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11 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are the hormonal interactions between the various systems in the female |
The higher brain (pineal gland) Then hypothalamus, an area at the base of the brain The pituitary gland And lastly the ovaries, uterus and the testes |
Describing picture of system |
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Describe the endocrine control of the female |
The hypothalamus control the drive of the system. It produced GnRH (gonadotropin releasing hormone) which passes to the anterior pituitary though blood vessels via the pituitary stalk. FSH and LH are produced in the pituitary and is regulated by GnRH; which when secreted control ovarian activity. |
Describe flow diagram |
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What does FSH do with late production LH involved? |
FSH regulates early stages of follicle growth and development with an increasing role of LH pulses for final maturation before ovulation. |
Early stage growth and final maturation |
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Ovulation |
Ovulation is controlled by a surge of LH at oestrus |
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What effect LH production? |
LH secretion is regulated by a feedback mechanism from progesterone and oestrogen, these act on the hypothalamus and the pituitary gland. |
It's regulated by feedback mechanism from ... And ... |
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When does production of LH occur? |
With low levels of progesterone and high levels of oestrogen, this produces high levels of LH, just before oestrous |
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What is a PRID/CIDR |
PRID - progesterone release intravaginal device CIDR - controlled internal drug release A Silicon device coated in progesterone that is inpregnated into the cows vagina allowing continuous release of progesterone blocking ovulation |
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What is a PRID/CIDR |
PRID - progesterone release intravaginal device CIDR - controlled internal drug release A Silicon device coated in progesterone that is inpregnated into the cows vagina allowing continuous release of progesterone blocking ovulation |
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Reason for using a PRID or CIDR |
To tighten up calving patterns or help an animal start cycling - Once the CIDR is removed progesterone levels drop and the animal will come on heat. It can be used can be used to get a cow back in calve faster by inserting the device 60 days after calving calving or 10 months before the desired calving date in heifers |
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Synchronising in sheep (Sponge) |
For sheep you use a sponge. Essentially the same as a CIDR. This is placed into the ewes vagina for 12 days before removal. Once removed PMSG (pregnant mare serum gonadotropin) is given to the animal to aid ovulation, the ram can then be put in with the ewe at 48hrs after removal or AI can be done 54-57hrs |
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PMSG usage |
-Essential for induction of early breeding -Essential to give more precise ovulation time for AI -Not required within breeding season when using natural mating -PMSG has both LH and FSH to stimulate ovarian activity |
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