Keywords : Aggression
journal of kerbala university,
2013, Volume 9, Issue 2, Pages 1-6
A present study was carried out to investigate the effects of Estradiol benzoate on aggressive behavior in male calves through studying the testosterone and estrogen hormones. Twenty calves were randomly divided into two groups (ten in each group) and treated as follows: calves in the first group considered as control without treated, whereas the calves in the 2nd group were injected Estradiol benzoate (0.03 mg/Kg) subcutaneously on the first day of experiment and termed as estradiol treated group, blood samples were collected on day 14 and day 28 of the experiment for measuring the hormones. Results revealed a significant increase (P≤0.05) in testosterone hormone of estradiol treated group as compared with the control group at day 14, whereas testosterone significantly decreased (P≤0.05) in of estradiol treated group when compared with the control at day 28. Furthermore, within group there was a significant (P≤0.05) decrease in testosterone at day 28 as compared with day 14. Moreover, estrogen hormone significantly increased (P≤0.05) in the estradiol treated group at all periods of experiment when compared with the control group. On conclusion it seems likely that subcutaneous injection of calves with (0.03mg/Kg) of Estradiol benzoate caused obvious decrease of testosterone and consequently inhibition of aggression in calves.