Semi-automatic Video Measuring Machine Features of semi-automatic Video Measuring Machine: An automatic zoom optical telephoto lens is a lens specially designed to correct the parallax of traditional lenses. It can be used within a certain object distance range to ensure that the magnification of the obtained image does not change with the change of object distance. This is an important application for situations where the measured object is not on the same surface. Semi-automatic Video Measuring Machine,Semi-automatic Video Measuring Instrument,Auto Focusing Measuring Instrument Manufacturer in China Zhejiang dexun instrument technology co., ltd , https://www.dexunmeasuring.com
The main body of the equipment is made of high-precision natural granite, which has stable temperature characteristics and resistance to aging deformation, ensuring measurement stability and long-term accuracy.
High precision fully closed-loop automatic zoom optical lens
Telecentric optical principle: Adopting a parallel light path optical design, the size of the object's image does not change with the distance from the lens, resulting in additional measurement errors in the perspective effect.
Technical measures to improve rabbit hair production and quality
Improving the quality and yield of rabbit hair requires a comprehensive approach that involves multiple strategies. First, the selection and breeding of superior varieties play a crucial role. Different breeds exhibit significant variations in hair production and quality. For instance, German long-haired rabbits are known for their high yield, with an average of 1600 to 1800 grams of hair per year, and a fine hair content of up to 95%. These rabbits also produce less coarse hair, making their fibers ideal for high-quality textile production. Similarly, French long-haired rabbits offer a balanced wool yield and high gross hair rate. In recent years, China has developed several new breeds or lines tailored for specific purposes, offering both high yield and excellent hair quality.
When selecting breeds, it is essential to focus on proper breeding and crossbreeding practices, as poor selection can lead to rapid genetic degradation. From a genetic perspective, long-haired rabbits have strong heritability in terms of wool yield, which allows for effective individual selection based on direct measurements of fiber quality and yield. During the initial selection phase, rabbits that produce less than 30 grams of wool in winter and spring, or less than 20 grams in summer and autumn, should not be kept for breeding.
Second, hybridization is an effective method to improve low-yield or low-quality groups. By mating high-yielding males with females, breeders can significantly enhance the overall performance of the herd. Studies have shown that this approach is highly effective.
Third, increasing the proportion of female rabbits in the population can boost hair production. Female rabbits generally produce more wool and have a lower hair tangling rate compared to males. Castrated males also show higher hair yields. Therefore, for commercial hair production, raising more females and castrating males can significantly improve productivity and fiber quality.
Fourth, maintaining a balanced age structure is essential. Young rabbits under one year of age typically have lower hair yield and poorer quality. After reaching one year, their wool production increases rapidly, peaking between 420 and 490 days of age. However, production declines by 10% to 15% annually after that. Male rabbits tend to experience a more dramatic decline in quality. The optimal age range for hair production is between 1 and 3 years. To maintain this, a higher proportion of rabbits aged 1 to 2 years should be maintained in the population, with regular replacements to ensure consistent output.
Fifth, ensuring a balanced and nutrient-rich diet is vital. Rabbit hair is primarily composed of keratin, containing 16.8% nitrogen and 40.2% sulfur. A diet rich in protein and sulfur-containing amino acids helps improve hair growth. It is recommended that the diet contain about 17% protein, with at least 0.6% sulfur-containing amino acids and 0.65% lysine.
Sixth, increasing the density of hair follicles can significantly enhance hair yield. This depends largely on the number of secondary hair follicles, which develop during late pregnancy and early postnatal stages. Proper nutrition and care during these critical periods can help increase follicle numbers, leading to better hair production.
Seventh, using specialized feed additives can further boost hair yield. For example, adding 0.15 mg of zinc chloride and 0.4 mg of calcium sulfate per kilogram of body weight daily can increase hair growth by 6.8%. Adding 0.1 mg of cobalt chloride can result in an 11.3% improvement. Other supplements, such as rabbit Bao III additive, have been shown to increase wool yield by 18.6%, while rare earth elements can improve both yield and quality by up to 9.4% and 43.44%, respectively.
Eighth, effective management is key to maintaining high-quality hair. Keeping rabbits in single cages ensures cleaner hair and reduces contamination. Providing grass racks prevents soiling, and regular cleaning and disinfection help maintain hygiene. Grooming the rabbits regularly prevents matting, which can reduce hair quality. Additionally, ensuring that cages are intact and secure prevents rabbits from escaping and getting contaminated.
Ninth, proper shearing techniques are essential. Shearing is typically done in summer, while plucking is preferred in winter. This practice not only improves yield and quality but also promotes rabbit health. Sorting the wool by grade and keeping it organized is important. Shortening the growing period and increasing the frequency of shearing can further boost production.
Tenth, improving shearing techniques involves cutting close to the skin without damaging the primary hairs. The correct sequence is to shear the back, then the sides, head, hips, and limbs. Avoiding the two knife hairs and separating good from secondary hairs enhances the final product. Removing contaminated or matted hairs also contributes to better quality.
Eleventh, disease prevention is critical. Conditions like sputum, fungal infections, and skin diseases can severely impact hair production and quality. Daily inspections and prompt treatment are necessary. For mange, treatments such as oral or injectable necrosis agents can be used. Fungal infections can be treated with griseofulvin, administered at 40–70 mg/kg body weight, with a 15-day course followed by a 5–7 day break before the next round.