Solutions Chart: Gram-Positive vs. Gram-Negative
This table categorizes common feed additives and veterinary medicines by their primary spectrum of activity.
| Category | Gram-Positive Targeting (e.g., Clostridium, Staph, Strept) | Gram-Negative Targeting (e.g., E. coli, Salmonella, Pasteurella) |
| Primary Goal | Gut integrity, preventing Necrotic Enteritis, growth promotion. | Controlling diarrhea (scours), respiratory health, food safety. |
| Key Feed Additives | Avilamycin, Enramycin, Bacitracin (BMD), Flavomycin. | Organic Acids (Formic/Propionic), Essential Oils (Thymol), Colistin. |
| Common Antibiotics | Penicillins, Tylosin, Tilmicosin, Lincomycin. | Neomycin, Apramycin, Gentamicin, Polymyxins. |
| Broad Spectrum | N/A (Specialized agents) | Doxycycline, Amoxicillin, Florfenicol, Enrofloxacin. |
| Cell Wall Target | Thick Peptidoglycan layer (Easier to penetrate). | Thin Peptidoglycan + Outer Lipid Membrane (Harder to penetrate). |
Strategy Guide: Choosing the Right Product
1. When to focus on Gram-Positive (G+)
Signs: Poor feed conversion (FCR), loose "orange" droppings, or sudden mortality in broilers (Necrotic Enteritis).
Top Choice: Avilamycin is the ideal preventive choice due to its high stability and 0-day withdrawal period. For severe outbreaks, Enramycin provides superior "knockdown" power.
2. When to focus on Gram-Negative (G-)
Signs: Severe watery diarrhea in piglets, respiratory distress (coughing/panting), or high Salmonella counts in environmental samples.
Top Choice: Use Organic Acidifiers in water or feed as a primary barrier. For clinical treatment, Colistin or Neomycin are the standard choices for enteric G- infections.
3. When to use Broad Spectrum
Signs: "Mixed" infections where both respiratory and enteric symptoms are present, or when the specific pathogen has not yet been identified by a lab.
Top Choice: Doxycycline or Florfenicol are highly effective for systemic issues that require deep tissue penetration.
The "Synergy" Approach
Most modern farms do not choose just one. A standard high-performance program often looks like this:
Base: Organic Acids (G- control) + Probiotics (Microbiome balance).
Preventive: Avilamycin (G+ control) added to the starter and grower feed.
Rotation: Switching to Enramycin every few cycles to maintain bacterial sensitivity.