Before the cow is fertilized, the breeder's fingernails should be cut short and blunt, and disposable plastic film gloves should be worn on the arms. The arms should be coated with water or a small amount of lubricant, and the dirt around the cow's external genitalia should be cleaned before the insemination. The breeder should close the five fingers of the left hand and pinch them into a cone shape, slowly insert them into the rectum, take out the feces, and probe the cervix through the rectal wall.

Using a bovine ultrasound to observe the position of the uterus during the observation period, the outer end of the cervix is half held in the palm of the left hand, so that the cervix is tightly attached to the pelvic cavity. Then, with the left hand and the right hand, the vas deferens containing semen is inserted into the vagina at an angle of 35-45 degrees from the vaginal opening, with an upward angle of 5-12cm mainly to avoid the urethral opening. The vas deferens is then horizontally inserted forward to reach the outer opening of the cervix, moving forward in a spiral shape and inserted into the cervix. When the vas deferens feels to pass through 2-3 transverse folds inside the cervix, it can start to slowly ejaculate.

When ejaculating, achieve light insertion, appropriate depth, slow injection, and slow withdrawal. After withdrawing the vas deferens, hold the cervix tightly with your left hand to prevent semen from flowing back when the vas deferens is withdrawn. Special attention should be paid during operation: when grasping the cervix, the palm position should not be too forward or too backward, otherwise it is difficult to insert the vas deferens into the cervix,

Use bovine ultrasound for guidance. During insemination, the cow is restless and agitated. At this time, the vas deferens gun should not be held too tightly, but should swing along with the cow's hindquarters. When inserting the vas deferens into the vagina and uterus, it should be inserted forward while moving, and excessive force should not be used to prevent the vas deferens from damaging the mucosa and causing uterine perforation. It is necessary to use a cow ultrasound for observation.

The advantages of rectal grasping method for insemination: simple, convenient, and safe operation. Cows do not experience pain or stimulation during insemination, and it is also suitable for first-time cows. The insemination process is relatively quiet and will not cause damage to the vaginal mucosa or bacterial infection. There is no damage to cows, and it can be performed under B-ultrasound observation. The main reason is that semen can be directly input into the deep uterus without backflow, and the conception rate is more than 10% higher than using an opener.

link: https://www.bxlimage.com/nw/596.html