A case of improved low milk fat syndrome associated with subacute rumen acidosis

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  • Fujikura A.
    Fukuoka Prefecture Dairy Cooperative, Fukuoka Dairy Cattle Artificial Insemination Clinic Office
  • Goto A.
    Fukuoka Prefecture Dairy Cooperative, Fukuoka Dairy Cattle Artificial Insemination Clinic Office

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  • 亜急性ルーメンアシドーシスの関与が疑われた低乳脂肪症候群多発酪農場の改善事例
  • アキュウセイ ルーメンアシドーシス ノ カンヨ ガ ウタガワレタ テイニュウシボウ ショウコウグン タハツ ラクノウジョウ ノ カイゼン ジレイ

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<p>　Low milk fat syndrome in dairy cows is characterized by marked milk fat depression. Diagnosis and treatment are difficult because it is often asymptomatic. Its causes are various and include nutritional factors such as changes in the rumen fermentation environment as well as genetic and seasonal factors. In 2016, the bulk milk fat percentage decreased to 3.2% in the summer and 3.35% in the winter at a dairy farm located in Fukuoka Prefecture. Low milk fat syndrome was diagnosed based on the farm record of increased percentage（33%）of lactating cows producing low fat milk（≤3.2% fat）in January 2017. The lactose percentage in bulk milk was unchanged in the summer but increased in the winter of 2016. After a detailed review of the farm records, subacute rumen acidosis was suspected as a possible primary cause based on the increased lactose percentage, increased ratio of concentrate feed and decreased ratio of ruminating cows as well as the large number of cows with a fecal consistency score of ≥4. After appropriate treatment and improved management, the bulk milk fat percentage increased to ≥3.6% in the summer of 2017. In addition, the milk fat percentage significantly increased from 3.29 ± 0.80%（mean ± SD） to 3.73 ± 0.56%（p < 0.05）, and the ratio of lactating cows producing low fat milk（<3.2%）significantly decreased from 33% to 16%. Thus, production records and farm monitoring seem to be a useful approach for the diagnosis and improvement of low milk fat syndrome.</p>

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