Breeding power of boars is inseparable from the quantity and quality of semen. To improve the breeding ability of breeding boars, we should start with breeding management and breeding.

First, improve the breeding level of boar

Nutrition is the material basis for maintaining the life of a boar, producing sperm, and maintaining a strong breeding power. The nutritional requirements of the boar should be determined based on the boar's body condition, breeding tasks, and the quantity and quality of semen.

1. Nutrition needs. Feeding a full-price nutritional diet and implementing reasonable feeding can maintain the boar's body condition, energetic, sexual desire, good semen quality, and high breeding ability. However, the nutritional level should be appropriate. If it is too high, the body fat of the boar will be excessively deposited. Too much fat or too low will cause loss of fat and protein in the boar, forming a negative balance of carbon and nitrogen and becoming too thin. Protein has a great influence on the quantity and quality of semen, sperm motility and life span. The digestive energy per kilogram can not be lower than 12.97 MJ, and crude protein is suitable for 14%-15%. The types and sources of protein feeds are as diverse as possible to increase the biological value of the protein. In order to increase the breeding ability of breeding boars, 5% animal feed can be added to the diet. The ratio of dietary calcium to phosphorus is preferably 1.25:1. In addition, mineral elements such as selenium, manganese, and zinc should also be supplemented. It is recommended that no less than 0.15 mg, 20 mg, and 50 mg of each kilogram of diet be used. If the diet lacks vitamins A, D, and E, the boar's sexual reflex decreases and semen quality decreases. If it is severely lacking for a long time, it will make the testicle swollen or dry and shrink, losing the breeding ability. Niacin and pantothenic acid should also be supplemented at the right time.

2. Feeding methods. According to the mating task of the boar within one year, two feeding methods are available: First, the sow is introduced throughout the year and the boar is required to bear the perennial breeding task. Therefore, the boar must be maintained in a balanced manner throughout the year. The second level of nutrition is the practice of seasonal delivery of pig farms, gradually increase the boar nutrition 1 months before mating, maintain a high level of nutrition during the mating season, in the non-matching season, only need to maintain the nutrients of the breeding condition.

3. Feed and feeding technology. Feeding should be regularly quantified, each time you do not feed over the full, the feed volume should not be too large, should be mainly concentrated material, so as not to cause the belly and affect the use of breeding. It is advisable to use raw and dry ingredients or wet mixes, add appropriate amount of green and juicy feed, and provide enough clean drinking water.

Second, the kind of boar management

1. Feeding in groups. Boars can be fed singly and in small groups. Single-circle feeding can reduce external disturbances and prevent cross-overs. Boars can rest quietly and have normal appetite, thus saving feed. Small groups feeding boars must be grouped together, usually in two laps, up to a maximum of three. The small group rearing is easy to manage, and it is helpful to improve the utilization rate of housing and the raising efficiency. Boars that are fed in groups cannot be immediately circulated after breeding, and should be rested for 1 to 2 hours before the odor disappears. For small boars feeding boars that have participated in mating, single-circle breeding and gregarious movements may also be adopted.

2. Appropriate exercise. Brush and hoof often. Reasonable movement of the boar can promote digestion, enhance physical fitness, avoid obesity, and increase breeding ability. Therefore, in the non-breeding period and the mating preparation period, it is necessary to intensify exercise, and the mating period should be moderately exercised. Brushing can reduce skin diseases and ectoparasitic diseases, and can promote blood circulation and enhance libido. This is also the best time for breeders to tune boars so that boars can be docile and obedient to management, facilitating collection and assisted breeding. Bad hoof shape affects activities and mating, and hoofs should be fixed regularly. Should pay attention to the protection of the boar's limbs and hooves, on the hard texture of the ground, should be paved with grass or wood chips, in order to reduce the occurrence of limb disorders.

3. Sunstroke and cold weather. In summer, high temperature measures must be taken according to local conditions, such as ventilation, watering, bathing, and shading, to prevent the negative effects of heat stress. In order to reduce the consumption of feed and the occurrence of diseases, winter pig houses should be kept warm and cold, and they can be solved by means of padding grass and buckle plastic sheds.

4. Weigh regularly. Boars should be weighed on a regular basis and the effects of feeding should be checked on the basis of weight changes in order to adjust the diet in time. Frequently inspect the semen quality, adjust the nutrition, exercise and breeding times according to the quality of the semen, in order to ensure the health of the boar and improve the conception rate.

The boars should be properly arranged for feeding, drinking, grazing, sports, brushing, sunbathing and rest so that boars can develop good living habits to enhance their fitness and improve their ability to breed.

Third, boar breeding use

Breeding use is the sole purpose of raising boars. It is not only related to feeding and management, but also depends largely on the initial age and intensity of use. The method of mating includes artificial insemination and artificial insemination. Artificial insemination has the advantages of improving the utilization of boars, reducing costs, and avoiding the spread of diseases. However, the artificial insemination technology of pigs in our country started late and has not yet reached the ideal state. The semen rate of semen is still low, the production cost is high, and the difference in freezing effect is large, so further research is needed.

The initial age of boars varies with species and feeding and management conditions. China's breeding breeds and hybrid boars have been sexually matured from 4 to 5 months of age, but the most suitable initial mating age, small early maturing varieties are from 7 to 8 months old, and weights about 75 kilograms are about 9 to 10 months old, with a weight of 100 Kilograms are appropriate.

The pros and cons of boar semen quality and the length of years of use depend greatly on the strength of use. Adult boars older than 2 years are suitable for breeding once a day, but they can also be used twice a day if necessary, but not every day. If boars are continuously bred every day, they should rest 1 day per week. Young boars are bred every 2 to 3 days. In the present situation, 1 boar can bear the task of breeding 20 to 30 sows.

Under the condition of ensuring the complete and reasonable nutrition of boar species, creating a comfortable microclimate environment and using it properly are important guarantees for improving breeding ability of breeding boars.