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Estrus web
- 4. Brain
Anatomy
Hypothalamus
Anterior
pituitary
Uterine horns
Ovaries
Cervix
Vagina/
Uterine vestibule
body
- 5. Estrogen Follicular
Proestrus FSH growth:
GnRH
Proestrus
FSH and Estrus
- 6. Ovulation -
Estrogen
Pregnancy/
GnRH LH
LH
Ovulation Diestrus
LH
LH
LH LH LH
LH LH LH LH
LH LH LH
LH
LH LH LH
LH
LH
LH
LHLH
LH
Corpus luteum
LH
LH
LH LH
Progesterone
- 7. Proestrus
9 days
Anestrus Estrus
90 days 9 days
Pregnancy/Diestrus
60 days
- 8. Estrogen Follicular
Proestrus FSH growth:
GnRH
Proestrus
FSH and Estrus
Proestrus
1 2 3 4 5 6 7 8 9
- 9. Estrogen Ovulation -
GnRH Ovulation
Estrus
Ovulation over 24 hours
LH
LH
LH
LH
LH LH LH
LH LH LH LH
LH LH LH
LH
LH LH LH
LH
LHLH
LH
LH
Progesterone initial
LH
rise starts with LH
Corpora lutea
LH
LH
LH LH
peak and rises during
LH Surge
estrus (not diestrus)
Progesterone
Proestrus Estrus
1 2 3 4 5 6 7 8 91 2 3 4 5 6 7 8 9
- 10. LH Metaphase
Metaphase II
LHLH
LH II and polar
secondary
LH
LH LH
body
oocyte with
extrusion
24 polar body
hours
Ovulation
LH Surge
24
hours
Estrus
1 2 3 4 5 6 7 8 9
0 1 2 3 4 5 6
- 11. Reduction Division
Ovulation
LH Surge
Eggs ready for fertilization
Fertile period = 3-6 days post LH
LH = day 0
Estrus
1 2 3 4 5 6 7 8 9