We tested the hypothesis that prostaglandin-F2 alpha (PGF2 alpha ) enhances sexual behaviour in boars with suppressed testosterone and estradiol secretion. After semen collection at week 0, boars received an s.c. implant containing a gonadotropin-releasing hormone agonist (GnRHa) or were sham-implanted. Beginning at week 1, GnRHa-implanted boars received i.m. treatment with 10 mg PGF2 alpha (n=5) or vehicle (n=5) upon entering the semen collection room. Sham-implanted boars (n=5) received i.m. vehicle. Blood was sampled and sexual behaviour assessed at weeks 0 and 5. Compared to sham-implanted boars and GnRHa-implanted boars receiving PGF2 alpha , serum concentrations of testosterone and estradiol were lower in GnRHa-implanted boars receiving saline (P<0.05). The number of boars ejaculating, time from entering collection room to the first attempt to mount the artificial sow, time from entering to the start of ejaculation, and duration of ejaculation did not differ among treatments (P>0.05). The number of false mounts (mounting artificial sow but dismounting prior to semen collection) was increased (P<0.05) by GnRHa implants, an effect reversed (P<0.05) by PGF2 alpha . The data indicates that acutely suppressing concentrations of testosterone and estradiol will not abolish sexual behaviour in boars, but leads to an increase in the number of unsuccessful mounts of an artificial sow. The number of false mounts can be decreased by treatment with PGF2 alpha .
|Publication Title||Applied Animal Behaviour Science|
|Author Address||Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA. firstname.lastname@example.org|
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