1 Lecture 19 Placentation and Maternal Recognition of Pregnancy Animal Science 434 John J. Parrish Na + [Na + ] H 2 O Zona Pellucida Zona Pellucida Trophectoderm Trophectoderm Inner Cell Mass Inner Cell Mass Blastulation Tight Junctions Tight Junctions Gap Junctions Gap Junctions Hatching Bovine » 9 - 11 days Equine, Ovine » 7 - 8 days Porcine » 6 days Conceptus Growth Spherical Spherical Filamentous Filamentous Cow • Day 15, 1-2 mm • Day 18-19, 10-20 cm Tubular Tubular Embryonic Area Embryonic Area Elongating Trophoblast Elongating Trophoblast Mare remains spherical! Mare remains spherical! Occurs in cow, pig and sheep Development of Porcine Conceptuses from Day 10 to 12 5 mm Spherical 10 mm Spherical 15 mm Tubular 150 mm Filamentous Inner Cell Mass Elongated Day 15 Porcine Conceptus Embryo
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Lecture 19Placentation and MaternalRecognition of Pregnancy
Animal Science 434John J. Parrish
Na+ [Na+]
H2O
Zona PellucidaZona Pellucida
TrophectodermTrophectoderm
Inner Cell MassInner Cell Mass
Blastulation
Tight JunctionsTight Junctions
Gap JunctionsGap Junctions
Hatching Bovine
»9 - 11 days Equine, Ovine
»7 - 8 days Porcine
»6 days
Conceptus Growth
SphericalSpherical
FilamentousFilamentous
Cow• Day 15, 1-2 mm• Day 18-19, 10-20 cm
TubularTubular
EmbryonicArea
EmbryonicArea
ElongatingTrophoblastElongating
Trophoblast
Mareremains
spherical!
Mareremains
spherical!
Occurs in cow, pig and sheep
Development of Porcine Conceptusesfrom Day 10 to 12
5 mm Spherical10 mm Spherical
15 mm Tubular
150 mmFilamentous
Inner CellMass
Elongated Day 15 PorcineConceptus
Embryo
2
Uterine Location of ElongatingRuminant Blastocyst
CorpusLuteum
Bovine andOvine
Pig Intrauterine Migration
Day 5
Pig Intrauterine Migration
Day 7
Pig Intrauterine Migration
Day 12
Embryosbecome fixed Transuterine
migration is rarein cow and ewe!
Transuterinemigration is rarein cow and ewe!
Trans-uterine Migration in the Mare
CorpusLuteum
Fixationon day15 - 16
Fixation canoccur in either
horn!
Begins Day 10Gastrulation
BlastocoeleCavity
EndodermEndoderm
Inner Cell MassInner Cell Mass TrophectodermTrophectoderm