J. Anim Sci.
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J. Anim Sci. 1977. 44:1-7.
© 1977 American Society of Animal Science
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Late Gestation Feeding of Dichlorvos: The Response in Artificially and Dam-Reared Litters

D. G. Siers1, D. M. Danielson2, E. Y. Chai1 and H. H. Keasling1

Shell Development Company, Modesto, CA 95352 and and University of Nebraska, North Platte Station, North Platte 69101

Abstract

Litter characteristics from birth to weaning were evaluated in 123 litters from dams of three parity groups. Within each parity group litters were either reared by the dam or artificially reared. Within each rearing group the dams received either 0 or .0022 lb (1 g)/dam/day of dichlorvos as a topdress on the daily gestation diet during the last 30 days of gestation. Litters reared on dams had significantly (P<.01) heavier litter weights and mean pig weights at 7, 14 and 21 days of age when compared to the artificially reared litters. The dichlorvos treatment increased 14 day litter weights and mean pig weights at 14 and 21 days. There was a significant (P<.01) interaction of type of rearing with dichlorvos treatment for the number of live pigs per litter at 7 days of age. In general, the dichlorvos treatment effect was greater in the artificially reared litters than in the dam-reared litters. Parity significantly (P<.05) influenced total pigs born per litter, number born live and litter weight at 7, 14 and 21 days of age. There was a significant (P<.01) interaction of parity with type of rearing for mean pig weight at 7 days, number of live pigs at 21 days and litter weight at 7, 14 and 21 days. The extent of the parity effects on these traits was reduced in the artificially reared litters as compared to the dam-reared litters.

Footnotes

1 Biological Sciences Research Center, Modesto, CA.

2 University of Nebraska, North Platte, NE.






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