In the past, China's mutton production mainly relied on the elimination of laggard lambs and old-age mutton sheep. The operating methods were backward and the production level was low. Although the number of raised sheep has increased year by year, mutton still falls far short of the needs of domestic and foreign markets. Using the world-famous beef Boer Goat as male parent, and using goats, meat goats or other goats of other uses throughout the country as a female parent, the hybrid lambs are rapidly fattening. It is an effective way to achieve high-quality, high-yield and high-efficient production of mutton sheep. First, the advantages of lamb fattening In the production of lamb, people are accustomed to the fattening lamb is called fat lamb production or lamb production. Fat lamb production has the following advantages: 1. Short production cycle, fast growth, high feed remuneration, and easy organization of specialized and intensive production. 2. The lamb meat is fresh and juicy, with more lean meat, less fat, light taste, delicious taste, and easy digestion and absorption, which is much favored by consumers. Lambs slaughtered between 3.5 and 7 months of age can be stripped of high quality and high quality skins. 4. The slaughter and utilization of lambs in the current year can increase the shedding rate, the meat production rate and the commodity rate of the sheep, and can also reduce the pressure of lack of forage during winter and spring, and can also avoid the occurrence of the dropping phenomenon in winter and spring. Second, the conditions of lamb fattening 1. Full use of heterosis, choose Boer goats and their high-generation hybrids as a male parent, select early mating, multiple births, prolific local breed goats as a female parent for hybridization, produced by a hybrid generation of weaning lambs Fat lamb production. 2. As far as possible, the ewes produce spring lambs or winter lambs so as to prolong the growth period of the lambs before they enter the winter and increase the body weight of the lambs. 3. Strengthen the feeding and management of ewes and lambs during lactation to enhance the constitution of the lambs. In addition to allowing the lambs to eat enough colostrum and regular milk, supplements should be provided as soon as possible in order to implement 3 months old weaning on time and lay the foundation for later fattening. basis. Third, the rapid fattening measures generally choose Boer goat hybrid generation 3 months old weaning lambs, fast feeding fattening, 50-60 days can be listed, slaughtered. The whole fattening period can be divided into two stages, one is the pre-fattening period (pre-feeding period), and the other is the fattening period (feeding period). (I) Pre-fattening The pre-finishing period refers to an adaptive transition period after weaning lambs enter the finishing cycle. It is also called pre-feeding period, which is generally about 10 days. 1. After the lamb enters the fattening circle, he must first undergo a health check, and the person who is not sick can do the fattening. The lambs were then grouped by sex, age, and size, grouped, and dewormed, medicinal baths, immunizations, hoof repair, and weighing. 2. In order to promote the digestive function of lambs and make them adapt to the fast fattening methods as soon as possible, it is advisable to feed sheep with a relatively high proportion of roughage in the pre-feeding period. The typical formula is: corn 25%, hay 64%, molasses 5%, rapeseed cake 5%, salt 1%, plus chlortetracycline 20mg/kg. This formula contains 12.9% of crude protein, 0.78% of calcium, 0.24% of phosphorus, and a crude/crude ratio of 36:64. Pre-feeding should use the same proportion of roughage diet. The typical formula is: corn 39%, hay 50%, molasses 5%, rapeseed cake 5%, salt 1%, plus oxytetracycline 50rog/kg. The formula contains 12.2% of crude protein, 0.62% of calcium, 0.26% of phosphorus, and a ratio of 50:50 for crude oil. 3. Concentrates should be fed 3 times a day, and each meal should be eaten in about 45 minutes. Increasing the amount of concentrate or changing the feed formulation should have an adaptation period of at least 3 days. (B) Fertilizer feeding period after the end of the pre-feeding period is transferred to fattening period, which is the feeding period, usually about 50 days. 1. High-nutrition diets are given to bred or older lambs for short-term strength fattening. The recommended diet formula is: corn 58%, hay 40%, bean cake 2%, plus chlortetracycline 25mg/kg. The formula contains 11.4% crude protein, 0.46% calcium, 0.26% phosphorus, and a crude/crude ratio of 60:40. 2. For physique or young lambs, the nutrient diet can be fed with a moderate amount of fattening for a period of time to allow it to grow older before it is transferred to a high-nutrition short-term strength diet. The recommended diet formula is: corn 53%, hay 47%, plus chlortetracycline 20mg/k so the formula contains protein 11.3%, calcium 0.63%, ash 0.25%, crude-to-coarse ratio 53:47. 3. Conditionally mix the roughage as much as possible into pellets with a diameter of 1-2cm. And establish a normal living system, regularly feeding sheep, drinking water, drinking water to supply adequate, good water quality, winter and spring season, the water temperature generally can not be less than 20 °C, and maintain clean and hygienic. Fourth, the rational use of additives in lamb fattening production, the rational use of additives, can play a multiplier effect. Common additives are the following: 1. Monensin sodium. Also known as rumen. Its role is to control and increase the efficiency of rumen fermentation to increase the rate of weight gain and feed conversion. Usage and dosage: Add 25-30mg monensin sodium per kilogram diet, the initial amount can be lower, then gradually increase to the required amount. When used, it must be uniformly mixed in the feed. 2. Bacitracin zinc. It can promote digestion and absorption of nutrients, improve feed utilization, and speed up daily gains. Usage and dosage: Add 10-20mg supplements per kilogram of mixed concentrate. 3. Urea phosphate. Is a new non-protein nitrogen feed additive, its hydrolysis rate in the rumen is significantly lower than urea, can promote the physiological metabolism of sheep and its absorption of nitrogen, phosphorus and calcium. Usage and dosage: Add about l0g of urea phosphate per day per sheep, the average daily weight gain can be increased by 28.5%. 4. Cow and sheep Wang. The Northwestern Agriculture and Forestry University is a premix plant developed and produced specifically for cattle and sheep fattening premix additives. It can speed up decomposition of forage, increase rumen function, promote the conversion and absorption of roughage, alleviate the contradiction between improper coarse and coarse materials, strengthen the content of trace nutrients, achieve fast and long meat, and promote short-term fattening. Usage and dosage: Add lambs of 50g per day to lambs over 3 months of age. China Agricultural Network Editor
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