• 10 POUND • Equitrol pellets in horses feed prevent development of stable and house flies in the manure of treated horses. • In order to achieve optimum fly control, equitrol should be used in conjunction with other good management and sanitation pr. • Feed the recommended dosage to each horse separately to make certain he receives his full portion. • Start feeding equitrol early in the spring before flies begin to appear and continue feeding throughout the summer and into .