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The beginning of March brought a flurry of activity for the Minnesota Turkey Growers Association (MTGA) as spring Grower Education meetings kicked off. These gatherings serve as a vital touchpoint for our industry, providing a space for growers to connect, share experiences, and learn about the latest developments in turkey production. This year, we were pleased to welcome Dr. Brian Payne, DVM, with Veterinary Pharmaceutical Solutions, as our first presenter. His presentation, "Lessons Learned in Water Medication Usage," addressed a critical but often overlooked aspect of poultry health management: the effective delivery of water-soluble medications.
Dr. Payne’s message was clear: accurate dosing is not simplya matter of selecting the right product; it requires a deep understanding ofthe systems and processes used to deliver that medication to the birds. "Ihope that from this presentation you can walk away with two differentthings," Dr. Payne shared during the meeting. "Whether it isvaccination through the water, whether is disinfectant through the water, orwhether it's water-soluble medication through the water, that you can take alook and say am I doing the right thing?".
The effectiveness of any water-soluble medication starts with accurate calculations based on bird weight and water consumption. Without these two pieces of data, achieving the correct dose is nearly impossible. Dr. Payne emphasized that "if you're not weighing your birds, if you're not measuring how much water they're consuming, you're probably not doing accurate dosing".
In many cases, calculations are based on estimates or "guessed" weights, which adds significant variation to the dosing process. This variation can lead to two problematic outcomes: under-medication, which results in increased morbidity and mortality, or over-medication, which unnecessarily raises production costs and places undue pressure on bacterial resistance. To illustrate the impact of water intake variation, Dr. Payne presented a case study of a 9-week-old turkey flock. Over just three days, the flock's daily water consumption jumped from 640 gallons to 1,200 gallons. If a grower failed to adjust the stock solution to account for this 1.9-foldincrease in intake, the actual dose received by the birds would be significantly diluted.
Even with perfect calculations, the mechanical delivery system remains a primary source of error. Medicators are the workhorses of the barn, relied upon to deliver thousands of dollars worth of medications, vaccines, and nutrients. However, they are frequently less accurate than producers assume. Research shared by Dr. Payne indicated that 68% of medicators tested were outside the target range (typically 1:128), and of those, 75% were delivering solutions that were too diluted.
"Medicators are very and commonly inaccurate," Dr. Payne warned. To combat this, he urged growers to implement regular protocols for measuring medicator accuracy. Methods can range from comparing water meter readings to stock solution weight over time, to more precise techniques like spectrophotometry. By identifying units that are out of range, growers can repair or replace equipment before it impacts bird health or the bottom line.
The stability of a medication once it is mixed into a stock solution is another critical factor. Dr. Payne recommended that stock solutions be made fresh every 24 hours at a minimum, while certain products, such as penicillin, should be prepared every 12 hours to maintain potency. He also reminded growers never to add new solution on top of old batches.
The use of stir pumps to keep medications in suspension is common practice, but Dr. Payne cautioned that they are not always necessary and can sometimes be detrimental. While useful for products that do not achieve a true solution, stir pumps can generate significant heat. Some agitator pumps have been shown to increase stock solution temperature by 30°F to 40°F in just12 to 24 hours. This heat buildup can rapidly degrade temperature-sensitive medications like β-lactams (e.g., penicillin and amoxicillin).
In controlled tests, amoxicillin and meloxicam saw a 20% decrease in potency over 24 hours when used with a constant stir pump. "Stir pumps running continuously can accelerate degradation of temperature-sensitive medications," Dr. Payne noted. If a pump is necessary, he suggested using an outlet timer set in 15-minute increments to cycle the pump and minimize heat generation.
One of the most striking portions of the presentation focused on the impact of biofilms. These microbial layers adhere to the inside of water lines and can aggressively degrade medications before they ever reach the birds. Dr. Payne shared a sobering statistic: "85% of your drug was wasted because there was biofilm in [the line]". He explained that even in lines that appeared cleaner, potency could still drop by 30-40% due to the presence of these contaminants.
"Biofilms matter; they decrease the potency of this specific drug," Dr. Payne emphasized. Maintaining clean water lines is not just a sanitation task; it is a critical step in ensuring that the investment made in medication actually benefits the flock. His final advice was simple but powerful: "Keep it clean – it will protect your medications and prevent problems".
As we move into a busy spring season, the lessons from Dr. Payne provide a clear checklist for improving on-farm medication practices:
By focusing on these operational details, you can ensure your turkey flocks remain healthy and your management practices remain as effective as possible.
We thank Dr. Brian Payne for starting our regional meetingswith such a timely and actionable presentation.
