In animal husbandry production, livestock products that comply with the green food standards are collectively referred to as green livestock products. They include meat, eggs, milk and their processed products. Green livestock and poultry products can be divided into 3 categories: Category 1 is livestock and poultry products produced without any pollution; Category 2 is livestock and poultry products produced under natural conditions by the addition of biopharmaceuticals that are harmless to humans. The third category is livestock and poultry products that comply with the requirements of green foods produced during the production process by adding non-human drugs and additives with strong effects, rapid metabolism, low toxic and side effects, and low residual amounts. According to the requirements for the production of green livestock and poultry products, there are mainly three methods for producing green livestock and poultry products. 1. Natural stocking method In livestock and poultry products that are free from industrial waste and pesticide pollution, or where air, soil, water, and other environmental indices are within the target area and are produced by natural stocking. This kind of production method has low output, small scale, long cycle and high product quality, but it can not meet the market's large demand for products. 2. Biological methods In areas where the environmental index meets standards or livestock and poultry farms, select appropriate breeds, adopt green feeds throughout the breeding process, and use biological agents as additives to promote growth and prevent and cure diseases. Production with this method is characterized by high yield, short cycle time, good product quality, and large or small scale. The disadvantage is that the professional quality of the breeder is required to be high, and the preservation of the medicine has certain requirements. 3, withdrawal drug production method This method is suitable for small farms and individual breeders, the production conditions are not very strict requirements, the production cycle is divided into two stages, the first stage of feeding according to conventional methods, the second stage is the holiday period . During the drug holiday period, no pollution, no residue or pollution-free feed from green food production sites was used. The length of drug withdrawal period depends on whether the residues of harmful substances in various drugs and additives meet the requirements of green foods.
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