Summary
In this article, you will find the latest veterinary approaches, diagnostic methods and treatment protocols on what causes diarrhea in calves? causes and treatment.
What Causes Diarrhea in Calves?
Calf diarrhea (neonatal diarrhea, scours) is one of the most significant causes of calf losses. With proper management and early intervention, losses can be substantially reduced.
Importance of Diarrhea
Statistics
- 50-75% of calf deaths are caused by diarrhea
- Most at-risk period: First 30 days
- Peak incidence: 1-2 weeks of age
Economic Impact
- Treatment costs
- Death losses
- Growth retardation
- Labor loss
Causes of Diarrhea
1. Infectious Causes
Bacterial
E. coli (Colibacillosis)
- Most common cause
- Occurs in the first 1-4 days
- Enterotoxigenic (ETEC) type
- Yellow-white watery diarrhea
Salmonella
- Severe, bloody diarrhea
- High fever
- Systemic effects
- Zoonotic (transmissible to humans)
Clostridium perfringens
- Can cause sudden deaths
- Types C and D
- Bloody, necrotic intestine
Viral
Rotavirus
- Most common viral agent
- In calves aged 5-14 days
- Yellow-green watery diarrhea
- Acidic odor
Coronavirus
- In calves aged 5-21 days
- Symptoms similar to Rotavirus
- Respiratory signs may accompany
BVD (Bovine Viral Diarrhea)
- Immune suppression
- Susceptibility to other infections
- Chronic course
Parasitic
Cryptosporidium
- In calves aged 1-3 weeks
- Watery, pale yellow diarrhea
- Difficult to treat
- Zoonotic
Coccidiosis (Eimeria)
- In calves older than 3 weeks
- Bloody diarrhea
- Triggered by stress
2. Nutritional Causes
Overfeeding
- Excessive milk/milk replacer quantity
- Concentration errors
- Passage of undigested nutrients
Irregular Feeding
- Variable feeding times
- Temperature differences
- Sudden feed changes
Poor Quality Feed
- Spoiled milk/milk replacer
- Contaminated feed
- Unsuitable additives
3. Environmental Factors
Poor Hygiene
- Dirty housing
- Contaminated equipment
- Overcrowding
Stress Factors
- Cold stress
- Heat stress
- Transportation
- Dehorning
Causes of Diarrhea by Age
| Age | Possible Causes |
|---|---|
| 0-3 days | E. coli (ETEC), Insufficient colostrum |
| 4-14 days | Rotavirus, Coronavirus, Cryptosporidium |
| 2-4 weeks | Cryptosporidium, Salmonella |
| 4+ weeks | Coccidiosis, Nutritional causes |
Clinical Signs
Mild Diarrhea
- Soft-to-watery feces
- Normal behavior
- Suckling desire present
- Mild dehydration
Moderate Diarrhea
- Watery feces
- Weakness
- Decreased suckling desire
- Moderate dehydration (5-8%)
- Sunken eyes
Severe Diarrhea
- Profuse watery diarrhea
- Recumbency, unable to stand
- No suckling desire
- Severe dehydration (8-12%)
- Hypothermia
- Signs of shock
Dehydration Assessment
| Indicators | 5-6% | 7-8% | 9-12% |
|---|---|---|---|
| Sunken eyes | Mild | Noticeable | Severe |
| Skin elasticity | 2-4 sec | 4-6 sec | >6 sec |
| Oral mucosa | Slightly dry | Dry | Very dry |
| Extremities | Normal | Cold | Very cold |
| Consciousness | Normal | Depressed | Near comatose |
Treatment
1. Fluid Therapy (Rehydration)
Oral Rehydration
Preferred in mild-to-moderate cases.
Ideal ORS Contents:
- Sodium: 90-120 mmol/L
- Glucose: 50-100 mmol/L
- Potassium: 20-30 mmol/L
- Bicarbonate or citrate buffer
Administration:
- 4-6 times per day
- 1-2 liters per feeding
- Warm (38°C / 100°F)
- Via nipple bottle or tube
Intravenous Fluids
Required in severe dehydration and shock.
- Must be administered by a veterinarian
- Isotonic solutions
- Bicarbonate supplementation
2. Milk Feeding
- Do not withhold milk in mild cases
- Reduce volume, increase frequency
- Give ORS and milk in separate feedings
3. Medication
Antibiotics
- Only for bacterial infections
- With veterinary prescription
- Complete the full course
Antiparasitic
- Cryptosporidium: Halofuginone
- Coccidiosis: Sulfonamides, toltrazuril
4. Supportive Care
- Warm and dry environment
- Individual pen
- Careful observation
Prevention
Colostrum Management
- 3-4 liters within the first 2 hours
- Quality colostrum (Brix > 22%)
- Pasteurization may be considered
- Keep a frozen stock
Hygiene
- Calving area cleanliness
- Equipment disinfection
- Hand washing
- Isolation of sick calves
Vaccination
- Vaccinating the pregnant cow
- E. coli, Rotavirus, Coronavirus vaccines
- 3-4 weeks before calving
Housing Management
- Adequate space
- Good ventilation
- Dry bedding
- All-in all-out system
Vitamin-Mineral Support
VK Pro Performance Calf:
- Immune support
- Protects intestinal health
- Vitamin E and selenium
- Zinc (intestinal epithelial health)
When to Call the Veterinarian?
- Severe dehydration
- Diarrhea lasting more than 24 hours
- Bloody diarrhea
- Fever (>39.5°C / 103°F) or hypothermia (<37°C / 98.6°F)
- Loss of suckling desire
- If multiple calves are affected
Conclusion
Calf diarrhea is a multifactorial syndrome. Prevention (colostrum, hygiene, vaccination) is more effective and economical than treatment. Early intervention and proper rehydration are lifesaving.
Early veterinary intervention is critically important in calves with diarrhea.