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Livestock Reproduction 333 > Implantation > Flashcards

Implantation Flashcards

1
Q

When does the oocyte become an embryo?

A

After Syngamy

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2
Q

What does the term conceptus all entail?

A

Embryo during early embryonic stage, fetus and placenta

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3
Q

Describe a cleavage that occurs in the ZP

A

Zygote undergoes mitotic diviosions

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4
Q

What is a blastomere?

A

A two celled embryo from the first cleavage division.

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5
Q

What is totipotency?

A

When the blastomere has potential to form a fully developed individual
Has not been seen past a 16 cell stage

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6
Q

What is Morula?

A

Solid ball of cells in which the cells in the center begin to compact more than the outer region

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7
Q

What is MRP?

A

Maternal Recognition of Pregnancy

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8
Q

What is MRP in the mare?

A

Presence of conceptus, endometrial PGF2a is reduced- Consceptus goes to different uterine horns 12-14 times a day to prevent PGF2a

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9
Q

List the species and their pregnancy recognition factors

A

Cow- bIFN-t
Ewe- oIFN
Sow- Estradiol
Horse- 3 Proteins and Estrogen

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10
Q

List the 4 extra embryonic membranes

A

Yolk sac
Allontois
Amnion
Chorion

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11
Q

What makes the amnion and chorion?

A

Trophoblast and primitive endoderm

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12
Q

What extra embryonic membranes is the fetus contribution providing space for attachment?

A

Chorioallantonic

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13
Q

What is the purpose of the amnion?

A

Fluid filled sac to protect the fetus

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14
Q

What does the Allontois do?

A

Collects waste from the fetus

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15
Q

What is the yolk sac made of?

A

Primative endoderm

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16
Q

What three things compose the extra embryonic membranes?

A

Primitive endoderm, trophoblast and embryo

17
Q

What is an ootid?

A

when female and male pronuclei can be observed in the oocyte

18
Q

What are tight junctions?

A

outer cells that have cell-cell adhesion and allow water to diffuse into the cell

19
Q

What are the gap junctions?

A

Cells in the inner portion which allow for intercellular communication

20
Q

Describe MPR in the cow.

A

Recognized 15-18 days from bIFN-t which blocks oxytocin receptors in the uterus, causing for less areas for sperm to bind to, and PGF2a is reduced
Proteins are made for implantation

21
Q

Describe MPR in a sheep.

A

Recognized 12-14 days from oIFN-t which blocks oxytocin receptors in the uterus, causing for less areas for sperm to bind to, and PGF2a is reduced
Proteins are made for implantation

22
Q

Describe MPR in the mare

A

12-14 days the spherical conceptus is bouncing in the uterus and releases 3 proteins and estrogen causing PGF2a to be reduced

23
Q

Describe the MPR in the sow.

A

11-12 days the embryo makes E2, which produces prolactin receptors where PGF2a is rerouted so it can’t kill the CL

Livestock Reproduction 333 (16 decks)

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