【摘要】 以零世代和一世代高、低脂系肉鸡为素材 ,个体记录高、低脂系母鸡产蛋性能 ,屠宰测定零世代 54周龄母鸡腹脂重 (率 ) ,探讨肥度性状与产蛋性能的关系 ,并研究零世代、一世代高、低脂系产蛋性能选择效应。结果表明 :在限饲条件下 ,腹脂重 (率 )与开产日龄、产蛋量表型相关很弱。腹脂重 (率 )与蛋重呈负表型相关趋势 ;零世代高、低脂系产蛋性能差异不显著。一世代低脂系比高脂系早开产 6.7d,低脂系 4 0周龄和 54周龄产蛋量显著高于高脂系 ,表明对血浆 VLDL浓度的选择使产蛋性能产生了有益的间接反应更多还原

【Abstract】 Broiler breeders in G 0 and G 1 generation were studied. Fat and lean lines were established by selecting plasma VLDL concentration. Egg performance of broiler breeders were recorded individually. Abdominal fat weight (AF) and Abdominal fat percentage (AFP) of 54 week old female chickens were measured in G 0 generation, and relationship between fatness and laying performance was investigated. Selective effects of egg performance were compared between high and low fat line in G 0 and G 1 generation. The results showed: Phenotypic correlation between AF weight or AFP and the day old of 50% egg production, or egg production were negligible under food restriction condition, and negative phenotypic correlation trend between AF or AFP and egg weight was observed. No difference of egg performance between fat line and lean line was observed in G 0 generation. In G 2 generation, day old of 50% egg production was 6.7 days less in lean than fat line, egg production of 40 weeks and 54 weeks was significantly higher in lean line than fat line, which indicated that plasma VLDL concentration selected could make better indirect response for laying performance.更多还原