In llamas, artificial insemination trials with fresh and
frozen–thawed semen have been reported with pregnancy
rates of 21.7% with fresh and 7.9% with frozen–thawed
semen (Aller et al., 1997). Currently, trials of AI in alpacas
and llamas in Peru consistently yield a birthing rate of
50% following a single insemination with fresh extended
semen. It should be pointed out that a pregnancy rate
of 50% is common in other species, especially considering
that alpacas are inseminated once (Bravo et al.,
1997b). Recently, a single trial of repeated insemination
in alpacas with fresh semen has been reported
(Torres, 2006). In this last case, the first insemination
yielded 50% of females pregnant; however, fertility
increased to 67% after 3 inseminations in females of
those not becoming pregnant after the first and second
time.