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Early Embryogenesis - Coggle Diagram
Early Embryogenesis
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Species differences
In the sow, estradiol reroutes PGF2a secreted by the endometrium
In the ewe and cow the blastocyst secretes materials that block the synthesis of uterine oxytocin receptors
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The equine conceptus must make extensive contact with the endometrial surface to initiate and complete maternal recognition of pregnancy
Maternal recognition of pregnancy in the dog and cat probably does not require a signal from the conceptus
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Development of the extraembryonic membranes represents an "explosion" of embryonic tissue growth prior to attachment 
The extraembryonic membranes of the preattachment embryo consists of the: yolk sac, chorion, amnion, allantois
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