要 約
同一牛舎内で飼育されていた6頭の黒毛和種の子牛が数日間のうちに斜頸,運動失調,虚脱などの神経症状を呈し,急性経過で死亡した.そのうちの1頭が本教室に搬入された.肉眼的に大脳浮腫,迅速病理検査により大脳皮質層状壊死が認められ,急性鉛中毒症が疑われた.本結果から死亡牛3頭の血液中鉛分析を実施したところ,正常牛よりも高濃度の鉛が検出された.鉛の摂取源として可能性の高いトタンを取り除くことにより,本症の発生はなくなった.
―キーワード:牛,大脳皮質層状壊死,鉛中毒.
--------------------日獣会誌 55,17〜19(2002)
Acute Lead Poisoning in Japanese Black Calves
Makiko TAKAHASHI*, Noritaka MAEDA, Takehito MORITA†,
Akinori SHIMADA, Yoshiyuki MARUO,
Susumu NOMA and Kohji KAWAMURA
*Department of Veterinary Pathology, Tottori University,
4-101 Koyamacho-Minami, Tottori 680-8553, Japan
SUMMARY
Six young Japanese black calves died within a few days demonstrating neurological signs
such as tilted heads, ataxia, and collapse. Necropsy revealed cerebral edema, and rapid histological
examination of one dead calf revealed cerebrocortical laminar necrosis, a characteristic sign of lead
poisoning. Lead analysis of three calves revealed a higher concentration of lead in the blood than was
found in unaffected calves. The source was discovered to be a piece of galvanized iron painted with paint
containing lead. Its removal prevented additional occurrences of the illness.
―Key words : calf, cerebrocortical laminar necrosis, lead poisoning.
† Correspondence to : |
Takehito MORITA (Department of Veterinary Pathology, Tottori University) 4-101 Koyamacho-Minami,
Tottori 680-8553, Japan
TEL・FAX 0857-31-5424
|
-------------------- J. Jpn. Vet. Med. Assoc., 55, 17〜19 (2002) |