Wild Boar Estrus and Breeding
Wild boars are typically lean and robust, with a coat that is usually gray or gray-yellow in color. Adult sows weigh between 90 to 130 kilograms and are highly sensitive to environmental changes. Female wild boars usually have 6 to 7 pairs of teats and give birth about 2.5 times a year, with each litter containing 10 to 15 piglets. The ideal breeding period for wild boars is when they are between 5 to 6 months old and have reached a weight of 40 to 60 kilograms. When a female enters estrus, breeders often use the strategy of pairing early-born sows with early parity and late-born sows with later parity. During estrus, the external genitalia of the sow becomes noticeably red and swollen. The best time to breed is when the vulva turns dark purple, slightly shrinks, or when the sow stands still while being touched on the rump.
Breeding between male and female wild boars generally takes longer than with domestic pigs. Experienced breeders recommend using a repeated mating method, where mating is done every 6 to 8 hours. This approach can significantly improve the conception rate. During estrus, a male wild boar can be used to drive the sow for one or two days. At night, the male may mate several times. Once successful mating is confirmed, the boar should be removed. After 20 days, if the sow does not show signs of estrus again, it is likely that she has been successfully bred. On average, the estrous cycle of a female wild boar lasts about 18 days.
Pig Selection
Farmers who raise wild boars must have at least one or two purebred males. As the saying goes: "Good sows make good litters; good boars make good offspring." This highlights the importance of selecting high-quality boars. Choosing the right wild boar for breeding is crucial for the future quality of the herd. Purebred wild boars that match the typical characteristics—such as body length, leg height, and snout shape—are usually selected. Offspring from crosses between wild boars and domestic pigs often display traits that resemble domestic pigs rather than their wild ancestors. Therefore, hybrid wild boars are not suitable for breeding purposes. If purebred wild boars are unavailable due to limited resources, farmers should select third-generation hybrids with over 70% wild boar genetics. Inbreeding should also be avoided to ensure strong immunity and faster growth in the offspring.
Feeding Wild Boars
Wild boars are naturally omnivorous, feeding mainly on leaves and weeds. This diet remains largely unchanged under captive conditions. About 60% to 70% of their feed should consist of green vegetation such as grass and vegetables. Some farmers mistakenly use full-feeding methods designed for domestic pigs, which increases costs and leads to problems like excessive weight gain, poor backfat development, and imbalanced nutrient levels. These issues can cause difficulties in mating, such as sows being unable to stand or boars failing to mount. To prevent this, feeding should be controlled, with green feed as the main component, and exercise should be encouraged to maintain physical condition.
Nutrient-deficient boars require more crude protein and vitamins. A lack of these nutrients can weaken the boar's health, reduce semen quality, and result in low sperm count, thin semen, incomplete sperm development, and reduced fertility. Deficiencies in minerals like calcium, manganese, zinc, and selenium can also lead to gonadal degeneration and low libido. To ensure optimal reproductive performance, a balanced diet rich in protein sources such as fish meal, bone meal, soybean meal, shrimp, and silkworms should be provided year-round. Additionally, vitamin-rich green and juicy feeds should be included. In winter, when fresh greens are scarce, vitamin supplements can be added. For mineral deficiencies, feeding calcium-rich green feed and hay powder, along with phosphorus-containing bran, and adding an appropriate amount of bone meal, limestone, or shell powder is recommended.
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