Effect of virginiamycin on some physiological characters in Fayoumi pullets

A total of 350 female Fayoumi pullets 7 weeks of age was fed 20 and 30 ppm of virginiamycin during the growth and laying period, respectively, to study the effect of virginiamycin on growth rate, weight gain, development of the reproductive organs, thyroid gland weight age of sexual maturity and egg production. Virginiamycin significantly increased the growth rate and weight gain as well as it increased the development of reproductive organs; while it did not affect the development of thyroid gland. The experimental group reached the age of sexual maturity one day earlier than control group. Virginiamycin significantly increases egg production, egg weight and egg quality