虚弱子牛に認められた腎臓形成異常

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タイトル別名
  • Renal Malformation in the Calves with Weak Calf Syndrome
  • キョジャク コウシ ニ ミトメラレタ ジンゾウ ケイセイ イジョウ

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Three newborn Japanese Black cattle which presented weak calf syndrome from June to August 2002 in breeding farms within the jurisdiction were examined for clinical symptoms, blood chemistry, ultrasound tomography, histopathology and family history (Case 1: 13-day-old male with 12kg bodyweight, Case 2: 51-day-old male; 30 kg, Case 3: 2-day-old male; 10 kg). Clinical symptoms included loss of vigor, inability to nurse, poor growth and rough haircoat in all calves. Blood chemistry showed elevated creatinine in all three and elevated BUN in Cases 1 and2. Ultrasound tomographic examinations revealed that in Case 1 the left kidney was underdeveloped and unlobed, and the right kidney was not found. In Cases 2 and 3, both kidneys were small and unlobed. Gross examination at the autopsy also showed unlobed kidneys with discolored surfaces. Histopathologically, underdeveloped small nephrons and primitive collecting tubules were found in all cases, while there was no sign of scarring or inflammation. Their family trees were all tracked back to a Shigekane breeding bull A. This indicated that abnormal kidneys in these cases were hereditary, although kidney malformation may be caused by various factors. Further, our study suggested that ultrasonography may help diagnosis of kidney malformation when abnormalities in the renal function are indicated by blood chemistry.

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