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 native chicken and relationships to Mareks' disease by measuring many parameters weekly such as Body weight , Lesion signs and Mortality rate .in this study was carried out on 120 chick one day old which reared on a litter until the end of experiment 28 wks'.in the 12 wks'old, blood samples have taken directly from heart and blood serum was isolated . Transferrin types were isolated by gel electrophoresis technique , three types of transferrin were identified and value A= 48 , AB= 32 , B=40 . The chicks were divided in such type as random to two groups , First is control and the second is Treated , and divide into subgroups 15 chicks . The treated subgroups were infected with the Mareks' disease virus ( MDVs) suspension at 14 wks' of age . The usual clinical signs and the postmortem signs which associated with Mareks' disease were noticed 4wks' after the artificial infection . The results explained that , there were significant differences at Level P< 0.05 of the mean of body weight , Lesion signs and Mortality rate between control and treated groups , there was also significant differences in means at the same Level in treated subgroups especially type A with AB, B. This study was explained that a different in resistance against Mareks' disease between types of Transferrin, but (Homozygosity) type A gave the best result' when compared with another types of Transferrin in case of selection and resistance against disease in native chicken.