黒毛和種子牛における周産期死亡の原因と出生時体重

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タイトル別名
  • Relationship between Perinatal Death and Birth Weight in Japanese Black Calves
  • クロゲワシュ コウシ ニ オケル シュウサンキ シボウ ノ ゲンイン ト シュ

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An etiological survey on stillbirth and neonatal death in Japanese Black cattle was carried out through 1987 to 1993. Incidences of stillbirth and neonatal death in 6,475 carvings were 2.4% and 2.1%, respectively. Twenty-one percent of the stillbirth was associated with dystocia, 5.1% with death of dams, 3.9% with congenital defects and other 69.7% with unknown reasons. The neonatal death was caused by neonatal weakness (59.4%), diarrhea (17.3%), injuries by dams (4.5%), pneumonia (3.8%), omphalitis (3.8%) and congenital defects (3.0%). Average birth weight of the fetus on stillborns was 21.0 ± 8.2 kg and one of the newborns was 21.7 ± 7.0 kg. The stillborns with unknown reasons had markedly low weight (19.2 ± 7.5 kg), as well as the newborns with weakness (19.7 ± 6.8 kg). There was a significant positive correlation between the birth weight and gestation period in stillborns (P<0.01), though no significant correlation was found in the newborns with weakness in which average gestation period was 283.7 ± 11.3 days. These findings suggest that the low birth weight termed, "small for dates", is one of the major causes of neonatal weakness and subsequent death in Japanese Black cattle.<br>

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