Stooling in Weaner Pigs. What Is True, What Is Risky, and What Actually Works

[Henlus]

You can know if weaner pigs have fever in two ways: accurate method and field signs.

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1. Accurate way (best method)
Use a digital thermometer (rectal).
Normal temperature for pigs:
38.7°C – 39.8°C
How to check:

• Lubricate the thermometer (oil or petroleum jelly)
  
• Insert gently into the anus about 2–3 cm
  
• Hold for 30–60 seconds
  

Interpretation:

• Below 40°C → Normal
  
• 40.0 – 40.5°C → Mild fever
  
• Above 40.5°C → Fever (likely infection)
  

If several weaners are above 40°C, infection is likely.

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2. Signs of fever (when no thermometer is available)
These signs together suggest fever:

• Hot ears, snout, or belly when touched
  
• Dullness or weakness
  
• Reduced appetite or refusing feed
  
• Huddling together even when weather is warm
  
• Shivering or rapid breathing
  
• Sunken eyes (often with dehydration)
  

Note: One sign alone is not enough. Look for multiple signs.

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3. Fever vs feed-related diarrhea
This is very important.

• Diarrhea + fever
  Likely bacterial or viral infection
  Antibiotics may be needed
  
• Diarrhea without fever
  More likely feed change, stress, PKC overload, or gut imbalance
  Focus on electrolytes, feed adjustment, and probiotics
  

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4. What to do if fever is confirmed

• Start treatment early
  
• Dose drugs based on body weight
  
• Provide electrolytes alongside treatment
  
• Keep pigs warm and dry
  

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Summary
The thermometer is the most reliable method.
Touch and behavior help, but they are not 100 percent accurate.
Always confirm fever before jumping to antibiotics.