on Reproductive Performance of New Zealand White Rabbit Bucks

An experiment was carried out to investigate the hormonal effect of GA on sexual system and 3 reproductive performance of adult male rabbits. Twenty-male New Zealand white rabbits at 7-months old were randomly divided into equal 4 groups. Groups 2, 3 and 4 were injected subcutaneously (under nick skin) with 200, 400 and 800 μg GA /kg B.W./week for 6 weeks treated period, while group 1 was served as a control group. 3 Male rabbits treated with GA at all studied doses caused a significant increase in semen ejaculate volume (EV), 3 sperm concentration (SCon), total sperm out-put (TSO) and sperm motility (%) compared to the control group. The medium dose (400 μg GA /kg B.W./week) had the best effect for the most of the pervious semen 3 characteristics compared to low and high doses. Furthermore, GA increased libido (decrease reaction time RT), 3 normal sperm and live sperm significantly compared with the control group, while, dead sperm was decreased. There were an increase in seminal plasma total lipids and total protein in the treated groups while, urea concentration was decreased. GA administration caused a decrease in alanine aminotransferase (ALT) and 3 aspartate aminotransferase (AST) Enzymes activities in seminal plasma for treated groups but Alkaline phosphatase (ALP) and acid phosphatase (AcP) enzymes activities were increased. Treated male rabbits with GA doses resulted in a gradual and significant decrease in serum testosterone concentration compared to the 3 control group.