Efficacy of enteric‐coated tilmicosin granules in pigs artificially infected with Actinobacillus pleuropneumoniae serotype 2 oleh Zhen Dong, Xu‐Zheng Zhou, Ji‐chao Sun, Xiao‐Bin Meng, Hong‐Sheng Li, Fu‐Sheng Cheng, Xiao‐Juan Wei, Bing Li, Wei‐Wei Wang, Ji‐Yu Zhang