Boar factors and countermeasures
The selection and adjustment of boars
Should choose to leave no genetic defects, strong limbs, disease-free, strong sexual desire, no masturbation boar boar Jingjing. The reserve boar starts to adjust after 7-8 months of age. When adjusting, boar semen or sow urine can be applied to the dummy boar to lure the boar. The boar can be taught 1-2 times a day, each time not exceeding 15 minutes. Can be trained once, no less than 3 times a week.
Strengthen the daily feeding and management of boars to provide boar quality protein and various vitamins, minerals, feed and limited feeding; bar floors should pay attention to anti-skid, insulation, easy to exercise; ambient temperature and humidity suitable, well-ventilated, relatively quiet; Keep the body condition of the boar moderate, body surface hygiene, strong sexual desire, and a large amount of sperm.
Boar campaigns are enhanced. Boars are exercised for 2 hours each day, 1 hour in the morning and 1 hour in the afternoon. Regularly check the quality of boar semen.
To achieve scientific management of semen collection, fixed picking time, picking location, picking personnel, frequency of picking and fine collection methods. Suitable frequency of boar semen: Old boars and young boars younger than 15 months old are harvested twice a week, and young boars older than 15 months are sewed once every two days.
Sows factors and countermeasures
Maintaining a sow's body condition is too fat or too thin due to sow feeding or other reasons. The estrus performance is not obvious. Even if the estrus lost sperm, it is easy to return, or because of the lack of partial nutrients in the sow diet, it is easy. Causes early embryonic death, resulting in sows returning or having fewer childbirths. Therefore, attention should be paid to the adjustment of the sow's diet and body condition before mating: The first is to feed more quality green feed. The second is that the sow house should have a sports field to enhance exercise and enhance physical fitness. The third is to give different full-price compound feeds according to the different growth stages of sows.
Maintaining sow health If the sow suffers from swine fever, pseudorabies, and blue ear disease, it is easy to return to the situation after insemination, even if it is conceived, it can easily cause early embryonic death and result in fewer sows; if the sow suffers Metritis, no matter how insemination will not be fetus. Therefore, sow disease prevention and control should be done. The first is to do regular preventive injections, especially the prevention of blue-ear disease, swine fever, pseudorabies, and parvovirus diseases. The second is to disinfect regularly and remove the parasites regularly. The third is to do a good job in preventing heatstroke and cooling and keeping warm. The fourth is the diagnosis and treatment of reproductive diseases.
Semen collection and treatment of semen is improper and countermeasures
Use modern mining tools and techniques
In order to ensure the quality of boar semen, it is required to use a dummy sow table with adjustable height, which is convenient for cleaning and disinfection, and disposable sterile gloves, special semen filter papers and sterile collection and finishing bags. There are two general methods of sperm collection, namely the pseudo-vagina semen method and the free-hand picking method. However, the most commonly used method is hand picking. The specific approach: Bring the boar to the sperm collection room, let it be sniffed, arch the fake sow table, and the staff touch the boar's genitals and abdomen with their hands to stimulate their libido, when the boar climbs onto the false sow table and When the mating action is done, he pulls out his penis and pays attention to the rhythm of the penis as if he is milking cows. The strength of the penis should be moderate to prevent it from slipping. When the boar ejaculates, the thinner, finer parts of the front should be discarded. When shooting a milky white liquid, collect it with a harvesting cup. Throughout the process, the boar will shoot more or less dilute spermatozoa again. Such semen should be discarded, and the thinner parts and colloids that are finally ejected should also be discarded.
Scientific treatment of semen
Strictly check semen quality: Semen quality inspection includes color, odor, pH value, vitality, shape, density and so on. The pig's normal semen is milky white or off-white, odorless or slightly stench, pH is 7.0-7.5, activity is above 0.7, malformation rate is less than 15%, and spermatozoa contain more than 200 million sperm per milliliter.
Proper dilution and dispensing of semen: The temperature difference between the diluent and semen must not exceed 1Â°C. When diluting, dilute the solution slowly along the wall of the measuring cup containing the semen, and continue stirring slowly with a glass rod to promote even mixing. It is not possible to pour the dilution directly into the semen as the sperm needs an adaptation process. Semen is divided into bottles and bags. The scales are generally on the bottle, the maximum scale is 100 ml, and the bag is generally 80 ml. After segregating the semen, stick the labels one by one. Pay attention to the number of the boar, the timing of sperm collection, and the density after dilution.
