Occurrence and Management of Bovine Mastitis Caused by <i>Mycoplasma bovis </i>at a Dairy Farm in Chiba Prefecture

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  • ISHIYAMA Dai
    Sekiyado Branch Office, Seibu Veterinary Clinic, Chiba Prefectural Federated Agricultural Mutual Aid Association (P.F.A.M.A.A.)
  • SATOH Hiroyasu
    Sekiyado Branch Office, Seibu Veterinary Clinic, Chiba Prefectural Federated Agricultural Mutual Aid Association (P.F.A.M.A.A.)
  • INOUE Nobuko
    Sekiyado Branch Office, Seibu Veterinary Clinic, Chiba Prefectural Federated Agricultural Mutual Aid Association (P.F.A.M.A.A.)
  • OGAWA Akihiro
    Chiba Office, Chuo Animal Health and Hygiene Service Center
  • MATSUMOTO Atsuko
    Sakura Office, Chuo Animal Health and Hygiene Service Center
  • SHIMIZU Hideshige
    Sekiyado Branch Office, Seibu Veterinary Clinic, Chiba Prefectural Federated Agricultural Mutual Aid Association (P.F.A.M.A.A.)

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Other Title
  • 千葉県で確認された牛マイコプラズマ性乳房炎の発生状況と清浄化対策
  • チバケン デ カクニン サレタ ギュウ マイコプラズマセイ ニュウボウエン ノ ハッセイ ジョウキョウ ト セイジョウカ タイサク

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The occurrence of bovine mycoplasmal mastitis was observed for the first time at a dairy farm in Chiba Prefecture, Japan. Successive cases of refractory mastitis, which was not cured by antibiotics, occurred between May and June of 2012. Mycoplasma bovis was identified in mastitic milk of the diseased cows. Cows with mycoplasma mastitis manifested respiratory symptoms (4/5), udder edema (4/5), and multiple infected quarters (5/5). Bacteriological analysis of milk cultured on 5% sheep blood agar plates was negative for bacterial isolation (4/4). Mycoplasma survey of all milking cows revealed a prevalence rate of 12% (6/50). Six mycoplasma-positive cows were separated from other milking cows and treated with effective antibiotic therapy, and two of them were culled. Mycoplasmas were not seen in bulk milk monitoring after December 2011. A heifer suspected of subclinical infection with M. bovis is believed to have introduced and spread the infection to other cows after delivery. Therefore, in the areas where numerous cows are introduced from other areas, it is important to regularly conduct mycoplasma investigations of bulk milk.

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