... production, and promote follicular development, increase egg production rate, maintenance of eggs nest, to extend the peak ... enhance Yolk color; 2 improve the avian fecundity, egg fertilization rate increased, hatching rate, hatching rate, etc.; 3 can increase ... refueling, immunity, hot and cold temperature resistance, and improve feed conversion rate; 4 the egg-layng poultry use during the incubation ...