0.672, -0.606 and -0.703, and -0.571 and -0.712 with live weight(g) in male and female, respectively: they were -0.542 and -0.676, 649 and -0.324, and -0.447 and -0.378 with eviscerated carcass percentages. Estimates of genetic correlations of eviscerated carcass percentages with live weight(g) were 0.935 and 0.840 for male and female, respectively. Genetical relationships between total body fat percentages and abdominal fat pad(%) or carcass fat(%) tent to be very high and positive(0.804∼0.978). And corresponding correlations between abdominal fat pad and carcass fat percentages for male and female were 0.854 and 0.913 respectively.