Professional manufacturer of Mother&Baby Id Band,Medical Id Bracelets in China, Wholesale Medical Mother&Baby Id Band,Disposable Id Bracelets with low price, high quality. Disposable Mother&baby ID Band Mother&Baby Id Band,Medical Id Bracelets,Medical Mother&Baby Id Band,Disposable Id Bracelets Luck Medical Consumables Co.,LIMITED , https://www.luckmedical.com
One reason analysis
1, nutritional reasons. (1) In summer, the temperature is high, the sow's heat dissipation is difficult, the feed intake is reduced, the intake of nutrients required for sow breeding is insufficient, irregular estrus and ovulation occur, affecting breeding and conception, and stillbirth and weak birth. (2) The stability of vitamins in feeds during the high temperature season is poor, especially the fat-soluble vitamins A and E are more rapidly deactivated when the ambient temperature exceeds 30°C, while vitamins A and E are the most basic and important vitamins for maintaining normal breeding activities. Lack or deficiency of vitamins in feed is the basic cause of low conception rate and abnormal embryo development. (3) Lack or deficiency of green feed can cause constipation in male and female pigs, affecting feed intake and normal reproductive activities.
2, the ambient temperature. The viability of the boar semen is negatively correlated with the ambient temperature, and the higher the ambient temperature, the lower the vigor of the semen. In summer, the pighouse temperature is mostly 38-40°C, or even higher. Boar libido decreases, semen is thin, dead spermatozoa increase, and vitality decreases significantly. This is the most direct reason for the low fertility rate of sows in summer.
3, lack of exercise. Insufficient exercise can cause sow weakness in the sow, which directly affects the conception rate. Boar movement is too low and semen activity declines, directly affecting the conception rate.
4, the cause of the disease. The epidemic that causes the decline in the viability of male boar semen is mainly Japanese encephalitis in summer. The disease is mainly transmitted by mosquitoes and flies, and occurs frequently in summer. The boar mainly manifests as orchitis, sexual dysfunction, and reduced semen quality. Sows are The performance of breeding difficulties, miscarriage, stillbirth and so on. Therefore, Japanese encephalitis also directly affects the conception rate of sows.
5. Improper use of boars. In summer, the heat stress of boars is obvious. Some pig farms are mated during the day, causing more damage to the boars, which results in some boars not being used in the short term, thereby increasing the frequency of use of other boars. Boars are used too frequently. Semen quality will inevitably drop, and the conception rate will also be affected.
Two prevention methods
1, suitable to add green feed in summer. Each head breeder feeds 2-3 kilograms of green feed each day to supplement the deficiency of vitamins.
2, adjust the breeding pig diet. Raise the feed protein level of breeding stocks, control the feed protein of boars at 16%, control the feed protein of boars at 14.5%, and increase the supply of vitamins, especially fat-soluble vitamins A and E, in addition to the normal amount. One hundred kilograms of dietary supplements are best supplemented with 2-2.5 grams each of vitamins A and E.
3. Do a good job of preventing heatstroke and cooling. Breeding pigs should have ventilation cooling or spraying cooling equipment in the summer, adding 0.4%-0.6% baking soda in the feed can also play the role of sunstroke cooling.
4, rational use of breeding animals. The first is to control the frequency of breeding, breeding boars in the summer is not more than 5 times a week; second is to adjust the breeding time, the traditional summer early and late mating to adjust to late-night breeding (12 pm), practice has proved that late summer breeding in the same conditions Under circumstances, the conception rate can be significantly increased by 10%.
5, do a good job in breeding animals. In addition to routine immunization of breeding stocks, Japanese encephalitis vaccine injection should be done every year. Using sodium selenite vitamin E injection once a month can improve boar semen viability and breeding ability.
6, to strengthen the breeding stock movement. Sooner or later, each type of boar will be chased and driven for about 1 hour each time. Control the sow's lyrical condition and timely eliminate breeders with breeding defects and old breeders.
Prevention of low conception rate of sows in summer
In summer, the conception rate of sows often decreased significantly, the number of litters decreased, and the number of stillborn babies increased. The fertility rate was mostly around 70%, which seriously affected the economic benefits of raising pigs.