Milk Fever (Bovine Parturient Paresis): Pathogenesis, Clinical Stages, and Nutritional Prevention Strategies

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1. Introduction

Milk fever is one of the most important metabolic disorders in dairy cattle, especially in older, high milk-yielding dairy cows [1, 6]. Unlike small animal eclampsia, milk fever in cattle is accompanied by progressive flaccid paralysis rather than tetany. However, subclinical hypocalcemia, where the cow is standing but has low blood calcium levels, is more prevalent and is often accompanied by other diseases such as displaced abomasum, ketosis, and retained placenta [2, 10].



2. Pathogenesis: 

The Calcium GapLactation demands that the cow mobilizes 20-30 grams of calcium daily, while her total blood calcium pool is only 3 grams [2, 4].

•Homeostatic Failure

To overcome the calcium deficit, the cow has to mobilize more calcium from her bones and intestine. This is done with the help of Parathyroid Hormone (PTH) and Vitamin D.

•Risk Factors

High amounts of potassium in the feed, which cause metabolic alkalosis, make PTH receptors insensitive, effectively 'locking' the calcium in the bones when it is most needed [13, 14].•Age and BreedOlder cows have fewer osteoclasts, which are the bone cells responsible for resorbing calcium, and certain breeds, such as Jerseys, are more prone to milk fever [1, 3].

3. Clinical Stages of Milk Fever

The clinical stages of milk fever are divided into three distinct clinical stages according to the level of hypocalcemia experienced by the cow. They are:

•Stage I (Early Signs): 

At this stage, the cow is still standing but shows early signs of restlessness, hypersensitivity, and muscle tremors. This stage is transient and is likely to be overlooked by the farmer.

•Stage II (Sternal Recumbency): 

At this stage, the cow is unable to stand. She is seen sitting with her head tucked into her flank, forming the "S" shape in her neck. Additionally, her ears are cold, and her gastrointestinal tract is paralyzed, causing bloat and constipation.

•Stage III (Lateral Recumbency): 

At this final stage, the cow is lying flat on her side. At this stage, the cow is unable to stand, is insensitive to her surroundings, has a high and weak pulse rate, and is likely to die within hours if not treated immediately.

4. Emergency Treatment: 

Calcium TherapyThe emergency treatment is the slow intravenous infusion of calcium borogluconate solution. This is given at the rate of 500 mL of a 23% solution.

•Response to Treatment: 

If the treatment is effective, the response is dramatic, with the cow likely to belch, pass stool, and attempt to stand.•Relapse Risk: Approximately 20% of the cows are likely to experience a relapse within 24 to 48 hours.

•Caution: 

Caution is exercised when giving the IV calcium borogluconate solution slowly while at the same time monitoring the heart, which may lead to cardiac arrest if the solution is rapidly infused.

5. Prevention: The DCAD Revolution

Today's prevention strategies are centered around the "pre-fresh" dry period diet, designed to "prime" the calcium mobilization system of the cow. This allows for a more efficient mobilization of calcium from the bones as soon as she calves. The strategies are as follows:

•DCAD Management

By feeding a diet of anionic salts, such as ammonium chloride, to create a state of "negative" DCD, the PTH receptors of the cow are "primed" to mobilize calcium from the bones as soon as she calves.

•Low Potassium Diets

Limiting the amount of potassium in the dry cow diet helps prevent metabolic alkalosis.

•Oral Calcium Boluses

This involves giving oral calcium boluses to the cow as soon as she calves and again 24 hours later. This has become a popular solution for dairy producers, especially for high-risk cows.

6. Conclusion

Milk fever is a complex issue for the dairy industry. Emergency IV therapy for clinical cases of milk fever is highly successful, but the true battle for dairy producers and dairy companies is preventing subclinical hypocalcemia, and this requires complex nutritional strategies. DCAD management of the dry cow diet and careful pre-fresh diets are the keys to a smooth transition for dairy cows, resulting in a more successful and healthy dairy herd.

References

[1] Phibro Animal Health. Milk fever in cows - Causes, symptoms and how to prevent. https://europe.pahc.com/challenges/milk-fever

[2] UMN Extension. Prevention and treatment of milk fever. https://extension.umn.edu/dairy-milking-cows/hypocalcemia

[3] University of Wisconsin–Madison. Fresh cows: Milk fever. https://dairy.extension.wisc.edu/articles/fresh-cows-milk-fever/

[4] Farm Health Online. Milk Fever - Caused by a calcium deficiency. https://www.farmhealthonline.com/en/disease-management/cattle-diseases/milk-fever/

[6] Moocall. (2022). Milk Fever in Cows - Causes, Symptoms & Treatment. https://www.moocall.com/milk-fever-in-cows/

[8] PubMed. (2026). Recurring hypocalcemia of bovine parturient paresis. https://pubmed.ncbi.nlm.nih.gov/2737159/

[11] ResearchGate. Milk fever in dairy cows: A systematic review. https://www.researchgate.net/profile/Nuraddis-Ibrahim/publication/350942379

[13] AH Animal Nutrition. Use of Acidifying Diets for Prevention of Milk Fever. https://ahanimalnutrition.com/storage/app/uploads/public/674/f35/2ec/674f352ecaddf139351889.pdf

[14] Veterinary World. (2011). Prevention of Milk fever: Nutritional Approach. https://www.veterinaryworld.org/Vol.4/June%20-%202011/Prevention%20of%20Milk%20fever%20%20Nutritional%20Approach.pdf

[15] Resco Global. Milk fever in cows: everything you need to know. https://www.resco-global.com/en/blog/milk-fever-in-cows-everything-you-need-to-know

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