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First, carry out economic hybrids. It can increase lamb's productivity. Hybrid male parents should choose individuals with large individuals, fast growth, and good meat performance; female parents should choose early maturing, high reproductive rate, strong maternal, and adapt to the local environment.
Second, the implementation of the same period estrus. It is conducive to fattening lambs and making full use of excellent rams, saving labor and facilitating management. All regions should determine the mating season according to the characteristics of climate and grassland. To promote the method of simultaneous estrous administration: (1) 150 to 300 mg of estrogen progesterone, 50 to 70 mg of progesterone, 80 to 100 mg of methotrexate, and 20 to 40 mg of fluroginone to prepare a suspension. With a new sponge dipped in liquid, stuffed into the ewes vagina deep 14 to 16 days. The day of removal, intramuscular injection of pregnant goat serum gonadotropin (PMSG, the same below) 400 to 750 units. After 2 to 3 days, most of the ewes estrus, artificial insemination once a day and the next day. (2) Mix the appropriate amount of the drug into the feed daily for 12 to 14 days, and intramuscularly inject PMSG 400 to 750 units on the last day.
Third, the lamb is weaned early. The traditional lamb weaning date (12-18 weeks old) is advanced to 6 weeks old. The use of feeds supplemented with whole grains as the main ingredient, and the use of the characteristics of the ruminant microflora of the lambs that have not yet been established and the feed conversion rate is high, the intensity of fattening is implemented.
Fourth, supplement biological active substances. Commonly used are: (1) Monensin. It can increase feed conversion rate and maintain weight gain rate while reducing feed intake. (2) meat growth hormone. Can stimulate the pancreas and adrenal glands, promote protein synthesis and lamb weight gain. Lambs can be implanted from 4 to 7 days of age, each of which is valid for 60 days and is to be planted 65 days before slaughter. Tests have shown that the weight gain rate after implanting cleaver can be increased by 10% to 24%, and (3) ammonia enzyme. The nursing lambs were injected with 5 mg of ammoniacal enzyme per kilogram of body weight every other day. After 15 weeks of age, the fat content in the muscles of the lambs was reduced by 15% compared with the non-injected ones, but the weight gain was not reduced. (4) Sodium bicarbonate. Adding 2% sodium bicarbonate can increase lamb weight gain.
Fifth, scientific feeding management. (1) Maintain a reasonable level of nutrition. Grazing Attention should be paid to the choice of pastures and green bushes where bushes are dense, ensuring adequate grazing time, and feeding concentrates according to different growth stages. Before 4 months of age, fast growth requires high protein concentrates. After 4 months of age, the accumulation of fat in the body is increased, and high-energy feeds should be added. The proportion of crude coarse material in the diet should be 20:80 or 25:75. (2) Strengthen comprehensive prevention and treatment of diseases. Timely vaccination, unified deworming, keeping the bar house warm, dry and ventilated, the bar house regularly disinfected.
The goat lamb is slaughtered in winter, which not only eases the contradiction between livestock and livestock in winter, but also accelerates the turnover of herds and funds. The cost is low and the benefits are fast. It fully exploits the characteristics of early growth and high feed reward of the lamb. Using the following techniques, the amount of slaughter in the current year will greatly increase.