Boar estrus and breeding
Wild boars are coarse and thin, usually grey or gray-yellow. Adult sows weigh 90 to 130 kilograms and are sensitive to the external environment. Female wild boar nipples generally have 6 to 7 pairs, with an annual output of 2.5 tires, generally 10 to 15 per fetus. The suitable breeding time is from 5 months to 6 months after birth, and the body weight is 40 kg to 60 kg. In the case of estrus in female wild boars, the principle of using early-born sows with early and sows with late parity is generally adopted. When wild boar estrus occurs, the external genitalia is markedly red and swollen. When the external genitalia changes from red to dark purple, from swollen to slightly shriveled, or the sow's buttocks are held by hand, the best breeding time is when the sow stands still. Male and female boar breeding time takes slightly longer than domestic pigs. Based on experience, it is advisable to adopt a compounding method, that is, repeat the mating once every 6 hours to 8 hours. This can significantly increase the conception rate of sows. When the female wild boar is estrus, the boar can also be used to drive the boar to the sow for 1 day to 2 days. At this time, the male wild boar can crawl and mated several times at night. After confirming the successful mating, the wild boar was expelled. After 20 days, whether or not the wild boar is still oestrus is observed. In general, the estrous cycle of the female wild boar is 18 days. If no estrus occurs, the boar has been successfully mated.
Pig selection
The farmer engaged in wild boar breeding must have 1 to 2 purebred wild boars. As the saying goes: The sows are good and they have a good nest. The boars are good and they are good. This shows the importance of breeding boars. Choosing a good wild boar for breeding is of crucial importance to the pros and cons of future generations. Generally, purebred wild boars that match the characteristics of wild boars, such as their body length, leg height and mouth tip, are selected as breeding pigs. The offspring produced by the special wild boars that are crossed by wild boar and domestic pigs are left behind. The offspring that have been raised have a phenomenon of returning to the ancestors, that is, the pigs produced are not like boars but like pigs in appearance. Therefore, binary hybrids of wild boars are not suitable for seed use. In case of non-use special wild boars for breeding boars, if conditions are limited, we must also select ternary hybrid special boars with more than 70% wild boar virginity as breeding pigs, and also prevent inbreeding in kinship so that their offspring can resist disease. Strong, grows quickly.
Breeding pigs Feral boars are wild animals and they are mainly eaten with leaves and weeds. This property is preserved under artificial rearing. 60%-70% of the feed is mainly green grass such as green grass and green vegetables. Some farmers used the experience of raising pigs to feed wild boars with full-priced feed, which not only greatly increased the cost, but also resulted in the lack of restrictions on the pre-growth of back-breeding pigs and the excessively high levels of nutrients in the diet. Fertilizers, which are too heavy, cause boars to cross over or the sows cannot cross the boar, resulting in difficulty in breeding or inability to breed. At this time, wild boars should be restricted for feeding, green feed should be the main food, and exercise should be strengthened.
Nutrient-deficient boars require more crude protein and vitamins, such as insufficient diets, which can affect the boar's constitution and semen quality, resulting in less semen and thin sperm, incomplete sperm development and poor vitality, decreased fertility rate, and even Loss of breeding ability. The lack of minerals such as calcium, manganese, zinc, and selenium can also lead to degeneration of the gonads and sluggish libido. Therefore, it is necessary to provide a balanced supply of nutrients for boars. Animal feeds rich in crude protein, such as fish meal, bone meal, soybean meal, shrimp, cocoon, etc., should be supplied all year round. Rich, vitamin-rich, green and juicy feeds should also be fed. In the northern winter, when the green and juicy feed is insufficient or the male wild boar is mated, vitamin supplements can be added. Such as the lack of minerals, usually feeding a variety of more calcium-rich green feed and hay powder, more phosphorus containing bran and add the right amount of bone meal, stone meal or shell powder.
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