How to determine the cow's estrus period

External observation

Look at the external performance: Cows in the early stages of estrus are excited, sensitive, and yelling, and do not accept other cattle. During the estrus period, the climb was accepted, and when it was climbed, it was lifted and the limbs did not move. At the end of estrus, the cow gradually entered a period of calm and gradually no longer accepted the climb. Look at the changes in the vulva: When the cow is in heat, the pus is swollen and full, soft and slack, and then the vulva slowly subsides from swelling, shrinking and showing wrinkles. Look at changes in the vaginal mucosa and the cervix: In the early stages of estrus, the vaginal wall is congested and flushed and shiny. During the estrus period, the cervix is ​​ruddy and the neck is open. It can hold about one finger. At the end of estrus, the vaginal mucous membrane congestion and flushing gradually subsided, and the cervix was slowly closed. See the changes in the outflow of mucus in the pus: The mucus that is discharged in the early stage of estrus is relatively clear, like egg white, and it is poorly tied. During the estrus period, the mucus discharged from the cow's vulva is like a glass rod. It has a high degree of distraction and is easy to adhere to the coat on the tail, hip, or hindquarters. The mucus discharged before ovulation became white and thick and thick, and the amount of mucus decreased, and the distraction became worse. You can use the thumb and index finger to get a small amount of mucus, if you pull 5 to 7 times (distance 5 ~ 7 cm), this time the cow is close to ovulation, should be in the next 3 to 4 hours insemination, if more than 8 times It is too early for the person to pull 3 to 5 times, which is too late. Look at milk production: When most cows are in heat, milk production will decline.

Rectal examination

Identification is primarily performed by touching changes in the ovaries and uterus. In the early stages of cow estrus, the rectum was checked for soft uterus, one side of the ovary was enlarged, and follicles were found on the ovaries. There was no elasticity. This period is maintained for about 10 hours. Neutral rectum examination during the estrus uterus soft, follicle volume increased, diameter 1 ~ 1.5 cm, prominent in the ovary surface, strong elasticity, a sense of volatility. This period is maintained for 8 to 12 hours. At the end of the estrus rectum, the cervix became soft and the wall of the follicular wall became thinner. The fluctuation was very obvious. It was ripe grape-like and had a touch and feel. This period is maintained for 8 to 10 hours.

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