This study tested and compared different implementation strategies for genomic selection for Norwegian White Sheep, aiming to increase genetic gain for maternal traits. These strategies were evaluated for their genetic gain ingrowth, carcass and maternal traits, total genetic gain, a weighted sum of the gain in each trait and rates of inbreeding through a full-scale stochastic simulation. Results showed genomic selection schemes to increase genetic gain for maternal traits but reduced genetic gain for other traits. This could also be obtained by selecting rams for artificial selection at a higher age. Implementation of genomic selection in the current breeding structure increased genetic gain for maternal traits up to 57%, outcompeted by reducing the generation interval for artificial insemination rams from current 3 to 2 years. Then, total genetic gain for maternal traits increased by 65%-77% and total genetic gain by18%-20%, but at increased rates of inbreeding.

中文翻译：

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改善挪威白羊母性性状的基因组选择策略

本研究测试并比较了挪威白羊基因组选择的不同实施策略，旨在增加母性性状的遗传增益。通过全面随机模拟评估这些策略的遗传增益向内生长、胴体和母体性状、总遗传增益、每个性状增益的加权总和以及近亲繁殖率。结果显示基因组选择方案增加了母体性状的遗传增益，但降低了其他性状的遗传增益。这也可以通过选择更高年龄的公羊进行人工选择来获得。在当前育种结构中实施基因组选择将母体性状的遗传增益提高了 57%，通过将人工授精公羊的世代间隔从目前的 3 年减少到 2 年而胜出。然后，