Objective: To determine reproductive
performance of weaned sows inseminated
twice at fixed times after controlling time
of ovulation with porcine luteinizing
hormone administered at onset of
behavioral estrus.
Materials and methods: Multiparous
sows were randomly assigned to treatment
at weaning. From weaning, twice-daily
boar exposure facilitated estrus detection.
Untreated control sows (n = 150; CONT)
were artificially inseminated at least twice.
Treated sows (n = 168; LUT) received 5 mg
pLH intramuscularly concomitant with the
first detection of standing heat. To coincide
with the normal working day, sows in estrus