Term
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Definition
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Term
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Definition
- Modified-->proestrus (1-3 days) and estrus (8 days)
- Average estrous cycle length is 14-21 days
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Term
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Definition
- Queen stands and accepts mounting and neck biting by male
- During mating, the queen may emit a loud, piercing cry known as a "mating cry"
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Term
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Definition
| The crop of follicles that grew up in proestrus undergo atresia and a new crop of follicles develops for the next estrous cycle |
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Term
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Definition
- Neuroendocrine reflex arc induced by cervico-vaginal stimulation causes surge of LH
- Ovulation w/in 24-28 hrs after
- Estrus is shortened to 6 days and metestrus (2 days) occurs
- Induced a diestrus or pseudopregnancy where the CL develops and produces progesterone for 30-50 days
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Term
| Diestrus or Pseudopregnancy |
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Definition
- Endometrial hypertrophy and elevated progesterone levels
- Some mammary gland development may occur
- Usually no behavorial changes
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Term
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Definition
- 2-3 litters per year possible
- Resumption of estrous cycles is variable and dependent on whether or not the female is still in the breeding season
- Some queens will breed during lactation and some only fater weaning
- Resumption of ovarian activity after parturition may not occur until after about 4-6 weeks
- In pseudopregnancy, ovarian activity will resume within a week of the drop in P4
- Do NOT rely on PGF2-alpha for luteolysis
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Term
| E2 & P4 during breeding season |
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Definition
- Elevated secretion of E2 (follicular growth, maturation, and estrual behavior)
- Because no mating occurs, ovulation does not occur, CL formation is absent and P4 is low
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Term
| E2 & P4 during pseudopregnancy and pregnancy |
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Definition
- Decreased interval of P4 secretion in pseudopregnancy(50days) compared to pregnancy (60 days)
- E2 increase is observed preceding parturition
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