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Chapter 5: The Estrus Cycle

Horizontales
5-7 months old at puberty
15-36 months old at puberty (Tristan should know this one)
Animals that breed when the environment will allow for the best survival of the young at their birth.
Begins with the regression of the corpus luteum and drop in progesterone and extends to the start of estrus.
In females is defined as the age at the first expressed estrus with ovulation.
Long-day of spring breeders
Verticales
Characterized as the period in the cycle when the corpus luteum is fully functional.
Begins with the cessation of estrus and lasts about 3 days.
10-15 months old at puberty
7-10 months old at puberty
What has a dominant role in regulating the estrus cycle.
15-24 months old at puberty
The period of time when the female is receptive to the male and will stand for mating.
Short-day or fall breeders