Correct preservation and transportation of semen: Boar semen has the best preservation effect at constant temperature. The appropriate temperature for preservation is 16Â°C-17Â°C. The preservation time should not exceed 3 days. The longer the semen is kept, the lower the conception rate for sows to inseminate. When transporting semen, use double-layer foam insulation box to keep warm. In summer, put ice cubes in the incubator. In winter, put thermostatic latex or cotton in the insulation to keep the temperature inside the incubator at 16Â°C-17Â°C, and avoid light at the same time. Directly, to prevent violent oscillations and collisions.
Improper sperm delivery methods and countermeasures
Accurately identify estrus
The estrus cycle of adult sows is 21 days, and each estrus lasts 40-70 hours. Estrus performance: uneasy, sometimes screaming, pussy red, loss of appetite, vaginal secretions, a large number of dilute secretions, mutual cross-climbing, frequent urination; then turned into a quiet, do not call it when slapped, hands touch the back when standing still, That is, "stand-up response" indicates that the sow had estrus to an orgasm, and the pus is swollen and regressed, and the color is dark purple. This is the best insemination time.
Before preparation for insemination before insemination, if the genitalia of the sow is not cleaned and disinfected, the bacteria or virus can easily be brought into the vagina or uterus of the sow through the vas deferens, causing diseases such as sow uteritis and affecting the effect of artificial insemination. . Therefore, the vulva of the sow should be cleaned before every insemination, and then wiped with a towel soaked in the disinfectant and dried.
Check the semen again before insemination because of the temperature of the thinner or the constant temperature refrigerator. Sometimes the quality of the semen that has been preserved will be significantly reduced. Therefore, the semen should be checked again before insemination, and unqualified semen cannot be used.
The timing of ovulation in the timely inseminated sows is 25.5 to 36.5 hours after the start of the climb, and sows should be inseminated between 8 and 10 hours prior to sow ovulation, that is, 15-25 hours after allowing the boar to climb. However, the ovulation time of sows varies depending on the species and age. In general, the primiparous sows are allocated earlier and the sows are allocated later.
When inserting the vas deferens with the correct insemination method, avoid inserting the urethra. Rotate the plug about 45 degrees diagonally upwards. Do not insert it hard so as not to damage the vagina of the sow. Apply lubricant to the head of the vas deferens for easy insertion. According to the sow's body length, generally insert about 30 centimeters to reach the mouth of the cervix, back to pull with a certain resistance can be insemination. When inseminating, sows must be stroking the vulva or lower abdomen to enhance the sow's excitability and improve the effect of artificial insemination.
Master insemination time and number of insemination
The time of insemination is closely related to the conception rate and number of births. Sometimes, in order to hurry, the breeding staff lost 2-3 minutes to a sow, and did not pay attention to the phenomenon of backflow. As a result, the number of returnees was low and the number of births was small. When sows are inseminated, the insemination time should be controlled at more than 5 minutes, but not too long so as not to affect the normal work. Generally insemination once every 8-12 hours after the first insemination, that is, the second insemination.
Pay attention to the sow's posture after the insemination. If the sow who has finished translucent semen is lying down immediately, the semen can easily fall back and affect the effect of artificial insemination. Therefore, once you have finished your infusion, beat your sow's butt and allow it to move to prevent semen backflow.
Measure the success of artificial insemination
The male to female ratio is the number of sows that can be allocated to a boar. In the case of natural mating, 1 boar with 25-30 sows, and the successful level of artificial insemination is a boar with 100-150 sows, the ratio of the male to female ratio should be more than 1:100 .
The male to female ratio is the number of sows that can be allocated to a boar. In the case of natural mating, 1 boar with 25-30 sows, and the successful level of artificial insemination is a boar with 100-150 sows, the ratio of the male to female ratio should be more than 1:100 . If the level is good, one boar should be equipped with 150-250 sows, one should be a good boar with 250-350 sows, particularly good units, one boar should be with more than 350 sows .
The conception rate of pregnancy rate and delivery rate should reach 85%, and the delivery rate should reach 80%; the good pregnancy rate should be 87%, and the delivery rate should be 83%; the excellent rate should be 90% and the delivery rate should be 86%. The best results are 95%-97% of conception rates and 89%-90% of childbirth rates.
The qualified scores for the number of litter-born animals are the total number of litter-bearing animals and the number of live-animals that are equivalent to natural mating. Good results are 0.05-0.09 higher than natural mating, and slightly better results are 0.1-0.5 higher than natural mating. Excellent results are 0.5-1 higher than natural mating, and particularly excellent is more than 1 higher than the natural mating average.
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