Preventing Necrotic Enteritis in Broilers Without Antibiotics: The Role of Probiotics in Modern Farming

Necrotic enteritis (NE) caused by Clostridium perfringens is one of the most detrimental enteric diseases in broilers. In the era of antibiotic-free farming (AGP-free), the incidence of NE has actually increased because the role of antibiotics as growth promoters and pathogen suppressors is reduced. Without proper intervention, NE can cause significant economic losses: high mortality, worsened FCR, and decreased body weight. So, how can necrotic enteritis in broilers be effectively and sustainably prevented? The answer lies in probiotic-based gut management, particularly formulas containing Lactobacillus acidophilus, Bacillus subtilis, and Bacillus coagulans. This article will thoroughly discuss the mechanisms, applications, and scientific evidence behind this strategy.

Understanding Necrotic Enteritis: Causes and Impact on Broilers

Necrotic enteritis is a bacterial infection of the small intestine caused by Clostridium perfringens types A and C. These bacteria produce toxins (NetB, alpha-toxin) that damage the intestinal mucosa, causing tissue necrosis, bloody diarrhea, and sudden death. Predisposing factors include mucosal damage due to coccidiosis, high animal protein feed, overcrowding, and environmental stress. In broilers, NE often occurs at 2–5 weeks of age, with morbidity of 10–40% and mortality of 2–50% if untreated. Subclinical impacts are equally detrimental: reduced growth performance, increased FCR, and heterogeneity in harvest weight.

Why Antibiotics Are No Longer the Primary Solution?

Since the ban on antibiotic growth promoters (AGP) in many countries, farmers face new challenges. Antibiotics are effective in suppressing Clostridium, but their sub-therapeutic use triggers bacterial resistance and leaves residues in meat. In Indonesia, regulations are tightening in line with global market demands for antibiotic-free products. Therefore, NE prevention must shift to non-antibiotic approaches, such as probiotics, prebiotics, organic acids, and feed management.

Probiotics: Mechanisms of Action in Suppressing Clostridium perfringens

Probiotics are live microorganisms that provide health benefits to the host when administered in adequate amounts. In the context of NE, probiotics work through several mechanisms:

Competitive Exclusion

Probiotics compete with Clostridium for adhesion sites on the intestinal epithelium and nutrients. Strains such as Lactobacillus acidophilus have strong adhesion capabilities to intestinal cells, blocking pathogen attachment. Bacillus subtilis and Bacillus coagulans also produce spores that can compete in the gut environment.

Production of Organic Acids

Lactic acid bacteria (LAB) such as Lactobacillus acidophilus ferment carbohydrates into lactic, acetic, and propionic acids. These acids lower gut pH, creating an environment unfavorable for Clostridium perfringens. Low pH also activates digestive enzymes and enhances nutrient absorption.

Production of Digestive Enzymes

Bacillus subtilis and Bacillus coagulans produce protease, amylase, and lipase enzymes that aid in feed digestion. Better digestion reduces undigested protein substrates in the gut, which are triggers for Clostridium growth. In other words, probiotics cut off the pathogen's "food supply."

Immunomodulation

Probiotics stimulate the intestinal mucosal immune system by increasing secretory IgA production, activating macrophages, and regulating cytokines. A stronger immune response helps the body fight infection without excessive inflammation.

Biosolution's Broiler Probiotic Formula: The Right Solution for Integrators

Biosolution presents the Broiler Probiotic Formula specifically formulated for broilers. This product contains three superior strains: Lactobacillus acidophilus, Bacillus subtilis, and Bacillus coagulans. They work synergistically to suppress Clostridium, improve FCR by 8–12%, and increase ADG by 5–10%. Here are the application details:

Composition and Role of Each Strain

• Lactobacillus acidophilus: The main lactic acid bacterium that lowers gut pH and inhibits Clostridium growth through bacteriocin production and adhesion competition.
• Bacillus subtilis: Produces digestive enzymes (protease, amylase, cellulase) and antimicrobial compounds (subtilosin, surfactin) that directly kill pathogens.
• Bacillus coagulans: Heat-resistant spores, making it compatible with feed pelleting. This strain also produces L-lactic acid and supports gut microbiota balance.

Application Method and Dosage

• Via drinking water: 1 ml/L of drinking water, given daily during the starter period (days 1–10) and 3 times per week during the grower–finisher period.
• Via feed: 2 ml/kg of feed, mixed evenly before feeding.
• Best time: Morning after the first feeding, so probiotics reach the gut when pH is still low.

Clinical Benefits

• Suppresses Clostridium perfringens: Laboratory tests show a reduction in Clostridium population by up to 3 log CFU/g feces after 7 days of administration.
• Reduces mortality: Target mortality <3% within 35 days of rearing.
• Improves FCR: Average improvement of 10% compared to control without probiotics.
• No residues: Safe for meat and leaves no antibiotic residues.

Case Study: Application on an Integrator Farm

An integrated broiler farm in West Java with a population of 50,000 birds applied the Broiler Probiotic Formula for 6 cycles. Results:

• Mortality due to NE decreased from 8% to 2%.
• FCR improved from 1.65 to 1.52.
• Average harvest weight increased by 150 grams per bird.
• Farmers reported firmer feces, drier litter, and reduced ammonia odor.

These data show that probiotics not only prevent NE but also improve overall production efficiency.

The Future of Antibiotic-Free Farming: The Role of Probiotics

With increasingly stringent regulations and consumer demands, antibiotic-free farming is no longer an option but a necessity. Probiotics are a key pillar in enteric disease prevention strategies. In the future, combinations of probiotics with prebiotics (synbiotics), organic acids, and phytobiotics will become more optimal. However, the key to success remains consistent application and good farm management.

Conclusion

Necrotic enteritis in broilers can be effectively prevented without antibiotics through the use of multistrain probiotics. Biosolution's Broiler Probiotic Formula, containing Lactobacillus acidophilus, Bacillus subtilis, and Bacillus coagulans, offers a scientifically proven solution: suppressing Clostridium, improving FCR, and supporting residue-free meat production. For integrators looking to transition to modern sustainable farming, consult your needs with the Biosolution team via WhatsApp or see product details at Broiler Probiotic Formula for more information.