Repro Quiz 4

Question 1

Oogenesis

Answer 1

Formation and maturation of female gamete
- Begins in prenatal period

Question 2

Oogonium

Answer 2

Potential gamete in a 1 follicle

Question 3

First step of oogenesis

Answer 3

-Growth of follicle
-Enlargement of cytoplasm
-Zona pellucida
-Proliferation of follicular cells
-Occurs after puberty

Question 4

Second step of oogenesis

Answer 4

-Meiosis
- Second oocyte retains all cytoplasm and 1/2 of nuclear material (graffian follicle)
- Completed just before ovulation in cow, sow, ewe, and mare

Question 5

Third step of oogenesis

Answer 5

-Immediately after meiosis 1
-Not completed unless fertilization takes place
- During fertilization
-Meiosis 2 (2 oocyte + sperm cell to zygote + 2nd polar body

Question 6

Times of ovulation

Answer 6

Cow- 10 to 12 hrs after end of estrus
Ewe- 24 to 30 hrs after onset of estrus
Sow- 35 to 45 hrs after onset of estrus
Mare- 1 to 2 days before estrus ends

Question 7

When does ovulation occur?

Answer 7

24 to 45 hours after LH surge peak except in mare

Question 8

Process of ovulation

Answer 8

-LH stimulation
-Enzymes in follicular wall
- Cytoplasmic and nuclear maturation of oocyte
- PGF2a and PGE2 involved in follicular rupture
-Enzymes cause follicular wall to weaken and thin
-Follicle ruptures, follicular fluid escapes w/ ovum

Question 9

Site of ovulation

Answer 9

Cow, sow, ewe - any point on ovary except hilus
Mare - ovulation fossa
-Occurs at random between ovaries

Question 10

Oocyte must pass through

Answer 10

Granulosa cells
Basement membrane
Theca interna
Theca externa
Tunica albuginea ovarii
Surface epithelium

Question 11

What do theca and granulosa cells become after ovulation

Answer 11

Luteal cells, cause by LH

Question 12

Formation of CL

Answer 12

-Corpus hemorrhagicum
-Corpus luteum
- Corpus albicans (no pregnancy)
- CL of pregnancy (produce more progesterone)