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  • Title: Urogenital diseases and their effect on reproductive performance in high-parity sows.
    Author: Sanders LM, Bilkei G.
    Journal: Tijdschr Diergeneeskd; 2004 Feb 15; 129(4):108-12. PubMed ID: 15002205.
    Abstract:
    UNLABELLED: In a Slowakian indoor pig production unit (2423 sows), from June to December 2002 all culled sows with excessive vulval discharge at culling, and with vulval discharge and periparturient disease in their previous history were subjected to retrospective lifetime production analysis. The sows were assigned to nine groups according to parity (parity 1-9). Average total litter size, average live-born litter size, average stillbirth rate, average mummy rate, and average litter weaning weight were evaluated retrospectively for all births. Non-culled sows represented the control animals. The percentage of animals with periparturient disease and vulval discharge in their history differed between parities. Parity 2, 3, and 4 sows had a significantly lower percentage of vulval discharge and periparturient disease in their history than sows of other parities. Compared to parity 1-6 sows, parity 7-9 sows had significantly lower (P < .001) conception rates, farrowing rates, and adjusted farrowing rates. Compared to parity 1-2 and 7-9 sows, parity 3-6 sows had a significantly larger (P < .001) lifetime average total born and live-born litter size. Compared to parity 1-3 and 7-9 sows, parity 4-6 sows had a significantly lower (P < .001) rate of stillbirths over all parities. No differences in mummy rates were detected between the sows of different parities. Compared to parity 1-2 and 7-9 sows, parity 3-6 sows had significantly higher (P < .001) weaning litter weights over all parities. Sows without a history of vulval discharge and periparturient disease had higher (P < .001) production levels in parity 7-9. IMPLICATIONS: The present results indicate that parity markedly influences the production level of sows that have a history of periparturient disease and vulval discharge.
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