Genetic Differences among Chicken Embryos in Response to Inoculation with an Isolate of Infectious Bronchitis Virus

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Abstract
Passage of the virus in the allantoic sac of embryonating eggs increased the pathogenicity for line 7 embryos significantly, but the pathogenicity for line 6 embryos remained unchanged. Line 7 embryos died significantly later than line 6 embryos when infected with RPL-IBV [Regional Poultry Laboratory infectious bronchitis virus]. Line 151 was intermediate between these 2. The difference between reciprocal crosses was significant at 7 days postinoculation. The effect of the line 7 male on delaying mortality was greater than that of the female. This may be due to one or more sex-linked genes for delaying mortality in line 7 or to a meternal effect in line 7 females causing earlier mortality. Some matings of inbred lines had significantly more or less mortality than would be expected from consideration of the specific mortality among the lines themselves. After evaluating all evidence available, it is felt that genetic influence was more important in delaying mortality than the effect of passive maternal antibody.