Estimate of genetic parameters for egg yolk cholesterol content
1989
Hong, K.C. | Park, E.W. (Korea Univ., Seoul (Korea R.). Coll. of Agriculture) | Chung, S.B. (Rural Development Administration, Suwon (Korea R.). Livestock Experiment Station)
This study was conducted to estimate genetic parameters for egg yolk cholesterol. Content of egg yolk cholestrol was measured for a total of 473 hens of White Leghorn line. Cholesterol values were obtained from three consecutively laid eggs when hens were 53 weeks of age. The yolk of each egg was weighted and freeze dried. Dried egg yolks were stored at -20deg C until analyzed. Yolk cholesterol content was measured in average 56.00 +- 0.194 mg/g dry yolk. Heritability from the sire component of variance was 0.522 +- 0.215 and from the sire + dam component of variance 0.33 +- 0.209. Estimates of phenotypic correlation between yolk cholesterol and other factors such as body weight at 20 weeks of age, age at first egg, 40-week total egg number, egg production rate; 53-week egg weight and 53-week yolk weight were -0.0208, -0.0321, -0.0378, -0.0834, 0.0790 and 0.1624, respectively. And genetic correlation coefficients for each item in the order were -0.5293, 0.7105, -0.4062, -0.0254, 0.2164 and 0.5027, respectively. These results suggest the possibility that egg yolk cholesterol should be reduced through selecting of sire families. To breed for low egg yolk cholesterol, it makes age at first egg earlier and enhances total egg number so that we can obtain the high rate of egg production
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