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Related Flashcards
Cards In This Set
| Front | Back |
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Mares are what type of breeders?
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Seasonally polyestrous, long day breeders
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How long is gestation in a mare?
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320 - 345 days
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Define: Anovulatory
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Anestrus, reduced reproductive efficiency
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Average estrous cycle in a mare?
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21 days
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Length of heat?
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5-7 days
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When do mares ovulate?
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Last 48 hours of estrus
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Estrous Cycles
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Estrus
Metestrus Diestrus Proestrus |
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Define: Estrus
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Sexual receptivity and ovulation occurs
5-7 days |
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Define: Metestrus
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Sexual receptivity ends
CH forms Uterus is toned |
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Define: Diestrus
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Uterus readies itself for pregnancy
CL forms Max toned uterus |
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Define: Proestrus
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Only occurs if the mare is not pregnant. Hormones change to ovulate again
CL Lysis Uterus softens |
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What is Estradiol?
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Secreted by the maturing follicle to secrete FSH and LH
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What is Progesterone
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"Pregnancy hormone"
secreted by the CL to maintain pregnancy |
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What is GnRH?
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Gonadotropin Releasing Hormone
Secreted by the hypothalamus with elevated estradiol causing FSH and LH to be released |
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What is FSH?
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Follicle Stimulating Hormone
Secreted by the Ant Pit with elevated GnRH causing follicle growth |
