Effects of oxytocin and prostaglandin F2α hormones on reproductive performance of Arabian rams

Oxytocin and prostaglandin F2α are effective on male reproductive function.
This experiment was carried out to evaluate the effects of oxytocin and prostaglandin F2α injection on reproductive activity of Arabian rams.
In breeding season, twelve Arabian rams with the nearly same age )average 2.5 years old), weight (average 64 Kg) and similar feeding conditions were assigned as a completely randomized design into three treatments: 1- control (without hormone injection), 2- oxytocin injection (7 IU, IV) and 3- PGF2α injection (4 mg dinoprost, IM). About 15 minutes after each injection, semen (with ejaculator) and blood samples were taken. Testicular circumference and height were measured. The time interval between the beginning of electrical stimulation to ejaculation was recorded. This experiment was repeated weekly for 4 weeks (16 observations for each treatment). The testosterone concentration in seminal and blood plasma was determined using radioimmunoassay.
The testis dimensions were not affected by treatments. The time interval stimulation to ejaculation in hormonal treatments was higher than control (P In general, the oxytocin and prostaglandin F2α injection to Arabian ram in breeding season, reduced the time interval stimulation to ejaculation and improved the most quantity and quality parameters of spermatozoa.