Question

Which among the followings is an example of a probiotic

• A. Bacteriocins
• B. Fructooligosaccharides
• C. Lactobacillus acidophilus
• D. Monensin

Hint:

To prevent confusion, remember:
- Probiotics are the live bacteria themselves (like Lactobacillus).
- Prebiotics are the food (non-digestible fibers like FOS) that support those bacteria.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Feed additives are substances added to animal feed to improve nutrient utilization, gut health, and overall performance. Probiotics, prebiotics, and antibiotics represent different classes of these additives.

Step 2: Detailed Explanation:
Let us analyze each of the given options:

Probiotics: By definition, probiotics are live microorganisms that, when administered in adequate amounts, confer a health benefit on the host.
They colonize the gut, competitively exclude pathogenic bacteria, synthesize lactic acid to lower pH, and secrete digestive enzymes.
Lactobacillus acidophilus is a beneficial, lactic acid-producing bacterium widely used as a direct-fed microbial (probiotic) in animal nutrition. Thus, this is the correct example.

Fructooligosaccharides (FOS): This is a class of non-digestible carbohydrates that serve as selective nutrients for beneficial gut bacteria. This is aprebiotic, not a probiotic.

Bacteriocins: These are proteinaceous toxins produced by bacteria to inhibit the growth of similar or closely related bacterial strains. They are antimicrobial peptides, not live probiotic cultures.

Monensin: This is an ionophore antibiotic commonly used as a feed additive in ruminant diets to alter rumen fermentation (selecting for propionate-producing bacteria) and prevent coccidiosis. It is a chemical drug, not a probiotic.
Therefore, Lactobacillus acidophilus is the probiotic among the choices.

Step 3: Final Answer:
The correct option is (C), representing Lactobacillus acidophilus.