چکیده (انگلیسی):

Objective: To investigate the effects of intramuscular injection of vitamin E-selenium
and a GnRH analogue (GnRHa) on reproductive performance and serum biochemical
parameters in post-molt male broiler breeders.
Methods: 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.
Results: The results showed that the egg hatchability and fertility percentages were
increased and the eggs infertility percentage declined significantly in groups 3 and 4
(P < 0.05). However, eggs and chicks weight was not affected by experimental treatments
(P > 0.05). The results of blood biochemical parameters indicated that serum glucose was
higher in group 3 which was injected with GnRHa (P < 0.05). The experimental treatments
did not alter hepatic enzymes activity including AST and ALT (P > 0.05). The
results showed that serum testosterone concentration was increased in groups 3 and 4
(P < 0.05). In addition, the serum concentration of T4 (tetraiodothyronie) was higher in
groups 3 and 4 (P < 0.05). However, the T3 (triiodothyronine) concentration was not
influenced by experimental treatments (P > 0.05).
Conclusions: It is concluded that reproductive performance and serum testosterone in
post-molt male broiler breeders were improved by treated with vitamin E-selenium and
GnRHa.