History PCV2-associated PMWS was first identified in Canadian high health herds in 1991 (Harding, 1996; Harding and Clark, 1997). Affected herds were free of major enteric and respiratory pathogens including Mycoplasma hyopneumoniae, Actinobacillus pleuropneumoniae (APP), s ...
博文
视频
基金
相册
收藏
积分
会议