Rating ruler, also known as a grating ruler displacement sensor (grating ruler sensor), is a measurement feedback device using the optical principle of grating.Grating ruler is often used in the closed-loop servo system of CNC machine tools, which can be used to detect linear displacement or angular displacement. The output signal is digital pulse, which has the characteristics of wide detection range, high detection accuracy, and fast response speed. For example, in the CNC machine tool is often used to detect the coordinates of the tool and the workpiece, to observe and track the tool error, and to play a role in compensating the tool motion error. Rating Ruler Zhejiang dexun instrument technology co., ltd , https://www.dexunmeasuring.com
Technical measures to improve rabbit hair production and quality
In order to enhance the quality and yield of rabbit hair, several key strategies should be implemented. First, the selection and breeding of improved varieties play a crucial role. Different breeds or lines exhibit significant variations in hair production and quality. For example, German long-haired rabbits have a high wool yield, reaching 1600–1800 grams, with 95% fine hair and only 2–5% coarse hair. Their hair is also less prone to tangling, making it ideal for commercial use. Similarly, French long-haired rabbits offer a balanced wool yield and a high gross hair rate. In recent years, China has developed new breeds that are well-suited for different purposes, offering both high yields and superior quality.
When selecting breeds, it's essential to focus on genetic improvement through careful selection and mating. Long-haired rabbits show strong heritability in terms of wool production, allowing for individual selection based on direct measurements of wool quantity and quality. During the initial selection phase, rabbits producing less than 30 grams of wool in winter and spring, or less than 20 grams in summer and autumn, should not be bred.
Hybridization is another effective method to improve low-yield or poor-quality groups. By introducing high-performing males into the breeding program, the overall productivity and quality can be significantly enhanced.
Female rabbits generally produce more hair than males, with a difference of up to 25%. Additionally, females tend to have lower hair blocking rates. Castrated males also show higher hair yields. Therefore, increasing the proportion of females in the population and castrating males can lead to better results in hair production.
Maintaining a balanced age structure within the herd is vital. Younger rabbits (under one year) typically have lower yields and poorer quality. Once they reach one year of age, their wool production increases rapidly, peaking between 420 and 490 days. After this period, production declines by about 10–15% annually. Male rabbits experience a more rapid decline in performance. The optimal age for hair production is between 1 and 3 years, so it’s important to maintain a high proportion of rabbits in this age range.
Nutritional management is equally important. Rabbit hair is primarily composed of keratin, which contains 16.8% nitrogen and 40.2% sulfur. A diet rich in protein and sulfur-containing amino acids supports hair growth. It is recommended that protein content in feed be around 17%, with sulfur amino acids at least 0.6%, and lysine at 0.65%.
Increasing the density of hair follicles is another key factor. Secondary follicle development occurs mainly during late pregnancy and early postnatal stages. Ensuring proper nutrition for lactating does and providing adequate care to kits can help boost follicle numbers.
Supplementing feed with trace elements such as zinc, calcium sulfate, and cobalt can enhance hair growth. Studies have shown that adding these elements can increase wool yield by up to 11.3%. Additionally, using additives like Rabbit Bao III can improve wool production by 18.6%, while rare earth elements can increase yield by 8.5–9.4% and improve the quality of high-grade hair.
Proper management is essential for maintaining hair quality. Single-cage housing helps keep the environment clean and reduces contamination. Regular grooming prevents tangles, and maintaining hygiene through cleaning and disinfection minimizes dirt and disease risks. Proper cage maintenance ensures that rabbits do not escape and remain healthy.
Harvesting techniques should be optimized. Shearing is preferred in summer, while plucking is more common in winter. This approach not only boosts yield but also supports the health of the animals. Grading the wool properly and shortening the growing period can further increase production.
Shearing techniques must be precise. Skin should be tightened before cutting, and the process should follow a specific sequence: back, body, jaws, head, hips, and limbs. Avoid cutting the two knife hairs, and separate good from secondary hairs during the process. Removing contaminated or matted hairs improves the final product quality.
Disease prevention is critical. Conditions like sputum, fungal infections, and skin diseases can severely impact hair quality. Daily inspections and prompt treatment are necessary. For mange, oral or injectable treatments like necrosis are effective. Fungal infections can be treated with griseofulvin, administered at 40–70 mg/kg daily for 15 days, with a 5–7 day break between courses.
By implementing these comprehensive strategies, rabbit farmers can significantly improve the quality and productivity of rabbit hair, ensuring sustainable and profitable operations.