(1) ejaculate volume: the filtered semen volume is called ejaculate volume, which is generally 200 ~ 300ml, and the maximum is 400 ~ 500ml.
(2) Color of semen: Normal semen is milky white or grayish white. If the mixture of urine is yellow-brown, the mixture of blood is red, and the mixture of concentrated juice is yellow-green, and the mixture of flocs indicates that boars have accessory gonadal inflammation, these semen can not be used for fertilization.
(3) Smell of semen: Normal semen has a special fishy smell, and fresh semen is sticky. If it is smelly, it belongs to abnormal semen.
(4) The pH of semen: Dip a little semen in the acid-base test paper with a glass rod. In contrast, the pH value of normal semen is 6.9 ~ 7.5. If the pH value is above or below this range, it cannot be used.
(5) Semen density: refers to the number of sperm, which is generally estimated. That is, drop a drop of semen on the glass slide, gently cover the glass slide and observe it under a microscope of about 300 times. If the whole field of vision is sperm, it is "dense"; If the distance between sperm in the field of vision is the length of a sperm, it is "medium"; If the distribution of sperm in the field of vision is sparse, the gap is large, and the distance between sperm exceeds the length of a sperm, it is "sparse".
(6) Sperm vitality: refers to the ability of sperm activity. Generally speaking, sperm motility is expressed according to the percentage of sperm moving linearly under the microscope. The more sperm move in a straight line, the stronger the sperm motility and the higher the pregnancy rate after insemination. The motility is lower than 0.6 (60% linear movement), and semen with abnormal sperm above 10% is generally not used. Inspection method: first drop a drop of semen on the glass slide, cover the glass slide (be careful not to generate bubbles), and then observe it under a microscope of about 300 times.