How to improve the quality of boar semen in summer!

As the saying goes: “The sows are good and they have a good nest. The boars are good and they are good.” The quality of boar semen directly affects the number of sows born, which in turn can be used as an important basis for evaluating boar performance. The boar semen in summer has been greatly affected by heat stress! Today, the pig sister talks about nutrition, disease, management and environment. How to improve the quality of boar semen in summer!

After reading the last sentence, professionals will say, “Why don't boar breeds come to the platform?” Xiao Bian doesn’t want to explain that 99% of domestic boars are imported from abroad, nothing more than Duroc. , Changbai, Pietrain, Bachshire, etc., performance vary, the key lies in what kind of performance you want to get! Under heat stress, semen quality is affected by the situation, there is no significant difference.

First, strengthen boar management and management from 4 aspects to ensure the quality of semen!

Feed

For boars only, as to why special materials are used, we will not repeat them here. The word "nutrition" is used.

Two meals a day, as early as 8 o'clock in the evening and 4 o'clock in the summer, it is recommended to use wet-mix (2:1) feed to increase the intake and balance the nutritional level. After feeding for half an hour, the feed tank was cleaned to prevent spoilage. Keep the feed fresh.

2. Drinking water

Summer water temperature ≤ 30 °C, the water purifier water speed is not less than 2L/min. If the water temperature is too high, it will inevitably reduce the amount of water consumed by boars, which will lead to problems such as decreased feed intake and constipation.

3. Body condition

Avoid overweight and overweight, keep the weight at 150-200 kg, and limit the amount of adult boars to feed.

On a cool morning or evening, the boar is rushed to the sports ground for half an hour of exercise to ensure that the boar has plenty of energy, improves sexual desire, and enhances sperm motility.

4. Harvesting and breeding

The frequency of sperm extraction in adult boars is 2 times, no more than 3 times; reserve 1 time, must be adopted every week. Avoid overselling or excessive breeding!

Second, a comprehensive balance of nutrition equipment, escort for the quality of pig fine!

Green feed is fed with 1kg/head, too much will increase the abdominal circumference, affect the species, and properly expand the intestinal volume to prevent constipation.

Animal protein supplements, supplemented with 1-2 eggs daily, after harvesting or during heavy breeding tasks.

Functional products can be added to the feed, which is rich in L-carnitine, vitamin B1, B6, B12, C, tryptophan, niacin, pantothenic acid, aspartic acid, glycine, methionine, betaine, and the like.

Third, summer heatstroke cooling is the top priority, otherwise the above measures can be avoided.

1. Boars are under the condition of heat stress for a long time, and the decline in semen quality is the first to happen, while the appetite and libido decrease due to weight loss, and even death from heat stroke.

The optimum temperature of the boar is l8-20°C. The normal temperature of the testes is 2-3°C lower than the body temperature, and the testes are very sensitive to temperature.

When the room temperature is ≤ 26°C, the boar regulates the temperature by dilating the wrinkled part of the epidermis of the testicle scrotum. When the room temperature is higher than 28°C, the temperature in the deep part of the boar will exceed 40°C, which will cause the temperature of the testis to rise.

Sustained high temperatures can cause semen quality to deteriorate. At the same time high temperature can induce orchitis, resulting in permanent loss of testicular spermatogenesis. It takes 7 weeks from the formation to maturity of the spermatozoa, and the effect of heat stress requires 7 weeks to recover.

2. The tall canopy is planted around the boar and the vines such as pumpkins are used to cool the shade.

3 standing cooling equipment: fan, exhaust fan, wet curtain - fan, air conditioning, spray spray. Wet-blind-fan is the most widely used cooling method. It needs to be turned on before and after feeding and at high temperature (>26°C). It can usually reduce room temperature by 3-8°C.

4. Place a hygrometer in the barn at the same level as the male bar. Place a hygrometer near the boar. Below 26°C, only the fan is turned on, and the fan and wet curtain are opened when the temperature exceeds 26°C.

Backup generator. Since the summer season is a peak season for electricity use, frequent power cuts may occur. Therefore, a generator must be prepared for emergency use during power outages.

5. In the early morning and early evening, open windows, ventilation and ventilation. After 11:00 pm, the curtains were opened and the fan was turned off.

6. Environmental sanitation, after feeding, scrape the manure and punch the bar. The sperm extractor brushed and bathed the boar and was exposed every 4-5 days during the summer. This kind of contact with the comfort of the pig can create an atmosphere in which the human and the pig live in harmony and reduce the surface parasites.

Fourth, through vaccine nutrition and health nutrition, for the quality of the pig to prop up a powerful umbrella!

1. Vaccination, choose a cool early morning or evening in summer, reduce the impact of heat stress on vaccination, and ban vaccination on boars with poor mental status or illness.

2. Before and after the vaccination, pay attention to adding multidimensional drinking water to reduce the stress response. The side effects after vaccination, such as the general decline in feed intake, fever, allergies, etc., were recorded in detail to assess the safety of the vaccine.

3. Deworming, intramuscular injection method, 2 times a year; feed companion method, once every 3 months, to achieve the purpose of removing parasites from the body to reduce the parasite's harm to breeding boars.

Attached below are basic criteria for sperm motility

The total number of original spermatozoa reached more than 10 billion, the vigor of semen was 0.8 or more, the quality was as good as 0.9, and the malformed sperm was less than 15%, while the viable spermatozoa could hardly be seen in poor quality. At room temperature, the original spermatozoa have the same vitality, are diluted with the same diluent, and are stored under the same conditions (at a constant temperature of 15° C.) and can be stored for more than 2 days. Those who fail to meet the above requirements and cannot improve after taking the above-mentioned measures are recommended to be eliminated.

In summary, to ensure the boar libido and semen quality of boars in summer, the first place is to prevent the heat and cool down, combined with nutrition, disease, management and environmental measures to allow the boar to enjoy a pleasant high-temperature summer. Reminder: By adding a good semen diluent and incubator, the effective use time can be extended by 5-7 days, reducing the breeding task of breeding boar and reducing waste of pigs, thus saving boar costs and labor costs, and increasing The benefits of the farm!

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