Ketosis in Dairy Cows: Causes, Symptoms and Prevention with Nutrition

Ketosis is one of the most common metabolic diseases in the postpartum period in high-yielding dairy cows. This situation, which develops as a result of negative energy balance, paves the way for a decrease in milk yield, reproductive problems and other metabolic diseases. Ketosis can be largely prevented with the right transitional nutrition.

1. What is Ketosis?

1.1 Definition

Ketosis is the excessive accumulation of ketone bodies (beta-hydroxybutyrate, acetoacetate, acetone) in the blood as a result of the body's intensive use of fat stores to meet its energy needs.

1.2 Pathophysiology

• Energy requirements for milk production increase dramatically after birth
• Feed consumption (dry matter intake) cannot increase sufficiently
• Negative energy balance (NEB) occurs
• Mobilizes body fat stores
• The liver cannot fully metabolize fatty acids
• Ketone bodies accumulate

1.3 Risk Period

• First 2-6 weeks after birth (peak: 2-4 weeks)
• The period when milk yield is highest
• The period when dry matter intake has not yet reached its maximum

2. Types of Ketosis

2.1 Clinical Ketosis (Type I - Primary)

Symptoms:

• Loss of appetite (rejects concentrate at first)
• Sudden decrease in milk yield
• rapid weight loss
• Acetone odor in breath and milk
• constipation, dry stools
• Lethargy, depression
• Nervous symptoms (rare): Licking, chewing, aggression

2.2 Subclinical Ketosis

• No obvious clinical signs
• Blood BHB: 1.2-2.9 mmol/L
• Hidden decrease in milk yield
• Decreased reproductive performance
• Increased susceptibility to other diseases
• It can be seen in 20-40% of the herd!

2.3 Secondary Ketosis (Type II)

• Due to another disease (abomasum displacement, metritis, mastitis)
• Any situation that reduces feed consumption
• The underlying cause must be treated

2.4 Fatty Liver Syndrome

• Severe NEB and excessive fat mobilization
• Fat accumulation in the liver
• liver dysfunction
• poor prognosis
• Especially in cows that are overweight at birth

3. Risk Factors

3.1 Cow Factors

• High milk yield potential
• Extreme body condition at birth (BCS >3.75)
• Older cows (3+ lactation)
• Previous history of ketosis
• twin pregnancy

3.2 Nutrition Factors

• Overfeeding during the dry period
• Insufficient energy during the transition period
• Low dry matter intake
• insufficient fiber
• Sudden ration changes
• Low quality roughage

3.3 Management Factors

• Insufficient feed area
• Social stress (pack hierarchy)
• hot stress
• Inadequate water access

4. Diagnosis

4.1 Clinical Examination

• Acetone odor (breath, milk)
• Loss of body condition
• loss of appetite

4.2 Laboratory Tests

4.3 Herd Scanning

• 5-14 days after birth. BHB measurement on days
• If more than 10% of the herd is positive, there is a herd problem
• Early detection, early intervention

5. Treatment

5.1 Clinical Ketosis Treatment

• IV Dextrose: 500 ml 50% dextrose
• Oral propylene glycol: 300-500 ml, 1-2 times a day, 3-5 days
• Corticosteroids: Stimulates gluconeogenesis (use with caution)
• Vitamin B12: Propionate metabolism
• Supportive care: Quality feed, water

5.2 Treatment of Subclinical Ketosis

• Oral propylene glycol: 300 ml/day, 3-5 days
• Ration evaluation and correction
• Fixing underlying problems

6. Prevention through Nutrition

6.1 Dry Period Nutrition (Last 60 Days)

Early dry period (60-21 days):

• Energy: 1.25-1.30 Mcal NEL/kg KM
• Protein: 12-14% HP
• Avoid overfeeding
• BCS 3.25-3.5 target

Transition period (Close-up, last 21 days):

• Energy: 1.50-1.60 Mcal NEL/kg KM
• Protein: 14-15% HP
• Maximizing dry matter intake
• Concentrated feed increase for rumen adaptation

6.2 Postpartum (Fresh Cow) Nutrition

6.3 Increasing Dry Matter Intake

• Quality, delicious roughage
• Sufficient feed area (75+ cm/cow)
• Fresh feed, frequent pushing
• Clean, fresh water (unlimited access)
• Comfortable environment (hot stress management)
• Reducing social stress

6.4 Energy Contributions

6.5 Choline and Methionine

• Romanian protected choline: Increases fat output from the liver
• Rumen protected methionine: For VLDL synthesis
• Reduces the risk of fatty liver

6.6 Niacin (Vitamin B3)

• Reduces fat mobilization
• Romanian protected form preferred
• Dose: 6-12 g/day

7. Body Condition Management

7.1 Target BCS

7.2 Avoiding Overconditioning

• Avoid overfeeding in late lactation
• Energy restriction in the dry period
• Regular BCS follow-up

8. Herd Monitoring

8.1 Early Warning Indicators

• Lower-than-expected increase in postpartum milk yield
• High rate of abomasum displacement
• low reproductive performance
• High removal rate

8.2 Routine Scanning

• 5-14 days after birth. BHB test on days
• Sampling 10-15% of the herd
• 10%+ positivity = herd problem

9. Economic Impact

• per case of subclinical ketosis 200-300 USD lost
• loss of milk yield
• Reproductive performance decline
• Other disease risks
• Early culling

Conclusion

Ketosis is a metabolic disease that is largely preventable with proper transitional management.

Basic strategies:

1. Optimal body condition at birth (BCS 3.25-3.5)
2. Gradual ration change during the transition period
3. Maximizing dry matter intake
4. High energy density postpartum ration
5. Energy additives (propylene glycol, bypass oil)
6. Early detection with routine BHB screening
7. Minimization of stress factors

Bibliography