Nutritious livestock licking bricks is a salt product made with salt as the carrier and the addition of various minerals and trace elements by die forming with 150Mpa/m2 pressure.Livestocks daily free lick can obtain all-inclusive minerals and trace elements.This is what the daily feed cannot provide.Nutritious salt lick can stand the wind,the sun and the rain for its highdensity and hardness.It is so hard that livestock cannot crunch.Therefore,licking volume can be controlled effectively.It not only ensures the intake of minerals and trace elements that livestock require,but also incurs no waste and requires no artificial control.It is truly such a free lick that farmers can use it at ease without any professional knowledge..Experiments have proved that nutritious salt lick of relatively complete minerals can effectively improve milk production,multiplication rate,immunity;promote digestion and absorption,multiplication rate,immunity;promote digestion and absorption and improve feed utilization efficiency.