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Estrus cycle in farm animals

Estrous cycle in farm animals, estrous cycle in bitch, proestrus, estrus, met estrus, diestrus, time of ovulation, estrogen and progesterone level during estrous cycle. https://drive.google.com/file/d/1Hp6W... Estrous cycle in farm animal Rhythmic expression of sexual receptivity (estrus) with a limited period of time occur at a periodic intervals. For example, cow comes into estrus (sexual receptivity) every 21 days intervals until get pregnant. One estrus to next estrus is one estrous cycle. Ovulation occurs after the onset of estrus or at the end of estrus in farm animals exept cow (10 -15 hours after the end of estrus). It is the ovulatory interval. Stages of estrous cycle Estrus, met-estrus, diestrus and proestrus. The expression of sexual receptivity is the result of the gonadal hormones (estrogen, progesterone) in co-ordination with nervous system. During the pro-estrus and estrus stage, the ovary is in follicular phase. There is rapid follicular growth and its ovulation in most farm animals. The estrogen become predominant. The proliferation of endometrial lining and the development of endometrial gland is due to estrogen. Estrogen is also responsible for the sexual behaviour of the animals in synergistic with progesterone. During Met estrus and diestrus, the ovary is in luteal phase, progesterone become predominant. The uterus is in secretory phase under the influence of progesterone.