Direct observation method: 12-18 hours after the onset of oestrus; receiving other cattle to crawl, from irritability to quiet; mucus is small, cloudy or transparent and thick. Vaginal examination method: The swelling of the vulva began to disappear, and the cervix was garlic-like, pink, or purple-brown, moist and well-opened. Rectal examination: the rectal examination of the follicles on both sides of the ovary to determine whether the estrus, according to whether the follicle protrudes from the ovary surface and size, elasticity, volatility and ovulation to determine whether the estrus and breeding or insemination is appropriate period. In the early stages of estrus, the ovaries increase, and the follicles protrude from the surface of the ovary and have a diameter of less than 8 mm. They are hard. At the follicular maturation stage, the follicles protrude from the surface of the ovaries. The diameter of the ovary can reach 10-24 mm and the wall of the follicles becomes thin. It is flexible and has a feeling of touch. At the same time, the uterus has a sense of contraction (tension) after touching the uterine horn. There are follicles about 1.5 cm in diameter on the ovaries, and there is a touch and feel. Breathing filters provide an effective barrier that prevent cross contamination between patients, breathing systems, respiratory and anaesthetic equipment, and the clinical environment. They are widely used across the hospital particularly in the operating theatre, critical care, lung function units, and respiratory care units.
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How cow estrus is judged