What are the key technologies to improve mutton production?

(1) for the first generation of crossbreeding, the small-tailed Han sheep was used as ewe, and the improved meat variety was introduced as ram to produce fat lamb, which not only utilized the heterosis, improved the meat production performance, but also retained the excellent characteristics of the small-tailed Han sheep. (2) During the second trimester of pregnancy, the fetal weight of ewe increased by 80%. Feeding ewes at this time can make up for the lack of nutrition and ensure the normal development of the fetus. After feeding ewes in the third trimester of pregnancy, the birth weight and weaning weight of lambs are higher, and the ewes have enough milk after delivery, and the lambs develop healthily. (3) The lamb gained the fastest weight within 2 months, and its food was mainly milk. So make sure that lambs get enough breast milk. After the lamb was 3 months old, the milk yield of ewes began to drop sharply, while the feed intake of lambs increased day by day, so the supplementary feeding of lambs should be strengthened. At first, the lambs were fed with high-quality forage, so that the forestomach was exercised and gradually developed, and the feed intake gradually increased, which was beneficial to the growth and development of lambs. At present, in sheep production, early feeding of lambs is advocated, and training to eat forage is generally started from 14 days old. Green hay can be supplied in unlimited quantities, and the amount of concentrate should be flexibly controlled according to the quality of forage and the milk yield of ewes. (4) The weaning age of timely weaned lambs should be determined according to the development of lambs and the reproductive characteristics of ewes. Lambs can be weaned early if they are well developed or ewes give birth 1 year. If the lamb is stunted, the lactation time should be appropriately extended. Generally, it is more appropriate to wean lambs 60 ~ 90 days after birth when their weight is above 15 kg. At this time, lambs can make full use of forage. (5) Lambs slaughtered at the right time have certain regularity in growth, rapid growth in the early stage and high feed conversion rate; In the later stage, the growth was slow, and the feed conversion rate decreased. Therefore, after fattening for a certain period of time, it should be slaughtered in time to obtain the best fattening benefit. (6) Control internal and external parasites, and adopt the drug control method of internal drive and external bath to effectively control the parasites that endanger the normal growth and development of sheep. Parasites can reduce the growth rate of lambs 15% ~ 30%, and even kill some sheep in poor health. The control of internal and external parasites is an important measure to ensure the production of fat lambs. (7) Choosing suitable growth promoter, using the trace element additive "Fattening tycoon" produced by Yangling Fulekang premix feed factory to fatten small-tailed Han sheep lambs, the effect is very good. According to our experiment, the daily gain of lambs fed with 1% "Fattening Tycoon" is 42% higher than that of lambs fed without it.