• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Conference of the New Zealand Society of Animal Production >Correlated responses following genetic selection to change faecal worm egg count in Romney sheep
【24h】

Correlated responses following genetic selection to change faecal worm egg count in Romney sheep

机译：在遗传选择后改变罗姆尼羊的粪便蠕虫鸡蛋计数的相关响应

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Genetic studies of nematode parasite-related traits were carried out in New Zealand Romney sheep between 1979 and 2006. Breeding lines were selected for high or low faecal worm egg count (FEC), and managed alongside a control unselected line. FEC datawere collected from lambs post-weaning, whilst exposed to continuous, natural, mixed-species, nematode parasite challenge under grazing conditions. Overall there were 33,314 records of lamb FEC, taken at 'FECI' and 'FEC2' (first and second post-weaningsampling times, separated by a drench treatment). Genetic parameter estimates are reviewed, including correlations of FEC with lamb, anti-parasite antibody and ewe performance traits. The heritability of FEC in lambs was 0.26 ± 0.01 overall, with a repeatability of 0.40 ±0.01. The genetic correlation between FECI and FEC2 was 0.85 ± 0.02. Trends were for low FEC to be associated genetically with slight reductions in post-weaning growth, and in ewe and lamb fleece weights, minimal change in autumn andyearling live weights, and increased weaning weight, dag score and anti-parasite antibody levels. In practice, ram breeders would normally use index selection procedures, to achieve higher production at the same time as a lower FEC, although a slower rate of change in FEC would be expected.
机译：Nematode寄生虫相关性状的遗传研究在1979年至2006年之间进行了新西兰罗姆尼绵羊进行了。选择育种线为高或低粪蠕虫鸡蛋计数（FEC），并与控制未选择的线条一起进行管理。 FEC DataWere从羊羔后部收集，虽然暴露于连续，自然，混合物种，在放牧条件下发生新线虫寄生虫挑战。总体而言，羊肉FEC有33,314条，拍摄于“FECI”和“FEC2”（第一和第二个后纺出采样时间，被浸泡处理分开）。综述遗传参数估计，包括FEC与羊肉，抗寄生虫抗体和eWE性能性状的相关性。总体上FEC的遗传性为0.26±0.01，可重复性为0.40±0.01。 FECI和FEC2之间的遗传相关性为0.85±0.02。趋势是低FEC，以促进后果后的略微减少，并且在母羊和羊羔羊毛重量中，秋季和羊羔活重的最小变化，以及随后的断奶，DAG得分和抗寄生虫抗体水平。在实践中，RAM育种者通常会使用指标选择程序，以实现更高的生产，虽然预期FEC的变化速度较慢。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号