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The '''blastocyst''' ''''hatches'''' from the zona pellucida, although the period after fertilisation that this occurs is variable depending on species. '''Blastocyst''' hatching occurs in rodents, dogs, cats and primates 8 days after fertilization whilst in ungulates it is 12 days after fertilization. Once hatched, the '''blastocyst''' is free-floating within the uterus, totally dependent on the uterine environment for survival.
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The '''blastocyst''' ''hatches'' from the zona pellucida, although the period after fertilisation that this occurs is variable depending on species. '''Blastocyst''' hatching occurs in rodents, dogs, cats and primates 8 days after fertilization whilst in ungulates it is 12 days after fertilization. Once hatched, the '''blastocyst''' is free-floating within the uterus, totally dependent on the uterine environment for survival.
     
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