COW REPRODUCTIVE HORMONES

REPRODUCTIVE HORMONES of cow

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To understand the physiological bases of the bovine reproductive system, the generalities of the main reproductive hormones of the female bovine and their interaction are presented here.

 

 

 

GONADOTROPINE LIBERATING HORMONE (GnRh)

  • Stimulates the production and release of FSH and LH by the adenohypophysis (anterior pituitary).

 

FSH

  • Stimulates the growth and maturation of the ovarian follicle.

 

LH

  • It contributes to the last stage of maturation of the follicle (which has become dominant) to trigger its ovulation.
  • It helps so that the clot formed after ovulation becomes a corpus luteum.
  • It generates changes in the uterus that favor the transport of sperm.

 

ESTRADIOL

  • It helps to express sexual behavior of female (heat), acting on the central nervous system.
  • It also stimulates the release of GnRH.

 

INHIBINE

  • It inhibits the release of FSH without altering the release of LH.

 

PROGESTERONE

  • It inhibits the release of GnRh, which will also reduce the levels of FSH and LH. This avoids new ovulations.
  • Prepares the uterus to receive an embryo, generating changes in its mucosa so that it can be nourished during the first days of pregnancy.

 

Prostaglandin F2alpha  (PGF2α)
  • It produces the regression or destruction of the corpus luteum (favors luteolysis).

 

 

Factors to be considered

 

  • The day on which the release of endometrial PGF-2alpha is given to lyse the luteal body, varies according to the literature:

-On day 16 or 17 (According to E.S.E. HAFEZ).

-On day 14 (According to Cunningham).

-It begins on day 14 after ovulation and produces a decrease on day 18 (According to García Sacristán)

  • Low estrogen concentrations together with high concentrations of progesterone, constitute a strong inhibitor of Gonadotropins secretion.

 

 


 

BIBLIOGRAPHY

 

– Cunningham’s Textbook of Veterinary Physiology.

– E.S.E. Hafez. Animal reproduction and artificial insemination.

– García Sacristán. Fisiología veterinaria.

 


 

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