If you’ve spent any time raising cattle in the East Kootenays, you know that calving season is both the most rewarding and the most stressful time of year. Between checking heifers in the middle of a cold March night and welcoming new life to the ranch, there’s a lot to manage.

One challenge we see during this time is Milk Fever. Despite the name, it isn’t actually a fever at all. It’s a metabolic “glitch” that can take a healthy, productive cow and put her on the ground in a matter of hours.

What Exactly is Milk Fever?

Milk Fever, known medically as Hypocalcemia, happens when a cow’s blood calcium levels drop too low.

Think of calcium as the “fuel” for muscles and nerves. When a cow starts producing colostrum and milk, her demand for calcium skyrockets – often by 400% or more! If her body can’t pull calcium from her bones or her diet fast enough to keep up with the demand of the udder, her muscles start to fail. This leads to the classic “downer cow” scenario.

Who is Most at Risk?

• High Producers: The more milk she makes, the more calcium she loses.
• Older Cows:  (3rd lactation and up) aren’t as efficient at “mining” calcium from their bones as younger heifers.
• Specific Breeds: Jersey and Guernsey cows are genetically more prone to the condition.

The Three Stages of Milk Fever: Know the Signs

Milk Fever moves fast. Recognizing the early “Stage 1” signs can be the difference between a quick oral treatment and an emergency IV call.

Stage 1: The “Jittery” Phase

The cow is still standing but looks “off.” You might notice:

• Muscle tremors or shivering.
• Shuffling of the hind feet.
• Hypersensitivity (she might be more spooked than usual).
• Pro Tip: This stage is short – often lasting less than an hour.

Stage 2: The “S-Curve” Phase

The cow is now down and cannot get up.

• She often sits with her head tucked into her flank, creating an “S-shape” in her neck.
• Her ears and nose will feel cold to the touch.
• She appears dull, sleepy, or listless.

Stage 3: The Emergency Phase

This is a critical situation. The cow will often be lying flat on her side.

• She may become bloated because her digestive muscles have stopped working.
• She can lose consciousness or slip into a coma.
• Without immediate veterinary intervention, Stage 3 is almost always fatal.

Treatment: What to Do When a Cow is Down

If you find a cow down, call Tanglefoot immediately. Time is of the essence.

1. Safety First: Try to prop the cow up into a “sternal” position (sitting on her chest rather than flat on her side) to help her burp and prevent bloat.
2. The “Magic” of IV Calcium: For cows in Stage 2 or 3, we typically administer calcium gluconate intravenously. It is one of the most rewarding treatments in veterinary medicine – often, a cow that looked near death will be up and grazing within 30 minutes of the drip starting.
3. Oral Supplements: For standing cows or as a follow-up to an IV, oral calcium gels or boluses are excellent for providing a sustained release of calcium.

A Note on DIY Treatment: While many ranchers keep calcium bottles on hand, giving IV calcium too quickly can stop a cow’s heart. If you aren’t comfortable with the procedure, our field service team is always ready to head out to your ranch.

 Prevention Tips:

• Monitor Potassium: High potassium in your hay (common in Kootenay fields that have been heavily manured) is a major trigger for Milk Fever.
• Body Condition: Keep an eye on her weight. Over-conditioned (fat) cows are at a much higher risk.
• Magnesium is Key: Without enough magnesium, a cow’s body physically cannot move calcium around. Ensure your mineral program is balanced for the Kootenays.