How to check semen consistency, density and sperm motility in artificial insemination of pigs

The consistency of normal semen is not great, similar to clear rice water; if the consistency is high, there is definitely a problem. Sperm density refers to the number of sperm in the semen and is related to the ejaculate volume; the larger the semen volume, the correspondingly lower the sperm density, and vice versa. The sperm density of normal semen is 1 to 3 billion per milliliter, and it is usually checked under a microscope. If the gap between sperm is equivalent to 1 sperm, it is "dense"; if equivalent to 1 to 2 sperm, it is "medium"; if 2 to 3, it is "sparse"; if there are basically no sperm, it is "none" and must be discarded. The standard for judging sperm motility under a microscope is the proportion of sperm moving in a straight line in the field of view. Sperm motility above 70% is normal and can be used for insemination. The sperm abnormality rate refers to abnormal sperm under the microscope, mainly broken tails, broken heads, presence of protoplasmic vesicles, large heads, double heads, double tails, bent tails, etc. Generally it must not exceed 20%, and the lower the better.