Antibiotic feed: Penicillin, streptomycin, chlortetracycline and oxytetracycline are mainly used in livestock and poultry breeding. Feeding piglets, calves, or chickens with chlortetracycline or oxytetracycline can increase weight by 10% to 15%; feeding adult chickens can increase hen health and egg production. Feeding piglets with chlortetracycline and oxytetracycline, with a weight gain of 12% to 40%.
Nitrogen-fixing bacteria feed: According to the test, the nitrogen-fixing bacteria are inoculated in roughage or mixed feed and fermented for 4 to 5 days at a temperature of 25°C to 30°C, which can increase the crude protein content in the feed by about 15%. Feeding weaned piglets with this nitrogen-fixing diet can increase the weight by about 100 grams per day.
The production and quality of enzyme preparations produced by plants are unstable due to the influence of growth area, season, climate, etc. The enzymes produced by animals are mainly extracted from the glands of slaughtered livestock, and the source is limited; only enzymes produced by microorganisms can meet the needs of any scale, with high yield and stable quality. Microbial enzyme preparations can not only replace the main types of animal and plant enzyme preparations with the same performance, but also produce high-temperature-amylases that act as catalysts at 100°C and detergent proteases that act at pH 10-12. In the 1940s, the microbial enzyme preparation industry developed rapidly. At present, the production of enzyme preparations is mainly based on deep fermentation, supplemented by semi-solid fermentation, and the ability of the strains to produce enzymes has also been greatly improved. The immobilized enzyme and immobilized cell technology developed in the 1960s and 1970s enabled the enzyme to be used repeatedly and continuously reacted, and its scope of application was also expanded. At present, in addition to the food and textile industries, microbial enzyme preparations are also used in daily chemistry, chemicals, pharmaceuticals, feed, papermaking, building materials, biochemistry, clinical analysis and other aspects, becoming an important sector of the fermentation industry.
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