Acidifiers

Feed Additives for Improving Pig Digestion

Modern pig farming demands high efficiency and safety at all stages of production. This is especially true for pig feeding, as the correct diet and quality feed additives directly affect the growth, health, and reproductive function of the animals. One of the important components of the feeding system is acidifiers—substances that stabilize the acid-base balance in the digestive tract, improve feed digestibility, reduce pathogenic microflora, and support overall homeostasis in the intestine.

These additives became particularly relevant after the ban on using antibiotics as growth promoters. Today, acidifiers have become a reliable alternative to prophylactic antibiotics, especially in the feeding of piglets, sows, and finishing pigs.

Acidifiers are a group of additives that lower the pH in the gastrointestinal tract of pigs, creating an unfavorable environment for the development of pathogenic microflora. They can be of organic or inorganic origin, liquid or dry, natural or synthetic.

The main task of acidifiers in pig diets is to improve the acidity of the stomach and intestines, which promotes:

• optimal action of gastric enzymes;
• better protein digestion;
• reduced proliferation of harmful bacteria (such as E. coli, Salmonella);
• reduced risk of diarrhea in piglets;
• improved absorption of nutrients from feed.

Acidifiers can be classified according to different criteria:

1. By composition:

• Organic acids: formic, acetic, propionic, citric, lactic, fumaric, etc.
• Inorganic acids: phosphoric, sulfuric (rarely used due to aggressiveness).
• Acid salts (e.g., calcium salt of formic acid).
• Combined preparations: mixtures of several acids for a wide range of effects.

2. By form:

• Dry (in the form of powders or granules) — convenient for mixing in feed.
• Liquid — used in drinking systems.

3. By action direction:

• Gastric — aimed at lowering pH in the stomach.
• Intestinal — active in the small and large intestine.

After weaning, piglets undergo significant stress: feed changes, environmental changes, and gut microflora disruption. Due to the unstable acidity of gastric juice, pepsin activity—the main protein-digesting enzyme—decreases. This leads to incomplete protein absorption, increased residual protein in the intestines, active proliferation of pathogenic bacteria, diarrhea, mortality, and reduced growth.

Benefits of using acidifiers in piglet diets:

• Lower stomach pH to the optimal level (3.5–4.0).
• Promote better absorption of protein and minerals.
• Improve appetite.
• Reduce instances of diarrhea.
• Stimulate the growth of beneficial microflora.
• Increase average daily weight gain.
• Reduce the need for antibiotics.

A sow’s diet plays a key role in ensuring proper embryo development, the quality of colostrum and milk, the immunity of newborn piglets, and subsequent productivity. Disruptions in the acid balance of the digestive tract lead to poor feed absorption, weight loss, decreased fertility, and even abortions. Using acidifiers in the sow’s diet:

• Improves protein and mineral digestibility.
• Reduces the toxic load from undesirable microflora.
• Supports the microbiological balance of the intestine.
• Prevents constipation in lactating sows.
• Reduces endotoxin levels in the blood.

Finishing pigs have high growth potential, but the effectiveness largely depends on the quality of feeding. Farmers often encounter problems related to unstable appetite, low feed conversion ratio, slow growth, cannibalism, or chronic diarrhea. Acidifiers in the finishing pig diet help avoid these problems and improve digestibility, optimize digestion by lowering pH, increase feed intake, reduce the frequency of intestinal disorders, and improve herd retention.

Important: not every additive is suitable for every type of feed—acidifiers can react with other ingredients.

Acidifier effectiveness significantly increases when used together with:

• Probiotics — support beneficial microflora (e.g., Bacillus subtilis).
• Prebiotics — provide nutrients for microbes (inulin, oligosaccharides).
• Enzymes — improve digestibility of feed components (e.g., xylanase, protease).
• Toxin adsorbents — reduce the action of mycotoxins in feed.

Together, they create a synergistic effect — animals get sick less, grow better, and the need for veterinary intervention decreases.

Although acidifiers have numerous benefits, improper use can cause problems:

• Overdose → damage to the stomach lining, decreased blood pH.
• Incompatibility with mineral feed components → precipitation of salts.
• Excessive acidity → reduced feed intake.
• Incompatibility with some antibiotics and enzymes.

Recommendation: always conduct a trial introduction and consult with a veterinarian or zootechnician about additives.

Acidifiers are a modern, effective tool for improving the efficiency of pig feeding, reducing the risk of diseases, optimizing the diet, and improving production economics.

They are especially important for: piglets — during weaning and adaptation; sows — to improve reproductive qualities and milk quality; finishing pigs — to improve growth and reduce feed costs.

When applied correctly, acidifiers:

• Stabilize the acid-base balance;
• Create a barrier against pathogenic bacteria;
• Improve protein and mineral digestibility;
• Reduce antibiotic usage;
• Increase production profitability.

In modern conditions, when competition is growing and the demands for product quality are becoming stricter, acidifiers should take a worthy place in the feeding and health system of pigs. They are not just an additive — they are part of an intelligent approach to livestock farming.