The aim of this work was to evaluate the reproductive performance of sows from different parities after transcervical infusion of seminal plasma or oestrogen at onset of oestrus. Two hundred and eleven Camborough 22<FONT FACE=Symbol>â</FONT> sows were used and classified according to the parity. Oestrus detection was performed twice daily after weaning in the presence of a mature boar. The ovulation was detected with a transcutaneous ultrasonography. At onset of oestrus the sows were randomly infused with seminal plasma, oestrogen or not infused (control group). All the females were inseminated in a maximum of three times into 8 and 16 hours intervals. In the control group first parity females ovulated earlier than second or higher parity females (P<0.05). Treatments did not influence neither oestrus length nor ovulation time. Litter size was not different among treatments.
Swine; seminal plasma; oestrogen; oestrus; ovulation
