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Veterinary Medicine.
Topic: Physiology of Bovine Reproduction.
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Summary Reproductive Physiology of the Cow.
- GnRh: GONADOTROPINE LIBERATING HORMONE
1. Stimulates the production and release of FSH and LH, by the anterior pituitary gland (anterior lobe of the pituitary gland).
-FSH:
1. It stimulates the growth and maturation of the follicles that are found in the ovary.
-LH:
1. It contributes to the last phase of maturation of the follicle (which has become dominant) and to trigger its ovulation.
2. It contributes so that the clot formed after ovulation, becomes Corpus Luteum (Yellow Body)
- ESTRADIOL:
1. Contributes to expressing sexual behavior (behavior characteristic of heat or heat) in the female, by acting on the central nervous system.
2. It also stimulates GnRH, so that LH is specifically released.
3. It generates changes in the uterus, which favor the transport of sperm.
INHIBIT
1. Inhibits the release of FSH without altering the release of LH
PROGESTERONE:
1. It inhibits the release of GnRh, which will also decrease the levels of FSH and LH. This prevents new ovulations.
2. Prepares the uterus to receive an embryo, generating changes in its mucosa, which allows it to be nourished during the first days of pregnancy.
PGF2a
1. Causes regression or destruction of the corpus luteum (promotes luteolysis)
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TO CONSIDER
The day in which the release of endometrial PGF-2alpha is given to lyse the corpus luteum, varies according to the literature:
According to E.S.E. HAFEZ: On day 16 or 17
According to Cunningham: On the 14th
According to García Sacristán: It begins at day 14 after ovulation and produces a decrease to day 18
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PRACTICAL APPLICATIONS
Low concentrations of Estrogens together with high concentrations of Progesterone, constitute a strong stimulus inhibiting the secretion of Gonadotropins.
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BIBLIOGRAPHY
- García Sacristán. Veterinary Physiology.
- Veterinary Physiology. Cunningham.
- THAT. Hafez.Reproduction and artificial insemination in animals.