Eight complementary measures to increase milk production

1. Shorten the interval between calving

Since the cow's gestation period is relatively stable at about 280 days, the length of the cow's calving interval is determined by the length of the postpartum period. Therefore, postpartum estrous and affection fertility can be regarded as two conditions that determine the length of the cow's calving interval. Shortening the calving interval not only increases the reproductive rate, but also increases milk production. After the cows have been delivered for a certain period of time, drug treatment, promotion of reproductive function recovery, shortening of postpartum estrus, timely mating after childbirth, early diagnosis of pregnancy after mating, and timely induction of estrus in empty cows are important measures to shorten the interval between calving.

2. Strengthen perinatal management

In view of the fact that the postpartum cow's appetite recovery is later than the peak of lactation, it is recommended that the perinatal cows be reared with the “guide method”. Pay attention to the adjustment of body condition, stabilize the supply of forage and feed, and avoid sudden replacement of feed, causing the cow to develop diarrhea due to its inability to adapt to high-energy feed. From the last 2 weeks of cow dry milk, until the peak of lactation after calving, the amount of fine concentrate is gradually increased in proportion to the amount of high-quality roughage daily.

3. Maintain moderate exercise

For intensively raised dairy cows, proper exercise can improve the body composition of the cow, promote the metabolism of the cow, and increase the vitality of the reproductive system such as the ovary. It is recommended to artificially drive twice a day for 20 minutes each time in the stadium to make it suitable for exercise. This will help prevent obstetric diseases and improve reproductive performance.

4. Obstetric disease treatment

(1) Intrauterine administration: For cows suffering from endometritis and a normal estrus cycle, treatment is performed by intrauterine administration. Experiments have shown that injecting drugs into the uterus during estrus is effective. For cows suffering from catarrhal endometritis, 1-2 capsules of Miyadukang can be directly injected into the uterus during estrus, and can be cured after 2 days; once for cows with pus-like vaginal fluids, Firstly, add 5 "Lutze" to the uterus with normal saline. After discharging the empyema, inject 1-2 doses of "Miyakang" into the uterus and receive good injections every 2 days. Treatment effect; For the more serious endometritis suffering from cattle, available saline 50-100 ml plus penicillin (800,000 units / branch) 2 and streptomycin (1 million units / branch) 3, mixed 1 times Injecting into the uterus, when the next episode of insemination, will receive a more satisfactory therapeutic effect.

(2) Intramuscular injection: After uterine injection, oxytocin or cloprostenol can be intramuscularly injected at the same time. This can increase the excitability of the uterus and strengthen the contraction of the uterine smooth muscle, which promotes drug absorption. At the same time, it helps to rapidly discharge uterine empyema and dirt to cleanse the uterus.

5. Strengthen postpartum care

After cows are delivered, the natural function of the uterus can be restored through the cow's endogenous hormones. However, the changes in the levels of estrogen and progesterone in the blood before delivery and the relative imbalance in the ratio will make the uterine smooth muscle less sensitive to oxytocin. The weakening of uterine muscle contraction leads to dystocia, thereby prolonging the recovery period of the uterus. Based on the above reasons, after 1 week of puerperal injection, 500 ml of physiological saline containing “exposed net” was injected into the uterus, and after perfusion, the uterus was gently massaged to expel the uterus with the flushing fluid and rinsed once every 3 days. . Inject oxytocin by intramuscular injection to enhance the contractility of uterine smooth muscle and accelerate the discharge of lochia. In order to avoid the occurrence of metritis, after the lochia is drained, it is injected into the uterus and then flushed with normal saline every 3-5 days to complete the purification. At this time, the uterus has basically recovered. In order to avoid the occurrence of persistent corpus luteum, it is recommended to intramuscularly inject two cloprostenol intramuscularly 18-21 days post partum to strengthen the uterus and ovaries and promote its estrus as soon as possible.

6. Drug-assisted fertilization

If the follicle has not ruptured and ovulated 12 hours after the sperm reaches the fallopian tube, the egg cannot be fertilized. In order to increase the fertilization rate of the egg, drugs can be used to promote ovulation, ensuring that the sperm and the egg meet in an effective time after insemination.

(1) After insemination, intramuscular injection of gonadotropin-releasing hormone can rapidly mature follicles and ovulate them, increasing the chance of egg fertilization.

(2) Intramuscular injection of human chorionic gonadotropin. The use of ovulation-promoting drugs can accelerate the ovulation of mature follicles to prevent the inadvertent occlusion of follicular development due to the deficiency of endogenous hormones.

(3) For bred cattle with recessive endometritis, 2 penicillin (800,000 units/piece) and 3 streptomycins (100,000 units) are added with a small amount of physiological saline 4 to 6 hours after insemination. / Branch) Inject into the uterus after mixing evenly to increase the conception rate.

(4) Sodium selenite vitamin E injection. Under normal circumstances, the mortality rate is highest when the bovine embryo develops to 5-12 days, which is directly related to the lack of selenium and vitamin E in the bovine body. Therefore, it is recommended that 30-50 ml of sodium selenite vitamin E injection be injected intramuscularly on the day of cow insemination in order to avoid early embryonic death of the pregnant cow and increase the conception rate.

7. Hormone induced estrus

Shortening the lassitude period is an important measure to ensure a proper interval between calving and increase the average annual fertility rate. In order to induce cows to heat in 60 days postpartum, it is recommended to use reproductive hormones to induce estrus. The gonadotropin-releasing hormone was injected within 30-40 days after the cow was born. After 1 week, the injection of chloroprostaglandin had a good therapeutic effect on postpartum complications due to ovarian static and other reasons.

8. Safety and health insemination

The use of a domestic disposable cannula-type insemination gun, each cow with a plastic casing, can prevent cross-infection of diseases such as metritis, vaginal Trichomonas, prevent healthy cattle from being infected.

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