乳牛の心筋壊死病変を伴う低カルシウム血症の臨床所見

岩手大学農学部（〒020-8550　盛岡市上田3-18-8）

（1998年5月25日受付・1999年4月2日受理）

分娩後に横臥・死亡し病理組織学的に心筋壊死病変がみられた低Ca血症乳牛5例（心筋病変群）と，分娩後に低Ca血症を呈しCa剤治療により起立した6例（乳熱群）の臨床所見を比較した．心筋病変群の臨床症状は乳熱群に比較して重篤で，食欲廃絶，横臥，呻吟・苦悶，開口呼吸と泡沫性流涎を特徴とした呼吸困難症状，高度頻脈ならびに呼吸速拍が認められ，多くの例ではこれらの症状がCa剤治療後も認められた．心筋病変群の初診時血漿Ca濃度は乳熱群同様低値を示し，両群ともCa剤治療後ほぼ正常範囲内に復した． ―キーワード：乳牛，低カルシウム血症，乳熱，心筋壊死病変，分娩． --------------------日獣会誌　52，493〜497（1999） Clinical Characteristics of Hypocalcemia in Cows with Myocardial Necrosis Norio YAMAGISHI, Jun SATO, Reeko SATO and Yoshihisa NAITO Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka 020-8550, Japan SUMMARY 　Clinical signs of 5 post-parturient hypocalcemic cows dead or slaughtered with myocardial necrosis (MN cases) were compared with those of 6 cows with milk fever showing recumbency and standing after Ca ther-apy (MF cases). The clinical signs of the MN cases were anorexia, lateral recumbency, dyspnea characterized by oral breathing and foamy drooling, severe tachycardia and hyperpnea, seemingly being severer as compared with those of the MF cases, and mostly persisting even after Ca therapy. The MN cases had hypocalcaemia as high as that of the MF cases, at the first examination, and the plasma Ca levels turned to normal after Ca therapy in both cases.　 ―Key words : cow, hypocalcemia, milk fever, myocardial necrosis, parturition. --------------------J. Jpn. Vet. Med. Assoc., 52, 493〜497 (1999)