In order to discover the estrus of cows in time, improve the conception rate, the methods for identifying estrus in cows are as follows:
First, the external observation method: When the cow is estrous, it is indefinitely standing, and the buzzing, viewing, loss of appetite, bowing, tail urination, urinary frequency, external genitals, wetting, swelling, transparent mucus outflow, vaginal mucous membrane flushing and so on. The estrus period is divided into three stages: early stage, middle stage and final stage.
1, early estrus; accept the climb, sharp eyes, fingers press the cow's hindquarters cross, cows swinging ears, docile temperament and looked back, there is mucus outflow of the vulva, traits are more viscous, long and continuous extension.
2, mid-estrus: the most estrus estrus; cows are very active sexual impulses, to accept the climb and climb across it, the tail with mucus, mucus out of transparent, pulled very long, but the middle of the break, the hand press the cross, The cow is loining and the tail is holding up.
3, end of estrus: do not accept climbing, mental stability, mucus reduction, a little white and cloudy, hand press the waist, refused to accept and avoid, the tail close to the vulva instead of lifting, the genital gradually dry, wrinkles began to recover .
The entire estrus period lasts approximately 13-17 hours. The shortest hours, up to a maximum of 30 hours, approximately 60% of the estruss of cows appear from night to morning, and must be observed.
Second, the bull test method: According to the cows to accept the test bull or other cows to climb or cross each other, and other cattle stand still when climbing, this is a estrus cow.
Third, the vaginal examination method: Wash with an opener, apply lubricant after disinfection, insert the vagina, check the vaginal changes through the mirror or flashlight, cow estrus, insert the opener without resistance, vaginal mucous membrane congestion, color Red, bright and moist surface, there is a transparent mucus flow, cervical congestion, relaxation, opening, there is mucus outflow, mucus gradually thickens with the increase in estrus time, amount from less change, the amount of late mucus gradually decreased, slightly viscous and cloudy .
Four, rectal examination method: using the arm into the cow rectum, across the rectal wall touch the ovarian follicle development situation to judge the development or not. Follicular development can be divided into three phases: the first phase (follicle appearance phase) has one side of the ovarian follicle development, the volume increases, this time the follicular diameter of about 0.5 cm, this time is equivalent to early estrus. In the second phase (follicle development period), the follicle develops further, with a diameter of about 1-1.9 cm, showing a small spherical shape that protrudes from the surface of the ovary and fluctuates markedly. At this time, it corresponds to the middle to the end of estrus. In the third phase (follicle maturation period), the volume of follicles increased, the follicle fluid increased, and the fluctuation was obvious. At the time of examination, there was a feeling of touch, which was equivalent to the late stage of estrus.
5. Mucus examination method: Remove the mucus from the uterine cervix and apply it on a glass slide. Observe under the microscope that the cow is in heat. The mucus is flaky or nebulous. If the mucus is flaky, it is estrus. If there is a nebula pattern for the end of heat.
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