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How to get the best results from copper sulphate in footbaths

Chip Hendrickson for Progressive Dairy Published on 01 November 2021
Footbath

With a hoof care career that has spanned over 40 years, you could say I have seen a thing or two when it comes to hoof health products. This is especially true in the last 20 years as foot hygiene has become a critical success factor for many dairy operations.

Within the footbath, copper sulphate has been a popular commodity product that has set the standard by which other products are measured. It continues to be the workhorse of many footbath programs and is now available in a variety of products.

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Why copper sulphate?

Commercially available copper sulphate is typically sold in 25-kilogram bags as copper sulphate pentahydrate, which consists of approximately 25.5% copper and 38.5% sulphate. As a widely available commodity, prices tend to be consistent across multiple retailers. Its antimicrobial properties have been known for centuries. With respect to hoof hygiene, copper sulphate excels at dealing with hoof rot and is useful in prevention of digital dermatitis when used at higher concentrations. It is also capable of improving hoof hardness, which is critical in modern dairies.

When used in a footbath, copper sulphate powder must be mixed with water; otherwise, it can remain as large undissolved clumps at the bottom of the footbath, where it won’t help hooves. The need to mix can preclude its use in an automated footbath system. Copper sulphate is also prone to rapid deactivation when copper ions combine with ions from manure, urine and other organics in the water. Lastly, the price of copper sulphate is currently at an all-time high due to the rebounding economy and other economic forces.

Branded hoof care products that contain copper sulphate in liquid form have been developed to address some of the issues inherent to copper sulphate powder. For instance, they can be used in automated footbath systems, they easily mix in water, and they can be formulated with additives to make copper sulphate more efficient. However, it can be difficult to assess the effectiveness unless the buyer knows the percentage of copper sulphate in the product and the usage rate in the footbath. Ultimately, copper sulphate concentration in the footbath is the best predictor of results. The more copper sulphate you have in the footbath, the greater its antimicrobial capability and the better job it can do coating the tubulars of the hoof horn to reduce moisture and improve hoof hardness.

How concentrated is your copper sulphate?

The concentration of copper sulphate is also the greatest driver of product cost. Concentrations of 5% to as high as 20% by weight can be found on the market. A product with 5% copper should usually cost less than a product with more copper. Knowing the density of the product, you can determine the pounds of copper per gallon (or kilograms of copper per litre) of product. For instance, if the density of the product is 10 pounds per gallon (1.2 kilograms per litre) and the label says it contains 20% copper sulphate, then you will have 2 pounds of copper sulphate per gallon (0.2 kilograms per litre) of product. You can always ask the manufacturer for the product density and percent copper sulphate if not listed on the label.

The next factor in determining copper concentration is the usage rate, which is usually expressed as a percentage of the total volume (percent v/V) or gallon of product per gallon of water (g/G). The concentration of copper sulphate in the footbath is a function of the amount of copper sulphate in the product and the usage rate. For instance, if a product contains 2 pounds (0.9 kilograms) of copper sulphate and has a usage rate of 10% v/V (or 5 gallons per 50 gallons), then you would have a total of 10 pounds (4.5 kilograms) of copper sulphate in your footbath.

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Understanding copper concentration in the footbath can help you to evaluate various products because it directly relates to the product’s potential to be effective. This information can also be helpful when evaluating the relative cost. By determining the cost per pound or per kilogram of copper sulphate in the footbath, you will have a tool for comparison of different product offerings.

So how much copper do you need in the bath?

The answer depends on several factors, including time of year, hoof hygiene and the problem you are trying to counter. If you have dirty hooves or heavy soil load in your bath, you may need to run a bath with 10 to 15 pounds (4.5 to 6.8 kilograms) of copper, as soil loading can neutralize the copper ions. If you have very clean hooves and the soil load is manageable, you may be able to have success with 5 to 10 pounds (2.3 to 4.5 kilograms).

To counter dirty hooves and organic loading, some products include a surfactant to aid in removal of caked-on dirt and manure. Some products also include additives to make copper sulphate last longer. These additives slow the rate at which copper’s ions are neutralized by organic matter like urine and manure, which are released into the bath. Therefore, less copper can work longer before a footbath change is needed. While these additives contribute to the product cost, copper sulphate comprises most of the cost.  end mark

PHOTO: Copper sulphate concentration is the key factor that determines a footbath’s results. Courtesy photo.

Chip Hendrickson
  • Chip Hendrickson

  • Hoof Care Specialist
  • AgroChem Inc.
  • Email Chip Hendrickson

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