il livestock tail paint crayons is used to detect the real heat of cow, so that the veterians or farmers can carry out the insemination promptly.

il livestock tail paint crayons made of special formala, it is smooth on the tail of cow when in cold temperature, but will become wrinkle when the temperature on the tail of cow become heat, then the veterians or farmer will know which cows are in real heat or oestrus, and then carry out the insemination promply, this will obviously improve the insemination sucess.