Anestrus
Anestrus is a stage of sexual quiescence characterized by the lack of estrus behavior. Anestrus is a normal stage of reproductive function in the prepubertal and in aged animals of all specious. Pregnancy is the most common cause of anestrus in polyestrous specious. After puberty, anestrus is seen-
- In non pregnant animals in Monoestrus species such as bitch
- In seasonally polyestrous species during non breeding season
- During the lactation in females
In all domestic species, anestrus may occur as a pathological condition caused by a variety of factors, including nutritional deficiencies, environmental influences. That cause endocrine imbalance diseases of ovaries and uterus and infectious diseases causing early embryonic death or abortion.
All these factors result in economic losses, due to reproduce failure.
Anestrum is characterized by the quiescent, function less ovaries and reproductive tract.
Uterus is small and flaccid. The vaginal mucosa is pale vaginal mucus is scanty and sticky and cervix and tightly closed.
Some follicular activity of the ovaries may develop but a mature follicle and ovulation seldom occur during the anestrus period.