摘要:
以血浆极低密度脂蛋白(VLDL)为间接选择指标，对蛋鸡血浆VLDL浓度进行双向选择.经过两个世代的选择，在测定第一和第二世代母鸡血浆VLDL浓度及各相关性状值的基础上，估计了部分性状间的相关系数.结果为：血浆高VLDL浓度组母鸡的腹脂重、腹脂含量、蛋黄重、蛋黄比例、全蛋胆固醇总量和全蛋胆固醇含量等虽略高于血浆低VLDL浓度组，但不同处理之间的差异未达到显著水平（p0.05）.而血浆低VLDL浓度组母鸡的体重、蛋白重和蛋重则相应提高，其中蛋黄比例的差异在第一、第二世代分别达到显著（p0.05）和极显著水平（p0.01）.血浆VLDL浓度与蛋重、蛋白重呈负遗传相关，而与体重、腹脂重、蛋黄重、蛋黄比例、全蛋胆固醇总量和全蛋胆固醇含量呈正遗传相关.实验结果表明，血浆VLDL浓度作为间接性状对全蛋胆固醇含量进行选择，来培育生产低胆固醇蛋的蛋鸡品系具有可行性.
Abstract:
The brown shell egg-type chickens had been used in this study to determine its plasma very low-density lipoprotein (VLDL) concentration. After two generation divergent selection for plasma VLDL concentration, plasma high and low VLDL concentration groups had been established. The influences of divergent selection for plasma VLDL concentration on some correlated traits had been found. In plasma low VLDL concentration group, body weight, egg weight, albumin weight were slightly higher than that of the plasma high VLDL concentration group, while abdominal fat weight, yolk weight, ratio of yolk to egg weight, egg cholesterol content, egg cholesterol weight were lower than that of the plasma high VLDL concentration group(p0.05). Only the difference of yolk and egg weight ratio was very significant (p0.01) according to experimental results. The correlation coefficient between plasma VLDL concentration and these traits had been estimated, the estimated correlation coefficient between plasma VLDL concentration and egg weight, albumin weight were negative, however the positive estimated correlation coefficient between plasma VLDL concentration and body weight, abdominal fat weight, yolk weight, ratio of yolk to egg weight, egg cholesterol content, and egg cholesterol weight had been found, indicating that the selection for low egg cholesterol group using plasma VLDL concentration as an indirect selection index was practicable, and further selection and research are necessary.
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