Your horse tested positive for the P4 variant -- now what?
 
This 6-page starter diet template was created by Stephanie Carter, FNTP, IHP, author of Managing Muscle Mayhem and Equine Functional Nutrition, to help you take the first step toward supporting your P4 horse through species-appropriate, functional nutrition.
 
The P4 variant affects Myozenin 3, a protein that functions as the master communications coordinator in your horse's muscle cells. When this system is disrupted, individual muscle systems can still function but cannot coordinate their activities or receive clear instructions. P4 horses often appear normal at rest but struggle with coordination, training adaptation, and consistent performance. Inconsistent good days and bad days are the hallmark of this variant, and it is not a training issue. This template addresses those root causes through targeted nutritional support designed specifically for the P4 variant.
 
What's included:
Plain-language explanation of what the P4 variant does and why these horses struggle with coordination and training adaptation
Key dietary principles specific to P4
Twice-daily feeding chart with serving ranges based on an 1,100 lb horse (scalable by body weight)
Region-specific product recommendations for the US, Canada, UK/Ireland, EU, and Australia/NZ
4-week transition schedule for safe diet changeover
Label-reading quick reference to identify ingredients to avoid
Important transition notes including detox expectations, competition considerations, and why P4 horses show inconsistent performance
 
This template is designed for single-variant P4 horses. If your horse carries multiple variants, has metabolic challenges, or is not responding after 8-12 weeks, a personalized nutrition consultation is recommended at stephaniecarterntp.com.
 
This is a digital download (PDF). No refunds on digital products.
 
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