J. Anim Sci.
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J. Anim Sci. 1979. 48:45-51.
© 1979 American Society of Animal Science
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Effect of Late Gestation Feeding of Dichlorvos in Non-Parasitized and Parasitized Sows1

R. Young, Jr., D. K. Hass and L. J. Brown

Shell Development Company, Modesto CA 953522

Abstract

Eighty-two crossbred sows either non-parasitized, naturally infected with Ascaris suum, or artificially exposed to Oesophagostomum dentatum were used to study the joint effects of dichlorvos treatment and parasitism upon reproductive performance. Each treated sow was given dichlorvos3 (4 mg/kg b.w./day) from gestation day 80 until parturition. Statistical evaluation was based upon numbers born alive, birth weight, survival to weaning and weaning weight of the piglets.

The worm expulsion with subsequent reduction in fecal egg counts was virtually complete 4 days after dichlorvos therapy began.

There were no dichlorvos x parasitism interactions to indicate a lack of response in parasite-free sows. Overall, the beneficial dichlorvos responses were essentially the same in parasite-free and parasite-infected sows. Parasitism did not affect the number of piglets born alive, but sows treated with dichlorvos produced .5 more live pigs (P<.05). The mean birth weight of piglets from dichlorvos-treated sows was .06 kg heavier than that of the controls (P<.01), while the litter birth weight was 1.3 kg heavier (P<.01).

Individual pig weaning weight was not markedly affected by parasite infection of the dam. Treating the sows with dichlorvos increased the mean piglet weaning weight .5 kg over that of the controls (P<.05). Dichlorvos-treated sows weaned litters 9.1 kg heavier than controls (P<.01). Surprisingly, Oesophagostomum infection of sows appeared to increase litter weaning weight 4.7 kg.

Footnotes

1 The able technical assistance rendered by D. B. Holtzclaw, C. J. Jelatis, J. I. Llamas, V. A. Molina, W. M. Olson, J. E. Sharp and S. R. Wagoner is gratefully acknowledged.

2 Biological Sciences Research Center, P. O. Box 4248, Modesto, CA 95352.






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Copyright © 1979 by the American Society of Animal Science.