Teat spray is one of those inputs that many farmers choose once and rarely revisit, which means a lot of herds are running with a product that was never matched to their system in the first place.
Deosan has been supplying teat care products to NZ dairy farmers for decades. That experience has shaped a product range built specifically around the conditions NZ farmers actually work in: high rainfall, pasture-based systems, cold mornings, and muddy yards. This guide walks through the key decisions so you can match the right Deosan product to your herd, your infrastructure, and your season.
The three types of teat spray and when each is appropriate
Post-milking teat spray is the most important intervention in any teat health programme. Applied immediately after cup removal, it targets bacteria on and around the teat end during the period of maximum vulnerability, when the teat canal is still partially open. Every dairy farm in New Zealand should be running a post-milking spray or dip programme, every milking, without exception.
Deosan TEATX is the benchmark post-milking product for NZ conditions. Developed in the early 1990s specifically for pasture-based dairying, TEATX uses an iodine-based active calibrated for effective kill rates in cold and wet conditions, without the teat skin damage that high-concentration iodine products can cause over a season. If you are running one product, TEATX is where to start.
Pre-milking teat spray is used in systems where teat preparation before cup attachment is part of the milking routine. It is more common in larger herds or farms where teat contamination is higher. It reduces bacterial load before milking, lowering the risk of contamination being drawn into the udder during the milking process.
Barrier teat spray adds a physical film over the teat end between milkings. It is most useful in high-challenge environments during extended wet periods, in autumn as cows approach dry-off, or for individual cows identified with teat end damage. Barrier spray is a supplement to the post-milking programme, not a replacement for it.
Spray vs dipping: coverage and efficacy
Both methods can deliver consistent results. The difference is in execution.
Dipping; immersing the teat in a cup containing Deosan iodine teat dip provides reliable, measurable coverage when held correctly. The solution needs to make full contact from the teat end up to the attachment point. Cups must be cleaned regularly to prevent cross-contamination between cows; a dirty dip cup is a transmission risk, not a protection.
Spray application with TEATX is faster in most rotary systems but more variable in practice. Coverage depends on nozzle type, spray pressure, distance, and angle. Undertrained staff or rushed milkings are more likely to result in incomplete coverage with spray than with dipping. If you are running a spray programme, a periodic dye test to check coverage is worth doing at least once a season.
When to use a barrier spray vs standard post-milking spray
Deosan barrier teat spray is designed for situations where standard post-milking spray needs support. The barrier film it creates over the teat end adds a layer of physical protection between milkings, particularly useful when environmental contamination is high.
The situations where adding barrier spray is most likely to add value: during the four weeks before dry-off, when teat end vulnerability increases and environmental challenge often rises simultaneously; during extended wet periods when cows are spending more time in contaminated conditions; and for individual cows flagged with teat end damage or hyperkeratosis - the rough, raised ring at the teat end that signals elevated infection risk.
Barrier spray is most effective when used alongside TEATX as part of a structured programme, not as a standalone product or a seasonal switch. Talk to your Deosan territory manager about which cows and which periods make the most sense for your system.
The link between teat spray and SCC outcomes
Your SCC data is the most reliable measure of how well your teat spray programme is performing. A well-run Deosan programme; TEATX, TEATX Plus or iodine teat dip applied consistently, with barrier spray used at key risk periods - should be contributing to SCC below 150,000 cells/mL. Farms consistently above 200,000 are losing processor income and often don't realise the programme is the place to look first.
The most common issues Deosan's field team finds when investigating elevated SCC: product concentration that has drifted (particularly with concentrate products mixed on-farm), spray or dip equipment that hasn't been serviced, and application that has become inconsistent as seasons progress and staff change.
Teats treated with Deosan TEATX Post-Milking Teat Spray across the full 2025/26 dairy season.
How to trial a new product properly
If you are considering switching products, don't change everything at once. Trial the new product for a full six-week period on your herd, monitor teat end condition weekly, and track SCC at the next pickup. If teat condition holds and SCC stays stable or improves, the product is working for your system. If either moves in the wrong direction, the product isn't the right match, regardless of the price.
Six weeks is the minimum for a meaningful trial. Anything shorter and you're making decisions based on noise, not signal. A Deosan territory manager can help you design a structured comparison if you want to evaluate your current programme against an alternative.
