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.
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
Résultats: Pour les truies multipares saillies aux jours 4 et 6 après le sevrage, le nombre total de porcs nés était plus grand
dans le groupe LUT que dans le groupe
CONT (12.88 et 11.80, respectivement,
P < .01), alors que le taux de mise-bas