Targeted microecological preparations can be divided into three categories according to their use: environmental regulators for cultivation, microecological control agents for controlling pathogens, and feed additives for improving animal resistance and health promotion. Therefore, the actual production should be based on different needs to choose the right preparations to prevent common diseases of the animal is mainly used lactic acid bacteria, Pediococcus, Bifidobacterium and other lactic acid bacteria production will be better; to promote rapid growth of animals, improve feed efficiency can be The microecological preparations selected from Bacillus, Lactobacilli, Yeasts, and Molds are selected; if the main purpose is to improve the culture environment, they should be selected from the group consisting of photosynthetic bacteria, nitrifying bacteria, and Bacillus. In short, targeted use under the guidance of animal microecological theory can achieve the desired effect at the most economical cost. The probiotic effect of using doses of microecological agents is achieved through a series of physiological activities of beneficial microorganisms in animals. The final effect is closely related to the number of probiotics applied, and the number is not enough. Prebiotic effect. According to experiments, if the concentration of a bacterium in the cecal contents is less than 107/g, the enzymes and metabolites produced by the bacterium will not be sufficient to affect the host; if the amount is too large, it will exceed the need to occupy the intestine and form a dominant flora. The amount of bacteria will not only increase the effectiveness, but will cause unnecessary waste. There is no uniform requirement for the number of microflora used for certain cultured animals. German scholars believe that the microbiological agents in the feed should have a bacterial content of (0.2-0.5) 107/g feed. Adding 106 Bacillus per gram to the feed, E. coli in feces decreased by 35%, and 0.5 to 0.6 grams per day could have a therapeutic effect, while Lactobacillus was different due to different preparations, and its number was not less than 107/ g, 0.1 g to 3 g are applied daily, and the general addition amount is 0.02% to 0.2%. The use of time microecological preparations can be used throughout the animal's growth process, but its effect is not the same at different growth stages. Generally in animal larvae, the microecological balance in vivo is not yet fully established, and the ability to resist diseases is weak. At this time, probiotics can be introduced into the body and occupy the attachment points with the best effect. In addition, under the stress conditions such as weaning, transportation, feed conversion, weather mutation and poor feeding environment, the micro-ecological balance in animals is destroyed, and the use of microecological agents is extremely beneficial to the formation of dominant populations. Therefore, the timing of the application of probiotics should be grasped. Feeding as early as possible and long-term, so that its probiotic effect is fully reflected. Antibiotics combined with antibiotics have been used as the main means for disease prevention and treatment of farmed animals for many years because of their unique advantages in bactericidal effect and reproducibility. They have played an important role in preventing and treating common diseases and promoting the healthy growth of animals. Taking into account the shortcomings of microecological preparations in the treatment of sudden diseases, in the epidemic period of the animals, the more targeted antibiotics can be used first to kill or inhibit the reproduction of pathogenic microorganisms and control the spread of the disease. However, while the antibiotics are killing pathogenic bacteria, the normal flora of the animals is also destroyed. In this case, microecological preparations should be promptly introduced to restore the balance of disturbed intestinal flora through its unique beneficial effects. The so-called synergistic effect of microecological agents and antibiotics.
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