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Choriovitelline Placetation is
Yolk Sac combines with the Chorion to form placenta --Horse and dog 1st 1/4 gestation
Allantois combines with Chorion to from placenta ruminant pig carnivore equine
Deciduate loss is
Extensive loss of maternal tissues at time of parturtiton carnivores and primates -- always paired with Labyrinthine
Non-Decdiuate loss is
Little loss of maternal tissue at time of parturition sow mare and ruminants -- always paired with
How long are ova/ sperm viable?
Sperm -Usually 1-2 days, up to 6-7 days in horse and dog, 32 days in fowl, 70 in turkey. Ova are usually viable for 24 hours.
Describe Monozygous Twinning
One oocyte is released, divides att he blastocyst stage into two gentically identical masses. Always same sex, identical twins.
What is a freemartin?
In Dizygous twinning a common circulation of the embryos, the female is born infertile b/c of the influence of testosterone produced by male embryo.
What is meroblastic cleaagve?
Partial division of the zygote, yolk prevents complete division -- birds
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