Animal Husbandry and Feed Science ›› 2017, Vol. 38 ›› Issue (7): 47-47.doi: 10.12160/j.issn.1672-5190.2017.07.016
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CHEN Ya-jun1, ZHOU Yi2, ZHANG Qiang3, WEI Chen-ping2, HE Cheng3 ( 1.Animal Husbandry Technology Extension Station of Daxing District of Beijing, Beijing 102600, China; 2. Animal Epidemic Disease Prevention and Control Center of Shunyi District of Beijing, Beijing 101300, China;3.College of Veterinary Medicine, China Agricultural University, Beijing 100193, China)