种鸡
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北京蛋鸡种源供给占全国一半以上
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杨宁教授推广蛋鸡立体养殖模式 要拿出攻破“卡脖子”技术的干劲，明确方向和目标，加快实施农业生物育种重大科技项目，早日实现重要农产品的种源自主可控。——习近平 去年底，农业农村部发布…
