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20 Cards in this Set
- Front
- Back
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What do progestin's do?
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-Shorten spring transition -synchronize estrus -maintain pregnancy |
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what do prostaglandins do?
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-shorten diestrus -synchronize estrus |
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human chorionic gonadotropin (HCG)
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-LH and FSH activity -ovulation in 48 h- makes mares ovulate -follicle > 30 mm -useful for frozen semen -comes from pregnant women |
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Signs of estrus
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-fence pushing -squatting -tail raise -urination -winking |
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signs of diestrus
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-ears back -kicking -agression |
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What is the most important activity on a breeding farm?
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Heat checks
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|The reproductive tract in mares and donkeys returns to normal size after __ days?
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10
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the earlier in the year you breed horse...
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...the longer the gestation period.
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the average length of pregnancy in horses is
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340 days
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critical period of fetal growth and development for foals is
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prior to day 40.
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roughly __% of mares lose pregnancy by days __ to __
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20% days 11-15
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Reasons for infertility in the mare
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-genital conformation -diseases -anomalies of the reproductive tract -management |
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Testis needs to be _-_ degrees cooler than rest of stallion
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4-5 degrees
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how many days does it take for semen to mature in a stallion?
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60 days
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All reproductive hormones in stallions are same as in mares except one. It is...
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testoterone
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Stallions remain fertile all year. T or F?
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True
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Stallions produce __ as many sperm cells during breeding season
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twice as many
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causes of infertility in the stallion
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-diseases -increased testis -aspermic -hemospermic -psychological -overuse |
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What does estrogen do?
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It readys the reproduction tract -cervix dilates -uterus enlarges -mare becomes interested in breeding |
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what does progesterone do?
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opposite of estrogen.-cervix closes -stop being interested in stallions
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