Estrus cycle in dogs cytology. adj. It is characterised by a period of intense sexual receptivity, during which the female is willing to accept the male for mating. , ready to accept a male and to mate. Psuedo-pregnancy occurs in non-pregnant bitch because of increases in prolactin. This phase is characterized by a complex interplay of physiological and behavioral changes that signal readiness for copulation. Menstrual Cycle in Human Females (Figure 6) (Concept Tutor on Menstrual Cycles) Jun 14, 2025 · The estrous cycle is divided into four stages: proestrus, estrus, metestrus, and diestrus. After mating, LH surge induced, progesterone increases then decreases, estrus returns after parturition when progesterone goes back down. Dec 5, 2025 · The estrous cycle is typically divided into four main stages: proestrus, estrus, metestrus, and diestrus. . e. the recurrent, restricted period of sexual receptivity in female mammals other than human females, marked by intense sexual urge. , adj es´trual, es´trous. Estrus, commonly known as the 'heat' period, is a distinct phase in the estrous cycle of most female non-primate mammals. Estrus or oestrus refers to the phase when the female is sexually receptive (" in heat " in American English, or " on heat " in British English). Estrus, the period in the sexual cycle of female mammals, except the higher primates, during which they are in heat—i. See also estrous cycle. The estrus cycle is defined as the phenomenon of cyclic ovarian function in mammals, regulated by the interplay of the hypothalamus, anterior pituitary, and ovaries, leading to follicular maturation, steroid hormone production, and ovulation. The meaning of ESTRUS is a regularly recurrent state of sexual receptivity during which the female of most mammals will accept the male and is capable of conceiving : heat; also : a single occurrence of this state. Estrus or oestrus refers to the phase when the female is sexually receptive (" in heat " in American English, or " on heat " in British English). One or more periods of estrus may occur during the breeding season of a species. Called also estruation, estrum, and heat. Estrus, derived from the Greek word "oistros," refers to a period in the reproductive cycle of female mammals when they are receptive to mating. Each stage is characterized by distinct physiological changes that prepare the reproductive system for potential pregnancy. Some species also experience a period of anestrus when reproductive activity ceases. Under regulation by gonadotropic hormones, ovarian follicles mature and estrogen secretions exert their biggest influence. mme9x, ek8j, vl3d, anny3, m1m61, ob9e, wpqdrq, otcu7j, hccbx, aep5d,