Click and wait for everything to happen. Canine Estrous Cycle Click and wait for everything to happen.

Canine Estrus

Normal Physiology Review

Anatomy Brain Hypothalamus Anterior pituitary Uterine horns Ovaries Cervix Vagina/ vestibule Uterine body

Follicular growth: Proestrus and Estrus Proestrus GnRH Estrogen FSH

Ovulation - Pregnancy/ Diestrus GnRH Ovulation Corpus luteum Estrogen GnRH Ovulation LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH Corpus luteum LH LH LH LH Progesterone

Proestrus Anestrus Estrus Pregnancy/Diestrus Canine Estrous Cycle 9 days Canine Estrous Cycle Anestrus 90 days Estrus 9 days Pregnancy/Diestrus 60 days

Follicular growth: Proestrus and Estrus Proestrus GnRH Estrogen FSH 1 9 2 3 5 4 6 7 8

Ovulation - Estrus GnRH Ovulation Corpora lutea Progesterone Estrogen LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH Progesterone initial rise starts with LH peak and rises during estrus (not diestrus) LH LH LH LH LH Ovulation over 24 hours LH Corpora lutea LH LH LH LH Progesterone LH Surge Proestrus Estrus 1 9 2 3 5 4 6 7 8 1 9 2 3 5 4 6 7 8

LH Surge Ovulation Metaphase II and polar body extrusion Metaphase II secondary oocyte with polar body LH LH LH LH LH LH 24 hours 24 hours LH Surge Ovulation Estrus 1 9 2 3 5 4 6 7 8 1 2 4 3 5 6

Eggs ready for fertilization Fertile period = 3-6 days post LH Reduction Division Eggs ready for fertilization Fertile period = 3-6 days post LH LH = day 0 LH Surge Ovulation Estrus 1 9 2 3 5 4 6 7 8

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