PMID: 11325182Apr 28, 2001Paper

Administration of p.g. 600 to sows at weaning and the time of ovulation as determined by transrectal ultrasound

Journal of Animal Science
R V KnoxJ A Robb

Abstract

This study determined whether the interval from estrus to ovulation was altered by giving P.G. 600 to sows at weaning. Mixed-parity sows received P.G. 600 i.m. (n = 72) or no treatment (n = 65) at weaning (d 0). Beginning on d 0, sows were observed for estrus twice daily. At the onset of estrus and thereafter, ultrasound was performed twice daily to determine the average size of the largest follicles and time of ovulation. Weaning age (20.1+/-0.4 d) did not differ (P > 0.10) between treatments. More P.G. 600 sows expressed estrus within 8 d (P < 0.01) than controls (94.4% vs 78.4%, respectively). Parity was associated with expression of estrus (P < 0.02), with 78% of first-parity and 93% of later-parity sows exhibiting estrus. However, no treatment x parity effect was observed (P > 0.10). The interval from weaning to estrus was reduced (P < 0.0001) by P.G. 600 compared with controls (3.8+/-0.1 d vs 4.9+/-0.1 d). Follicle size at estrus was not affected by treatment (P > 0.10). The percentage of sows that ovulated did not differ (P > 0.10) for P.G. 600 and control sows (90.3% vs 81.5%, respectively). Time of ovulation after estrus was not affected by treatment and averaged 44.8 h. However, univariate analysis indicated that the ...Continue Reading

Citations

Jul 16, 2015·Reproduction in Domestic Animals = Zuchthygiene·R N Kirkwood, J Kauffold
Oct 4, 2016·Reproduction in Domestic Animals = Zuchthygiene·E BaroncelloF P Bortolozzo
Jun 16, 2005·Journal of Animal Science·B R HorsleyJ W Knight
Apr 4, 2015·Journal of Animal Science and Biotechnology·Robert R Kraeling, Stephen K Webel
Dec 21, 2019·Animal : an International Journal of Animal Bioscience·Z WangL Q Wang

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