求翻译：采用PCR-RFLP方法, 对合作猪、大白猪、长白猪和杜洛克4种猪群的Nramp 1基因第14-15外显子在NLaⅢ的和AvaⅡ酶切位点多态性进行了检测分析。 结果表明,在4种猪群中均仅检测到3种基因型,其中在NLaⅢ酶切位点上，AA基因型为优势基因型,A等位基因为优势基因。而在AvaⅡ酶切位点上没有明显的优势基因型和优势基因。卡方检验结果表明, 4种猪群该位点均处于遗传平衡状态( P＞0.5) 。说明这一酶切位点在长期的选择过程中所受的选择压力较小。而且4种猪群的多态信息为低等多态或中等多态，故可在后续选育方案中实施中等强度的选择, 为抗病育种培育更多的素材。是什么意思？

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Uses the PCR-RFLP method, to the cooperation pig, becomes known the pig, the landrace and Du Locker 4 kind of pig group Nramp 1 gene 14-15th apparent child in NLaⅢAnd AvaⅡThe enzyme cut the position spot polymorphism to carry on the examination analysis. The result indicated that, only examines in 4

Using PCR-RFLP method, cooperation on pigs, large white pigs, landrace and Duroc 4 swine herds of Nramp 1 gene di14-15 Exon of NLa III restriction and Ava ⅱ polymorphism detection and analysis. Results show that, 4 3 genes are only detected in swine farm, on the NLa III restriction point, AA genotyp

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