Embryonic diapause (from the Greek. dia – through and lat. pausa -stop, termination), the termination of the development of the embryo immediately after fertilization or at any stage of embryonic development. Embryonic diapause occurs in some mustelids (e.g., weasels) and ungulates (ROE deer). The biological significance of embryonic diapause in ungulates is the lengthening of the process of fetal development to align the delivery with the most favorable period of the year. The ermine embryonic diapause is related to the fact that the male covers almost newborn females within the mother nest. In this case, embryogenesis is delayed until the transition of females to independent living.
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