Identification of cattle using roller lickers

Abstract

Two observations were conducted to determine the suitability of 'Evan's Blue' soluble dye added to a molasses-urea supplement and a paint raddle built around a roller-licker for identifying animals taking supplement. Dye at a concentration of 5 % (w / v) in the supplement effectively marked the face, jaw and muzzle region of light-coloured animals for 2 to 4 days. However, dye staining could be seen on black animals only on a close inspection. A bluish-green stain was present in the faeces of animals consuming the supplement. The paint raddle marked animals on the neck and brisket areas and paint marks were clearly visible for 5 to 7 days.