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Complete endogenous RNA tumour virus production by inbred and non-inbred chickens
L B Crittenden1, J S Gavora, F A Gulvas
1U.S. Department of Agriculture, Science and Education Administration, Federal Research, Regional Poultry Research Laboratory, East Lansing, Michigan 48823, USA.
Abstract:
Nine- to 11-day embryos of five outbred and 12 inbred stocks were assayed for complete endogenous subgroup E virus. About one-third of the embryos produced a subgroup E virus. The percent virus production was higher in the inbred than in the outbred embryos, but wide variation among the inbred lines suggested that this was a chance phenomenon and probably not due to inbreeding per se. There was a reduced incidence of subgroup E virus production in the strains selected for economic traits when compared with the incidence in the corresponding random-bred control stocks. Further experimental work is required to determine if this trend is a real and not a chance phenomenon.
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