Effect of acidifier on the application of wea*piglets
ABSTRACT: Acidifier is a kind of green feed additive without resistance, residue and side effects, and it is feasible to substitute acidifier for antibiotic additives. With the development of acidifier research and processing technology, acidifier will develop towards functional type, not only supplementing acid for weaned piglets, but also reflecting its feed anti-mildew effect. It has good application prospects because of its role in promoting growth.
Key words: acidifier, weaning piglets, mechanism, application effect
Types and action mechanism of 1 acidifier
With people's increasing attention to food safety issues, China has issued relevant regulations to strictly limit the use of antibiotic additives and their usage and dosage. It is only a matter of time before antibiotic additives leave the stage of history. As one of the most potential alternatives, Acidifiers will play an important role in the future green aquaculture industry.
Acidifiers include inorganic acidifiers, organic Acidifiers and compound acidifiers. Inorganic Acidifiers mainly include sulphuric acid, hydrochloric acid and phosphoric acid, while sulphuric acid and hydrochloric acid are strong acids. Although diluted can make silage sink rapidly, inhibit impurities and reduce pH value, they will produce negative balance of calcium and affect mineral metabolism in the body, affect animal bone development, and strong acid. The strong corrosiveness will bring harm to human beings. Phosphoric acid is a relatively safe acidifier, but excessive use can also pollute the environment. Organic acids are mainly used in production practice and can directly participate in the body's tricarboxylic acid cycle, including citric acid, fumaric acid, lactic acid, propionic acid, malic acid, acetic acid, etc. The first three are the most widely used and have a good effect. Compound acidifiers, including total-acid acidifier and salt acidifier, have positive effects on digestive activity and growth performance of weaned piglets.
The physiological digestion of weaned piglets has the following characteristics: the digestive system of wea**piglets is not well developed, the secretion of gastric acid and digestive enzymes is insufficient, the microflora of gastrointestinal tract is unstable, the immune system is not perfect, the function is low, and the disease resistance is weak. Acidifiers can reduce the pH value of gastrointestinal tract and increase the digestive enzyme activity of piglets. Acidifiers can improve the microflora of gastrointestinal tract, slow down the rate of food emptying in the stomach, promote digestion, enhance the anti-stress effect of animals, improve the immunity of the body, reduce the acid binding capacity of feed, and other possible mechanisms of action of acidifiers.*
Application of acidifier 2 in weaning piglets*
Most of the lactation piglets have adopted early weaning technology. This technology has brought good economic benefits to the farmers. However, weaned early weaned piglets to different degrees of diarrhea on 2~3 days after weaning, thus affecting the growth and development of piglets, making individual piglets become stiff pigs or even death. At present, weaning piglets at 3-4 weeks old is generally practiced in China, which easily leads to "early weaning syndrome" in piglets, which is characterized by**loss of appetite, digestive disorders, diarrhea, growth retardation and low nutritional conversion rate. Early weaned piglets have insufficient secretion of gastric acid and digestive enzymes, incomplete digestion of diets, and residual residues provide a suitable breeding environment for pathogenic microorganisms, causing diarrhea in piglets and affecting the growth and development of piglets. On the one hand, due to the development of digestive system of weaned piglets is not perfect, the secretion of gastric acid is insufficient, on the other hand, dairy products in feed can not meet the nutritional needs of piglets, resulting in a decrease in lactic acid production, leading to a significant increase in gastrointestinal pH value of piglets, which further reduces the digestive enzyme activity and restricts the activation of proteogen, so fish meal, soybean meal and other protein feed can not Good digestion. Small digestive tract volume and short digestive time are natural digestive deficiencies of piglets. In theory, some feedstuff nutrition techniques may prolong the retention time of food in digestive tract, but it is quite difficult; moreover, prolonging the digestion time will increase the probability and degree of diarrhea in piglets when the digestibility of feed is not high. Acidifiers can reduce gastrointestinal PH, activate pepsin and improve gastrointestinal microflora, thereby improving the growth performance of weaned piglets. Adding acidifier to the diet of weaned piglets can supplement the insufficient secretion of gastric acid, improve the activity of digestive enzymes, promote the reproduction of probiotics such as lactobacillus, inhibit the proliferation of harmful microorganisms, and overcome or alleviate weaning syndrome. At present, it has also been widely used in weaned piglet feed. The research on adding organic acidifier to piglet feed has been started since 1960s. In China, the research on adding effect of organic acidifier is mainly focused on several aspects, and it started late.
Jia et al. (2010) found that slow-release compound acidifier could improve intestinal morphology and function by reducing intestinal pH, thereby enhancing intestinal adaptability and immunity of weaned piglets, and ultimately promoting the growth of piglets. Yan Jiayou et al. (2009) and Jia et al. (2010) have similar results. Lin Yingcai et al. (2001) found that dietary supplementation of 0.15% complex acidifier increased the number of lactobacillus, Escherichia coli and bacteria in the small intestine of piglets with 4-7kg diet, increased the proportion of Lactobacillus and decreased the proportion of Escherichia coli in the total number of bacteria, indicating that the compound acidifier not only directly affected the reproduction of bacteria in the intestinal tract of piglets, but also mainly affected the microbial area in the intestine. System balance. Zhu Wentao et al. (2004) also found that dietary citric acid supplementation of 2%, 3% and 4% could significantly improve the apparent digestibility of organic matter and crude protein in the diet of weaned piglets (P*0.05). Luna (2008) added acidifier 1 (0.4% phosphoric acid) to piglet diets*