After semen is collected, it should be quickly placed in a constant temperature water bath at about 30°C to prevent a sudden drop in temperature causing a cold attack on the sperm. The action is required to be rapid, the sampling is representative, the evaluation result is sought to be accurate, and the semen quality should not be caused during operation. Being compromised, a comprehensive and comprehensive analysis of semen quality standards is required. Determine if the sperm can be used for preservation or insemination. Sensory inspection The sensory evaluation of semen is very important, mainly including odor, color and volume. The semen is judged whether there is odor or not. The semen with odor can not be used for insemination. It should be eliminated in time. The normal boar semen contains the unique micro odor of the boar semen. This odor is different from the odor of the fish, and there is no corrupt odor. The smell of the boar; the color of the normal boar semen should be grey or white, such as foreign body, hair, and blood in the semen. This indicates that the semen has been contaminated. Such semen can not be used for insemination or preservation. Caused by boar genital or genital disease caused by sperm extraction, and the occurrence of urine shows that the temperature is inappropriate when the sperm collection; boar average ejaculation volume of 250 milliliters, the range is 150 to 500 milliliters, found If the amount of ejaculate is too small, the cause must be ascertained. Only semen meeting the normal requirements can be further examined and handled. Microscopic examination Its main content includes the inspection of sperm motility, density and sperm morphology. Determination of sperm motility: sperm motility refers to the percentage of total spermatozoa in which the spermatozoa of the original semen moved linearly at 37°C. The measurement method is to drop a drop of the original sperm onto a heated microscope slide. The temperature of the microscope table should be stored at 37°C. Generally, the fresh spermatozoa rate should be above 80% when the activity rate is below 40%. Semen can no longer be used for insemination. Because the vitality of sperm is greatly affected by environmental conditions, in order to obtain objective and accurate results, attention should be paid to the following aspects when assessing: When checking vitality, it should be kept at a constant temperature; do not allow direct sunlight to reach the semen sample; Volatile chemicals or disinfectants; to see more than a few fields of vision, add together the assessment scores for each field of view and find the average. Determination of sperm density: The most common method is a white blood cell counter. Although the calculation method is relatively accurate, it takes time and labor to perform inspections after inconvenient sampling under production conditions. Now there are specialized instruments with high degree of automation to match spectrophotometers, computer processors, digital displays or printers. As soon as a drop of semen is added to the spectrophotometer, the desired sperm density and total number of sperm can be obtained quickly. Normal spermatozoa have an average sperm density of 250 million (between 100 million and 300 million). The spermatozoa with high sperm density are often cloudy. Sperm deformity examination: normal sperm morphology like pimple, abnormal morphological vitality is not high, in order to ensure conception rate must check the morphology of sperm. Sperm deformity is generally divided into four categories: abnormal head, large head, thin, slender, round, outline is not obvious, shrinkage, defects, double head, etc.; abnormal neck, neck enlargement, slender, twists, incomplete, double Neck, etc.; abnormal tail, bending, short, defect, double tail, etc.; abnormal acrosome, incomplete acrosome, abnormal shape. The acrosome integrity rate has the greatest impact on fertilization. Currently, conditional microscopes are used to directly check the integrity of the acrosome.
Socket Eyes are used for connecting conductor clamping devices to ball and socket type insulators. Made by malleable iron, hot dip galvanized to meet ASTM A153 specification.
Ball Eyes are used to attach ball and socket insulators to other associated hardware. Hot dip galvanized to meet ASTM A153 specification.
Thimble Cleivs are used for attaching guy to pole eye plate. Hot dip galvanized to meet ASTM A153 specification.
Turnbuckles are used as adjustable extension links to maintain proper tower clearance on assemblies at tower end.
Strain Clamp used for distribution and transmission line construction with all aluminum ACSR, or aluminum alloy conductor.
Transmission Hardware Fitting,Power Line Fitting,Wire Rope Thimble Clevis,Hot Line Socket Clevises Ningbo Yokelink Machinery Co.,Limited , https://www.yokelink.com