The estrus period of mutton sheep is the result of a combination of environmental factors such as seasonality, light, latitude, altitude, temperature, and nutritional status. Seasonality is the main environmental factor affecting the estrus of mutton sheep. Seasonal estrus in sheep is the result of long-term natural selection and is a concrete manifestation of adaptation to the environment.
Both sheep and goats are short-lived seasonal estrus animals, that is, heat in late summer and autumn, and estrus in autumn.
After the ewes reached sexual maturity, there was a periodic ovulation on their ovaries. We described the complex physiological processes occurring during the first and second ovulations of the whole body and its reproductive organs as the estrus cycle. The estrus period of the sheep is 24 to 26 hours, the average estrus cycle is 17 days, the goat's estrus period is 24 to 28 hours, and the average estrus cycle is 21 days.
Ram's complete sexual behavior includes sexual urges, courtship, penile erection, crawling, penis penetration into the vagina, ejaculation, and withdrawal from the ewes. In estrus, estrogen stimulates the sexual center of the ewes with the participation of a small amount of progesterone. At this time, the ewes have sexual behaviors, sexual excitement, a series of changes in the reproductive tract, follicular development, and ovulation behavior and physiological responses.
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