Mainly by checking the following indicators to determine the species of boar semen quality.
(1) Semen ink In general, an electronic balance is used to weigh semen on a farm or artificial insemination station, and is measured in 1 ml per gram. Usually, once a boar collects the amount of jelly at the time of sperm extraction, adult boars are 200-300 ml, and some are as high as 700-800 ml. The amount of boar ejaculation should be based on the average of multiple seizures within a given period of time.
(2) Normal color of semen The color of semen is milky white, milky white or light gray. When the semen concentration is high, it is milky white, when the concentration is low, it is gray, watery and even transparent. The greater the density of the sperm, the more white the color, and the lighter the density.
(3) The semen of normal semen has a slight odor. Semen with foul odor is a manifestation of inflammation, semen polluted by the foreskin is also very odor, semen with urine, ammonia and other odors can not be used.
(4) Semen pH can be measured with a pH test paper. Normal semen is weakly alkaline or neutral, and PH is between 7 and 7.8.
(5) Sperm Vitality Examination Semen was heated to 35-370C using a thermostatted stage, and the spermatozoa were observed under a microscope of 100-400 magnification. The percentage of spermatozoa that moved straight forward indicated that the spermatozoa were viable. Generally speaking, the number of 0.1 in the range of 0.1 to 1.0 indicates that the semen and the freshly diluted semen must not be less than 0.7, and the semen stored for more than 24 hours should not be less than 0.6 before use, otherwise it cannot be used.
(6) Sperm density refers to the number of sperm contained in each milliliter of semen, which is counted with a blood cell counter plate or measured with a semen density meter. See the instructions for use of the semen density meter.
(7) Sperm Abnormality Rate The rate of malformation refers to the percentage of abnormal spermatozoa. In general, the deformity rate must not exceed 18%. It can be measured by ordinary microscope, but it should be stained with Eosin or Giemsa. The examination method was to observe the spermatozoa smear after 400 to 600 times the microscope, and calculate the percentage of the total number of spermatozoa that the abnormal sperm occupied. Three fields of view are usually checked when counting, and more than 500 sperm are counted. Pig sperm deformity rate of more than 20% should not be used. Every boar is required to check the rate of sperm abnormality every 2 weeks.
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