Background of Research Background at Home and Abroad In recent years, with the adjustment of China's animal husbandry structure, the number of herds of herbivores, such as cattle and sheep, has increased rapidly. This is in line with China’s limited number of people and a limited amount of refined feed. In China's vast agricultural areas, low-quality roughage feeds such as low-quality feedstuffs for cattle and sheep concentrates provide the main source of nutrients for cattle and sheep growth. The problem of malnutrition is very serious, and the lack of minerals is even more prominent. Even on larger dairy farms, feed formulation is not very scientific and generally only considers nutritional needs such as energy, protein, calcium, phosphorus, and salt. In the grassland pastures, which lasted for 7-8 months, the lack of nutrition of cattle and sheep is very common. Therefore, the nutrients lacking in cattle and sheep are supplemented by feeding compound sheep and sheep. (such as digestible nitrogen, sugar, trace elements, sulfur, etc.), is one of the most effective nutritional supplements. The cattle and sheep compound nutrients block has been applied in the past few decades in the developed countries such as Europe and the United States, and is continuously improving and developing. According to inspections, the United States, Canada, Australia and other countries have developed a series of products from a simple Molasses-Urea Block to a series of products suitable for different cattle and sheep breeds, different uses and different feeding patterns. The production process of the block block has also evolved from a simple processing technology to a dedicated computer-controlled production line. The use of lick blocks has become a necessary measure in the cattle and sheep breeding industry in western developed countries of animal husbandry. Since the 1980s, with the help of the Food and Agriculture Organization of the United Nations (FAO), countries such as Asia and Africa have also started to research and promote the use of molasses-urea stilbenes as a cheap supplementary feed for ruminants and have achieved good results. In Pakistan, trials have shown that after the growth of yak and buffaloes that used wheat straw as roughage, the intake of straw increased by 23 and 30%, respectively. In another cow-producing experiment, the day-dairy milk output of the dairy cow increased by 1.6 kg when it was plucked on a 450-gram loquat block. A study in Indonesia showed that feeding sheep and beef cattle with urea molasses supplemented with nutrients increased daily weight gain by 126% and 103% respectively. In China, the research on the production and application of cattle and sheep lice began in the late 1980s. Zhejiang Agricultural University, Gansu Feed Research Institute, Guangxi Buffalo Research Institute and other units have conducted a lot of research on cattle and sheep. The experimental results of Zhejiang Agricultural University Liu Jianxin et al. (1994) showed that when cattle and goats were used to feed local cattle and goats, their daily gains increased by 0.167 kg (0.370 vs. 0.203 kg) and 22 g (95 vs. 73 g), respectively. Pure income increased by 0.58 yuan and 0.08 yuan respectively. According to the study of Chen Yuzhi et al. (1992) of the Institute of Forage and Feed Research of Gansu Province, the use of quail blocks to grow growing fattened cattle can increase daily weight gain by 0.112kg (0.835 versus 0.723kg), an increase rate of 15.5%, and the average daily increase in net income is 0.85. yuan. The results of beef cattle experiments conducted by Beijing Agricultural University Zhang Zhiwen and Zhang Xiaoming (1993) showed that the daily gain of beef cattle using compound nutrient blocks increased by 0.140 kg (1.036 versus 0.896 kg), an increase rate of 15.6%, and the average daily head increased by 0.483 yuan. Jiangsu Agricultural College Wang Xinglong et al. (1995) demonstrated that feeding lactating cattle with compound nutrient blocks increased daily milk production by 1.06-1.46kg, and the average daily net income increased by 1.0 yuan. Although all the test results at home and abroad have consistently proved that the use of cattle and sheep lumps can significantly increase milk production, beef cattle, mutton sheep daily gains and economic benefits of cattle and sheep breeding, but the product has not been in China's cattle and sheep breeding industry Medium-sized area is popularized and applied. The main reason is that, in addition to the lack of promotion by the relevant state departments and the problem of farmers and herdsmen, the main reason is that the past block production has not been able to achieve industrialization, and the block quality is not ideal, such as cracking, moisture absorption, expansion, Soft texture and so on. Therefore, research on the production technology of cattle and sheep compound nutrient block feed is very important. 2 The technical route adopted will be based on the market and technical investigations, and will determine the technical route for the use of domestically shaped machinery equipment with a small number of necessary research and development equipment for rational assembly into industrial production lines, simultaneous product formulation design and small amount of feeding trials, and then product promotion. . The adoption of such a technical route is based on the following considerations: (1) The cost of foreign block devices is expensive, and Chinese-made equipment should be preferred for block-type low-profit or low-profit feed products; (2) Foreign block press equipment is made of large scale Enterprises designing and manufacturing, we design a new product by ourselves and face many difficulties in technology; (3) It takes a long time and high cost for self-designed block equipment; (4) Similar equipment in the country, although the specificity Poor, but the price is not high; (5) through a serious selection of equipment, a reasonable combination of various equipment, and then a small amount of small necessary equipment can be developed into a production line. Adopting this technical route not only guarantees the quality of equipment and products, but also has a short development time and low cost.
Dental Products
Dental Products,Dental Chair,Ultrasonice Bath,Dental X-Ray Product
Ningbo Cland Medical Instruments Co., Ltd. , http://www.cland-med.com