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Chapter 5 Estrus Cycle

Across
Absence of Cycling
Involves one follicle or many follicles
Has a dominant role in regulating the estrous cycle.
Begins with the regression of the corpus luteum and drop in progesterone and extends to the start of estrus
Breeding season that is initiated at a time when the environment will allow for the best survival of the young at birth.
The seasonal breeding pattern is not as well defined.
Down
Long-day Breeders
Cycle defined as the time between periods of estrus
At puberty this is affected by both genetic and environmental factors
Short-day or fall breeders.
Following a corpus luteum will form at each ovulation site.
Is established better than seasonal breeding activity.
Characterized as the period in the cycle when the corpus luteum is fully functional.
Begins with the cessation of estrus and lasts for about 3 days.
IN FEMALES ITS THE AGE AT THE FIRST EXPRESSED ESTRUS WITH OVULATION
Period of time in which the female is receptive to the male and will stand for mating