A total of 32 ROSS 308 male broiler breeders (60 weeks of age) were induced
to molt and then were randomly distributed into four groups: group 1 (control) without
any injection, group 2 subjected to intramuscular of 0.1 mL/kg body weight of vitamin Eselenium,
group 3 subjected to intramuscular of 0.3 mL. Receptal solution as a GnRHa
and group IV subjected to intramuscular both of vitamin E-selenium and GnRHa.