Bovine Bovine Equine, Ovine Porcine
Ectoderm Ectoderm - CNS
- Sense organs
- Mammary glands
- Sweat glands
- Skin
- Hair
- hooves
Yolk Sack Yolk Sack Amnion - Non-vascular, fluid filled
- Fluid produced by fetus
- Protective cushion
- Ruptures at birth (not breaking of water)
Allantois Allantois - Blood vessels
- Fuses with chorion
Chorion - Outermost membrane
- Attachment to mother
CL does not regress if not pregnant Psuedopregnancy
Superficial Superficial - Chorion lies opposed to uterine wall
- Farm animals
Eccentric - Chorionic sack in a uterine fold
- Rodent
Interstitial
Deciduate Deciduate - Eccentric, interstitial
- Rodent, human
Indeciduate or Nondeciduate
Cotelydonary - cow, sheep Cotelydonary - cow, sheep Diffuse - pig, horse Zonary - dog, cat Discoid - human
20% of fetal placenta Invade endometrium Source
Unique to ruminants Unique to ruminants Has been used to detect pregnancy - Cattle, sheep, deer
- Can be used to detect pregnancy in cows after day 25
From both trophoblast and endometrium 5 to 10 Form between days 35 to 60 Produce equine chorionic gonadotropin (eCG, PMSG) Sloughed off after day 60
Fetal and maternal blood does not mix during gestation. Fetal and maternal blood does not mix during gestation. Mixing may occur at parturition and may result in antibodies against specific fetal blood type. Impacts future fetuses or neonates!!! - Erythoroblastosis Fetalis – Human
- Antibodies cross placenta (Rh factor)
- Neonatal Isoerythrolysis – Cat and Horse
- Antibodies in colostrum and absorbed first 24 hr of neonate’s life
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