With the rapid development of the dairy industry and the continuous warming of dairy cows, another problem encountered in the development of the dairy industry is the shortage of milk resources, and the large-scale investment of cows. It is necessary to change the concept of catching the dairy farmers who are trying to catch up with the development of the dairy industry and fully understand that dairy goats are also a good way out of poverty. The primary problem for the development of dairy goats is to abandon traditional backward farming and management methods, increase investment appropriately, and adopt the latest technology, so as to improve the comprehensive benefits of dairy goats. The techniques that should be promoted in goat breeding are summarized in the following aspects:
1. During the same period, the estrus technology of milk goats has a strong seasonal estrus. Most of them are concentrated in the fall from September to October, and are lambing in February-March in the following year. A manual method was adopted to break the regularity of estrus in milking goats in the seasons, making them estrus, ovulation, and abortion in non-matching seasons to achieve balanced annual lamb production and milk production, and also to facilitate scale management. The method is to take 150-300 mg of progesterone to make a suspension with water, then dip it with a sponge and stuff it deep into the vagina. After 14-16 days, they were injected with 500 units (8-10 ml) of maternal serum on the same day. They were injected every other day or every other day. After 3-4 days, the animals were in heat. Or use one dose of aphrodisiac, with a estrus rate of 93% over a small period of 72-48 hours after application, and 50% of dairy goats will be aborted during the off-season. Through such measures, the ewes can be lambs during the estrus season to solve the problem of unbalanced fresh milk supply throughout the year.
2, superovulation technology that uses follicle stimulating follicles to promote the development of mature, and then luteinizing hormone caused by ovulation, referred to as superovulation. In general, a sponge impregnated with 30 mg of methyl norethindrone is placed into the ewes vagina to induce estrus in the ewes. From the 11th day, 50 units of follicle stimulating hormone were administered intramuscularly for 3 consecutive days for a total of 150 units. On the 12th day, the sponge was removed and 50 units of luteinizing hormone were intravenously injected for 48 hours. At the same time, the first insemination was performed and the second insemination was performed the next day. Artificial insemination, the general use of cervical insemination.
3. Artificial insemination technology has been researching and improving artificial insemination and freezing technology in recent years. The method is: dilute 1:1-3 with lactose diluent (11% lactose 75 ml, egg yolk 20 ml, glycerin 5 ml), place in the refrigerator, cool down to equilibrium after 3 to 4 hours (3°C-5°C) ), then use a syringe to separate the semen into thin tubes or ampoules, put them in the refrigerator, and then place the semen in liquid nitrogen (about -80°C) to evaporate or put the semen after cooling and cooling - 80°C liquid nitrogen yarns are dripping into pellets on the net. The cryopreserved semen can be stored for a long period of time under ultra-low temperature conditions (-196°C) and used for thaw insemination. Usually, the dilute proportion of dairy goat semen varies depending on the type of diluent. Intracervical insemination in the middle to end of estrus and injection of 60 million to 75 million sperm can guarantee a higher conception.
4. Early weaning technology Laying lambs with milk replacer products can increase production and reproduction rates, shorten the period of idleness, and save 10%-15% of total milk. However, the time for feeding milk should be mastered, generally not earlier than 9 days of age. Before 8 days of age, let the lamb eat colostrum and eat colostrum. In the process of feeding milk, there must be a gradual replacement process to allow the lamb to adapt slowly, this process can not be less than 4 days. Formulations for milk replacers are generally: 70% dry skim milk, 15% animal fat, 13.5% wheat flour, 1.5% minerals, antibiotics and vitamins. When you feed, replace the milk replacer with water to make it consistency similar to fresh milk. On the ninth day after birth, the lamb began to reduce the amount of milk and supplement milk substitutes, stopped milking at 13 days, gave 1.5-2 liters of milk substitutes a day, and ensured sufficient concentrates, hay and drinking water, and stopped milk replacers at 40 days. Give 0.5 kg of fine material daily. Lamb feeding milk replacer can ensure normal development and increase weight quickly. The time for the lamb to officially feed the hay should be 6 weeks after birth.
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