Sows breeding several technical points
1. The mating farm should choose a place that is far from the barn, quiet and flat, and the mating should be carried out before or after the feeding of the male and female pigs. When mating, sows are rushed to the mating point, and then rushed to the designated and equipped boars. After the boar crosses the sow, the sow's tail bar can be turned to one side so that the penis can be smoothly inserted into the vulva. . To prevent the penis from being inserted into the anus, determine if the boar ejaculates based on the fluctuations of the muscles near the anus of the boar.
Similar to the male and female pigs, the best physical size is similar. If the boar is smaller than the sow individual, the slope should be chosen for breeding to allow the boar to stand high; if the boar is larger than the sow individual, it can be used as a public boar. The pig stood low. If the boar is very large, it is necessary to prevent the sow from causing a fracture due to the boar crossing.
When the weather is bad, it is necessary to mate in the house. In summer, it is necessary to mate in the early morning and late evening. After the breeding, avoid bathing in the bath or lying in the wet place immediately.
2. Artificial insemination
Vigorously promoting artificial insemination techniques can not only improve the quality of herds, but also reduce labor and feed, and increase economic efficiency. Therefore, the use of artificial insemination should be the direction of the development of China's pig industry.
The freezing of pig semen has not yet achieved the desired results, but the preservation at room temperature has been quite successful. The length of time the pig semen is stored at room temperature is directly related to the quality of the diluent. Under normal circumstances, the pig semen is stored at room temperature for 3-4 days or even 7-8 days. The fertility rate is still high.
The advantages of artificial insemination:
1It can improve the utilization rate of the fine boars; 2 Reduce the number of boars to be reared; 3Can overcome the difficulties in the delivery of male and female pigs when their body size is disparity; 4 Avoid the spread of diseases; 5 Can solve the problems of multiple breeding. semen.
Semen dilution:
The purpose of dilution of semen, so that a boar's reproductive capacity than natural mating expand many times, and the conception rate does not fall. Within a certain range, the more sperm contained in each insemination, the better the effect.
3. Artificial insemination operation points
Before insemination, the operators wash their hands and rinse the sterilized insemination equipment (30-50 mL glass syringe and insemination hose) with a small amount of diluent. The temperature of the semen was raised to 35-38°C at a rate of 1°C per 2 minutes; the genital area of ​​the sow was disinfected with 0.1% potassium permanganate solution. Then open the female sow door with one hand, insert the vagina into the vagina with a dive tube, first advance about 10cm diagonally, and then advance about 30cm horizontally. When the hand feels no longer advancing, it means that the vas deferens has been inserted into the cervix and can be slowly injected Semen, such as the occurrence of semen countercurrent, can be suspended injection, activity after the vas deferens injection, until the end, and then slowly extract the insemination hose.
4. Master the appropriate infusion time
Since there is no boar effect with artificial insemination, it is not easy to accurately determine the start time of estrus in sows. In order to solve this problem, two insemination methods are generally used during the estrous period, and the time interval is 12-24 h. In addition, with different insemination rates, the sow's conception rate is also different.
In insemination, the vas deferens can be rotated and gently rocked, while pressing the buttocks or touching the udder by hand can increase the "joy" of the sow. Raising the hips is good for insemination. At the end of insemination, the buttocks of the sow should be tapped to cause the muscles of the whole body to contract, and the uterus also shrinks, preventing semen backflow.
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