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New-born cubs of the Japanese black bear: The Japanese black bear gives birth and nurtures new-born cubs using energy from accumulated body fat during the denning period in winter, following achievement of embryonic diapause and fetal growth during the gestation period. From observation studies of the corpus luteum and corpus albicans and the placental scar in the ovary and uterus, respectively, it is suggested that bears sometimes fail in reproduction due to litter loss after birth. See the article by Atsushi Yamanaka et al. on page 31. |
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