Tired of messy sprays, rubs and dusters? Don't want to stress pregnant cattle by running through chutes to implant fly tags and then remove each fall? The STOCKADE? Rabon? fly control block is for you. Effectively control horn, stable, face and house flies in the manure of treated cattle and horses with these self-fed blocks. Rabon? safely passes through the digestive system to become active in the manure pat. Because of this, Rabon? requires no slaughter or milk withdrawal in cattle. Just follow label directions and place these blocks out 30 days prior to expected fly build-up (March or April in most of the US) and continue feeding until the first killing frost for effective control. Because these blocks contain a full mineral/vitamin package, no additional supplements or salt are needed or recommended.