This experiment compared effect of atropine 0.25 mg/kg between before and after injection in eight male
goats. The trial was conducted for 3 experiments in 3 consecutive weeks. At the first week, all male goats were
injected intramuscularly with normal saline 1 ml (NSS) as a pre-control group. At the second week, all goats
were injected with atropine 0.25 mg/kg as an atropine group. At the third week, all goats were injected with NSS
as a post-control group. Pupillary light reflex and heart rate were evaluated 15 minutes before and after
injection. Sexual desire was evaluated by libido score. Semen was collected within 40 minutes after injection
for assessing semen quality and seminal fluid volume. In atropine group, all goats had mydriasis and
significantly higher heart rate after injection. All groups could copulate and ejaculate within 1 minute after
contacting the female. Sexual desire, semen parameters and seminal fluid volume were not significantly different
among three groups. In summary, injecting atropine 0.25 mg/kg inhibited parasympathetic nervous system and
did not change sexual desire, semen quality and seminal fluid volume.
Keywords
atropine, sexual desire, semen quality, seminal fluid, goat