Preface

China is a large agricultural country. In the total agricultural output value, the percentage of animal husbandry has been more than 30. China's total meat production has accounted for 26% of the world's total meat production, and the per capita occupied meat and egg production are both higher than the world average. China has become a big animal husbandry country in the world. Animal husbandry has not only made an important contribution to improving and enriching the material life of our people, but also become an important source of national economic income. It also provides important raw materials for light industry, pharmaceutical industry and foreign trade export. Animal husbandry plays a very important role in the national economy.

      With the steady development of animal husbandry in China for 50 years, especially since the implementation of the reform and opening-up policy, the overall level of animal husbandry has been greatly improved. It has developed from the traditional extensive rural sideline to a pillar industry of the rural economy and even the national economy. Modern biotechnology, ecology, systematics, computer and engineering technology have penetrated into each other. Various new technologies of natural science have been widely used in modern animal husbandry, and many new achievements of social science are also being used in decision-making, management and management process by modern animal husbandry enterprises. With the development of animal husbandry industrialization, especially the improvement of people's living standard and the enhancement of environmental protection awareness, the sustainable development strategy is increasingly concerned by people. The state vigorously promotes the adjustment of agricultural industrial structure, changes the dual planting structure to the ternary planting structure, makes rational use of plant resources, changes grass to meat and grass to milk, gradually changes the production structure of food consuming animals such as pigs and birds in China's animal husbandry, and vigorously develops the production of food-saving herbivorous livestock. The animal husbandry shows an unprecedented good development trend. However, at present, the overall production level of animal husbandry in China is relatively low compared with the developed countries in the world, especially the industrialization and socialization of animal husbandry are not developed enough, the scientific and technological content of animal husbandry is not high, the deep processing of animal products is still in the primary stage, and the spear shield of the development of animal husbandry and environmental protection is gradually emerging. In a country, without the high development of animal husbandry, agricultural modernization is impossible. Nowadays, the output value of animal husbandry in developed countries accounts for more than 50% of the total output value of agriculture, and the potential of modernization and development of animal husbandry is huge. With the continuous improvement of people's living standards, animal husbandry will become a new growth point of China's modernization, and China will gradually develop from a big animal husbandry country in the world to a powerful animal husbandry country.

前言

我国是农业大国，在农业总产值中，畜牧业占有的比重已超过30%。我国肉类总产量已占世界肉类总产量的26%，人均占有的肉量和禽蛋量均超过世界平均水平。我国已成为世界畜牧业大国。畜牧业不但为提高与丰富我国人民的物质生活做出了重要贡献，成为国民经济收入的重要来源，而且为轻工业、医药工业、外贸出口提供了重要的原料，畜牧业在国民经济中占有非常重要的地位。

我国畜牧业50年的稳步发展，特别是国家推行改革开放政策以来，畜牧生产的整体水平有了很大提高，已由过去传统粗放型的农村副业，发展成为农村经济乃至国民经济的一个支柱产业。现代生物技术、生态学、系统学、计算机和工程技术等纷纷渗透交叉，各种自然科学新技术被广泛应用于当代畜牧业，许多社会科学新成果也正被现代畜牧企业应用于决策、管理和经营过程。随着畜牧产业化进程的发展，特别是人民生活水平的提高与环境保护意识的增强，可持续发展战略正日益为人们所关注。国家大力推进农业产业结构调整，改二元种植结构为三元种植结构，合理利用植物资源，变草为肉、变草为乳，逐步改变我国畜牧业中以猪、禽等耗粮型动物为主的生产结构，大力发展节粮型草食家畜生产，畜牧业呈现出前所未有的良好发展态势。但目前我国畜牧业整体生产水平与世界发达国家相比较低，特别是畜牧业产业化与社会化发展不够，养殖业的科技含量还不高，畜产品的深加工尚处于初级阶段，畜牧生产的发展与环境保护的矛盾正逐步显现出来。一个国家，没有畜牧业的高度发展，农业现代化就无从谈起。当今发达国家的畜牧业产值占农业总产值的比重一般都在50%以上，畜牧业现代化建设与发展的潜力巨大。随着人民生活水平的不断提高，畜牧产业必将成为我国现代化建设的一个新的生长点，我国也将由世界畜牧业大国逐步发展成为畜牧业强国。

本书的主要特点是实用准确，先进全面。为适应广大基层工作者的需要，编著者以通俗易懂的方式，严谨的语言风格，以常见病、多发病为主，按疾病分类，分别编写处方，体现了其实用性。本书中的药物处方主要依据国家和国际相关标准编写，有些相关标准中没有的处方，也因疗效安全可靠而收入，体现了其准确性。诚然，畜禽疾病的发生发展错综复杂，千变万化，由于篇幅所限，本书也难以面面俱到。