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First, the use of boar rules
1.8 to 12 months old 3 times/week, with 1 sow;
2. More than 12 months of age 5-6 times / week, with 2 sows;
3. After each breeding (with a sow), the boar must rest for 1 day;
4. When the sow has been estrus and has been bred once or twice, at the same time as the breeding boar refuses to be bred, it cannot be replaced with another boar;
5. Pay special attention to observing the boar's heat stress and apparent loss of libido, in which case the boar must rest.
Pay close attention to the use of boars and do a good job of checking the return of sows for 18 to 24 days and diagnosis of 30 days of pregnancy. These indicators are very good signals reflecting the status of boars. Over a period of time, the fertility rates of different boar mating sows are different. Young boars younger than 12 months of age have not yet reached maturity. Only when the young boars mature, can the maximum amount of ejaculate and sperm density be achieved. Overuse of young boars that have not matured before 12 months of age will reduce sow fertility, mating rates and litter size. In order to achieve the best fertility rate, it is very important to restore the boar as much as possible between 20 and 24 hours after two consecutive mornings of breeding. This can ensure a one-time ejaculation, increase sperm density and ensure fertilization rate.
2. When using boar boars for boars, use records must be entered on the frequency of use of boars. Regular monitoring of the frequency of use of boars should be carried out, and regular boars should be carried out based on the monitoring results. This helps management. All with matching sows and rationalized management of boars.
Weekly breeding and estrus inspections require boars, and the weekly boar rest must be balanced and organized because boars are needed every day.
The boars are used to conduct a comprehensive evaluation of boars and the results of the evaluation will be applied to boar breeding programs. The boars are used in exchange for breeding boars with heavy production lines and estrus identification.
Conditions for boars to rest: 1. sick, legged and gradually thin boars; 2. slow-breeding boars; 3. excessive use or boar frequency table showing the need to rest boars, because these boars Has reached its maximum frequency of use.
The boar usually rests for 1 to 7 days. If it is due to disease or injury, it can rest for up to 4 weeks. Normally healthy boars generally cannot rest for more than two weeks. This can cause short-term azoospermia. The boar boar individual is necessary, and a reasonable boar management program for the boar is necessary to maintain the conception rate and delivery rate. As a management technique, the boar frequency meter must reflect the state of the boar: whether it is resting or in use, and the degree of use.
Third, the impact of heat stress on the quality of boar semen Pork on the heat regulation ability is very poor, to provide breeding boar a comfortable environment is very necessary, boar particularly sensitive to high temperature stress. The occurrence, formation, development, and maturation of boar spermatozoa take at least 40 days. The epididymis on the outside of the testis has the function of transport, maturation, storage, and capacitation of sperm. It takes 12 days for the sperm to move in the epididymis. Once boar heat stress has not been detected after 2 to 3 weeks, when heat stress occurs, it will inevitably lead to a decrease in sperm motility, total sperm count and semen density, and an increase in abnormal sperm concentration. Therefore, once the boar is subjected to heat stress, it usually takes 7-8 weeks for the quality and quantity of semen to return to normal. In practice, the following five measures are taken to prevent heat stress from affecting boars:
1. Adjust the air flow rate and fan speed so that the air flow rate is within the normal range.
2. Apply dripping cooling measures.
3. Prepare and debug various cooling measures and methods in the spring. a. Debugging and lubricating various mechanical equipment for cooling; b. Clean the tap water filter and repair the awning, check the ventilation inside and outside the house, check all the thermometers and prevent and control measures, and ensure that they are all in the proper state.
4. The daily breeding time should be as early as possible to ensure sufficient time for full breeding. The estrus inspection procedure should be completed before 9:00 a.m.
5. The afternoon mating is the most important factor to ensure the optimal delivery rate, and it is necessary to breed at the time of heat.
IV. Pilot boars The trial boars are boars from vasectomy. Sperm cannot be exported from the vas deferens. This boar does not have fertility. They are mainly used for estrus identification during artificial insemination. In addition to the estrus identification, according to the records of the United States Decca company, it can also be used for false mating. This mating can stimulate the insemination process by stimulating the sow's reproductive tract.
Trying for a boar is necessary, and the trial boar can be used for unlimited breeding and the breeding time is as long as possible. When trying boars are too big, too thin, sick, sick or have no sexual desire, they must be eliminated. Although they do not have fertility, these boars are still boars and must comply with the guidelines for the handling and safe use of boars.
Fifth, boar management training Pigs are very smart and easy to tune the animals, it is as easy to form bad habits and good habits. If you beat or abuse a boar with sticks, sticks, iron bars, or other things, the boar will be very aggressive against people who abuse it. If the boar enters this state, it will be hard to tame and can only be eliminated.
Any breeder should be careful at all times in the boar area or when the boar catches the boar from one house to another, paying particular attention to the head of the boar. Boars can seriously injure people with their heads and mouths. When standing beside the boar, be sure to stand behind it so that it will not easily hurt people. When a person is standing in front of the boar for a certain distance, the boar can not hurt people. Also, don't be afraid when you raise and manage the boar, but be careful about its size and strength.
It is a good habit to train boars. Be sure to treat the boar gently and gently pat it every time. If it needs some help during work, it should do its best to help it. In the feeding and management of boars, try to communicate with them. Boars need to be treated correctly rather than abused. The correct treatment consists of tenderness and harshness, and gentle and harsh methods are suitable for different times and occasions.
Boar management and use technology
With the development of industrialization, intensification and large-scale pig production, artificial insemination technology has been widely used. In the process of artificial insemination, the management and use of breeding boars is the basic link, which is the premise to ensure the effect of artificial insemination. By extensively collecting data and based on their own practical experience, the author elaborates on the management and use of breeding boars for reference by peers.