Beef estrus symptoms

Estrus is a manifestation of cow sexual activity due to gonad endocrine stimulants and morphological changes in reproductive organs. Under the action of pituitary gonadotropins, when the concentration of estradiol secreted by the follicles on the cow's ovary develops and matures in the blood, the changes in the reproductive physiology of the cow are caused by a series of changes. Impulsive, willing to approach the bull and accept the mating.

Cows are estrus animals during the four seasons, but cattle are more estrus in May-July. Estrus cows undergo a series of sexual activity changes in physiology and behavior. The complete estrus should have the following changes:

(1) Accepting other cows to climb over estrus Cows crawl across other cows or other cows during a game or grazing, and other cows climb during estrus, staying still.

(2) Changes in behavior Estrus Cows have bloodshot eyes and sharp eyes. They often show excitement, anxiety, sometimes screaming, loss of appetite, increased frequency of defecation and urination.

(3) changes in the reproductive tract due to the role of estrogen, estrus cow genital congestion, swelling, cervical relaxation, congestion, neck opening, gland secretion increased, vulva outflow of transparent mucus. Tubal epithelial cells grow, lumens expand, secretions increase, tubal umbrellas are open and wrapped in the ovaries.

(4) Changes in the ovaries Ovarian follicles develop rapidly in the ovary 2 to 3 days before, follicular fluid increases, follicle volume increases gradually, follicular wall thinns, protrudes from the surface of the ovary, and finally matures and ovulates, and gradually forms after ovulation. Yellow body.

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