Genetics of resistance to @entity7843 : response of inbred XXXX lines to infection by @entity12917 and Eimeria maxima.

@entity353 @entity7843 @entity12917 @entity1573 @entity1017 @entity10803
1. Experiments have been carried out to compare @entity1017 , mortality and oocyst production in 7 inbred and partially inbred lines of @entity1573 after challenge with the coccidial parasites @entity12917 and E. maxima. 2. There were large differences between lines in the effects of challenge on @entity1017 and mortality for both species of parasite. However, the lines suffering the greatest mortality were not those showing the greatest effects on @entity1017 , indicating that mortality alone is not an adequate criterion in selection for resistance. 3. Although oocyst production differed between lines there was no correlation with mortality or with @entity353 , implying that the variation observed in these traits was not due to a restriction of the parasite but to an accommodation of its effects. 4. Mortality and @entity353 resulting from challenge with @entity12917 in the different lines did not correlate with that caused by E. maxima. 5. There was evidence of an association of genes of the major histocompatibility complex genes with mortality, but not with @entity353 or oocyst production: there was no indication of association of resistance to @entity7843 with resistance to @entity10803 .
