Compound premix for pigs is an intermediate product made of a variety of feed additives according to a certain proportion, which aims to let users prepare full price feed by themselves. The standard of general terms for feed industry issued by China's Technical Supervision Bureau defines feed additives as follows: "a small amount or trace of nutritive or non nutritive substances added to feed to meet the special needs of livestock and poultry (such as improving feed utilization rate, ensuring or improving feed quality, promoting animal production and ensuring animal health).

一、饲料添加剂分类

1、 Classification of feed additives

饲料添加剂的分类众说纷纭，不同学者提出不同分类方法，而笔者根据多年的基层实践，认为饲料添加剂分为以下三类更易为基层工作者所接受。

There are different opinions on the classification of feed additives, and different scholars put forward different classification methods. Based on years of grass-roots practice, the author thinks that feed additives can be divided into the following three categories, which are more easily accepted by grass-roots workers.

1、 营养性饲料添加剂

1. Nutritive feed additive

主要有氨基酸添加剂、维生素添加剂、矿物质添加剂等。这类添加剂的用途是补充基础日粮营养成分之不足，以使日粮达到营养成分平衡即全价性。

There are mainly amino acid additives, vitamin additives, mineral additives and so on. The purpose of this kind of additive is to supplement the deficiency of the basic diet nutrients, so as to make the diet reach the nutritional balance, that is, the total price.

2、 药物饲料添加剂

2. Pharmaceutical feed additive

主要有抗生素添加剂、激素类添加剂、驱虫剂、促长剂、生菌剂、中草药添加剂等。国内禁止使用激素类、剂类等用作饲料添加剂，绝不允许使用以提高肉猪瘦肉率为目的的β—兴奋剂类。这类饲料添加剂的功效，主要在于增强机体免疫力，促进生长，提高经济效益。欧盟对抗生素的使用有严格的规定，我国也禁止滥用，须严格按《饲料和饲料添加剂管理条例》执行。

There are mainly antibiotic additives, hormone additives, anthelmintic agents, antibacterial growth promoting agents, microbial agents, Chinese herbal medicine additives and so on. It is forbidden to use hormones and tranquilizers as feed additives in China, and β - stimulants with the purpose of increasing lean meat rate of pigs are not allowed. The effect of this kind of feed additive is mainly to enhance immunity, promote growth and improve economic efficiency. There are strict regulations on the use of antibiotics in EU, and abuse of antibiotics is prohibited in China, which should be carried out in strict accordance with the regulations on Administration of feed and feed additives.

3、 改善饲料质量添加剂

3. Additives for improving feed quality

主要有抗氧化剂、脂肪抑制剂、防霉剂、调味剂等。

There are mainly antioxidants, fat inhibitors, mildew inhibitors, seasoning agents and so on.

给猪供给全价饲料旨在提高畜禽饲料转化率，这是广大饲养者的愿望和要求。在能量和蛋白质基本得到满足的条件下，使用适量氨基酸、维生素、微量元素等添加剂即可完善配合饲料全价性，从而达到降低饲料消耗，提高生产水平和经济效益的目的。

The purpose of supplying pigs with full price feed is to improve the feed conversion rate of livestock and poultry, which is the desire and requirement of the majority of breeders. Under the condition that energy and protein are basically satisfied, the full price of compound feed can be improved by using proper amount of additives such as amino acids, vitamins and trace elements, so as to reduce feed consumption, improve production level and economic benefits.