The Thai Journal of Veterinary Medicine


The present study was conducted to investigate the effect of exogenous prostaglandin F2 alpha (PGF2α) administration on weaning-to-service interval (WSI) in primiparous sows. A total of 149 primiparous sows, 74 control and 75 treatment sows, were included in the study. The latter sows were intramuscularly injected with PGF2α approximately at 24-48 h after parturition. Results revealed that those treated with PGF2α returned to be in estrus significantly faster than those in the control group (2.6±1.1 vs 4.5±2.1 days, p<0.05), while age at first mating, pregnancy rate, and age at first farrowing were not different from each other. In conclusion, PGF2α could shorten WSI in the primiparous sows as it could induce complete luteolysis and promote uterine involution, resulting in declined non-productive days of the commercial breeding herds.

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