Application of lactic acid bacteria preparation in pig production
Author：Aomron Time：2017-03-06 Hits：883
Among numerous microbial additives, lactic acid bacteria preparations are the most widely used and have a good effect in the feeding of microbial additives. It is a major commensal bacterium of the digestive tract of various animals and can form normal flora. It is also one of the earliest two feed-grade microbial additive strains that can be used directly in China. A large number of reports have proved that such feed microbial additives have good biological functions and have been widely used in the feed industry. Lactic acid bacteria can be colonized in the intestinal tract of animals to help digestion and metabolism of foods, promote the absorption and utilization of nutrients, and at the same time it can compete with pathogenic bacteria, inhibit the reproduction of harmful bacteria, improve the intestinal environment, and adjust the flora of the gastrointestinal tract. Balance and improve animal health. In pig production, the application of lactic acid bacteria preparations can achieve the effect of increasing daily weight gain, improving the feed-to-weight ratio, enhancing the body's resistance to disease, increasing the survival rate, reducing the rate of diarrhea, and increasing economic efficiency. Therefore, more and more research has been done on the use of lactic acid bacteria preparations and their applications in raising pigs in recent years.
1. Growth promoting effect of lactic acid bacteria preparations on piglets has been widely confirmed, but due to the performance of piglets growth performance is affected by a variety of factors (variety, feeding type, nutrient level, optimal strain type, optimum addition amount, optimum Due to the influence of dosage forms, best feeding methods, etc., the results of research on lactic acid bacteria preparations to improve growth performance of piglets are not the same, so more research in this area is still underway in recent years. Some scholars have added different proportions (0.1%, 0.2%) of lactic acid bacteria preparation (granule shape, Lactobacillus bulgaricus) to piglets to study their effects on the performance of piglets. Compared with the control group without lactic acid bacteria preparations, the two test groups significantly increased the daily gain and feed weight ratio of the weaned piglets. Although the survival rate was not significantly different from that of the control group, it increased to varying degrees, and in addition to the lactic acid bacteria preparation The addition also significantly reduced the rate of diarrhea in weaned piglets. The test results show that the addition of lactic acid bacteria can significantly improve the performance of weaned piglets, but the influencing factors and the best effect still need to be further studied.
2. Improve the gut environment Animals in the digestive tract microbial population complex, under normal circumstances, through the interaction between beneficial bacteria and harmful bacteria, so that there is a dynamic balance between the microorganisms, this balance will be destroyed once the body Has an adverse effect. It has long been known that lactic acid bacteria have beneficial effects on improving host nutrition, regulating the intestinal flora structure, and improving the intestinal environment. Some researchers selected 72 weaned piglets to study the effect of lactic acid bacteria on the physiological and biochemical indicators of the weaned piglets. The results showed that feeding the piglets with 1.5% Lactobacillus preparations for 6 h significantly reduced the pH of the caecum, colon, and rectum, significantly reduced the concentration of cecum ammonia, and the amylase activity of duodenum and jejunum was increased. Significantly increased, there was no significant difference in the number of E. coli and the number of total bacteria in the hindgut and feces, but the number of Lactobacillus in the cecum increased significantly. The results of the study showed that the addition of lactic acid bacteria to the feed of piglets in the form of spices can significantly improve the intestinal environment and bacterial structure of piglets. In addition, there is research carried out on the basis of basal diets, adding 30 mL of plant-derived lactic acid bacteria preparations per day to influence the intestinal microflora structure of the hybrids. The results showed that the contents of the contents of the digestive tract in the supplemented group were all decreased, and the number of lactic acid bacteria was higher than that of the control group, and reached a significant level in the fundus, duodenum, and jejunum. In addition, the number of E. coli in the cecum and colon contents was significantly reduced, indicating that plant-derived lactic acid bacteria can effectively inhibit the reproduction of harmful bacteria and improve the microecological balance of the digestive tract of animals.
3. Immunopromoting effects Several studies have shown that lactic acid bacteria preparations can enhance the specificity and nonspecific immunity of piglets while improving their growth performance and intestinal environment. Lactobacillus can promote the body's immune response, because these bacteria produce metabolic products such as proteins and peptides in the metabolic process, can activate the body's immune system. This immune-promoting effect of Lactobacillus has also been confirmed in some Chinese studies in recent years. A total of 165 35-day-old, large, long-term mixed-boar boars were selected to study the effects of plant-derived lactic acid bacteria on immune function in weaned piglets. The results showed that the addition of lactic acid bacteria in the diets of weanling piglets can improve the performance of piglets, increase serum T4 and IGF-1 levels, increase lymphocyte transformation rate and IgG levels, and increase the levels of IgA and IgM. , indicating that lactic acid bacteria promote the immune function of weaned piglets.
In recent years, as people have paid extensive attention to the safety of animal foods, research and development of feed additives that are green, safe, and effective substitutes for antibiotics and antibacterial drugs have become a research hotspot. Among them, the study of lactic acid bacteria micro-ecological agents has also become one of the focuses of research in recent years. It provides a new way for the healthy development of feed and livestock breeding industry, which is efficient, pollution-free and pollution-free. Its production and development conforms to the current high-tech industrialization and the emphasis on health and environmental protection. In the application, it fully considers the characteristics of the animal flora itself and the relationship between the host and the environment. The scientific and rational use of such micro-ecological agents will certainly It has become the mainstream of feed additives in this century.