STUDY OF RELATIONSHIPS OF THE TRANSFERRIN TYPE TO RESISTANCE AGAINST MAREKS DISEASE IN NATIVE CHICKEN.

Abstract

This study was conducted to identify transferrin types in blood nativechicken and relationships to Mareks' disease by measuring many parametersweekly such as Body weight , Lesion signs and Mortality rate .in this study wascarried out on 120 chick one day old which reared on a litter until the end ofexperiment 28 wks'.in the 12 wks'old, blood samples have taken directly fromheart and blood serum was isolated . Transferrin types were isolated by gelelectrophoresis technique , three types of transferrin were identified and valueA= 48 , AB= 32 , B=40 . The chicks were divided in such type as random totwo groups , First is control and the second is Treated , and divide intosubgroups 15 chicks . The treated subgroups were infected with the Mareks'disease virus ( MDVs) suspension at 14 wks' of age . The usual clinical signsand the postmortem signs which associated with Mareks' disease were noticed4wks' after the artificial infection . The results explained that , there were significant differences at Level (P< 0.05) of the mean of body weight , Lesionsigns and Mortality rate between control and treated groups , there was alsosignificant differences in means at the same Level in treated subgroupsespecially type A with AB, B. This study was explained that a different inresistance against Mareks' disease between types of Transferrin, but(Homozygosity) type A gave the best result' when compared with another typesof Transferrin in case of selection and resistance against disease in nativechicken.