结果证明，哈白猪和长白猪的五个繁殖性状累加效应值较好，并在杂交中产生了较强的非加性效应。最优秀杂交组合是哈长组、长黑组和长哈组。
The additive effects of the above mentioned five reproductive traits was in favor of the Harbin White and Landrace, as well as the non-additive effects in cross combinations.
防护措施必须使感染效率下降85 %以上，才能使医院内传播的基本繁殖率降至临界值以下。
It is necessary to drop the infection efficiency by over 85% through protection measures for reducing the basic reproduction rate below the critical level.
结论估计公牛繁殖性能的育种值时，应事先或模型中加以剔除这些固定效应。
Conclusion When estimating the breeding values of bull's fertility, these fixed effects should be rejected beforehand or in the model.
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