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The current study aimed to reduce the toxic effect of different mycotoxins and enhance the immunity against ND virus in broiler chickens by using lymphokines from hyperimmunized birds with Salmonella typhymurium. The study included three stages, the first stage included isolating Salmonella typhymurium. The second stage was immunized chicks with Salmonella typhymurium. The final stage of the study was accomplished by treating 250 broiler chicks (divided into 5 groups, 50 chicks /each) with the following treatments; G1: 0.5 ml lymphokines was injected I/P at day one old with live ND vaccine (la Sota strain) after 30 minutes in drinking water, the process repeated after 10 days; G2: the same as in G1 but inactivated killed vaccine was used s/c,no repetition was carried out at 10 days ; G3: a combination of G1 and G2 with revaccination of live La Sota vaccines only at 10 days; G4 : only vaccinated with live La Sota vaccine repeated at 10 days; G5: no treatments (negative control). All groups were challenge with local isolate of NDV (100ELD50 10) at 25 days, all groups except the fifth group were fed on contaminated diet with mycotoxin. The results of the present study showed a significant increase (P <0.05) in antibodies titre against ND in the third group, followed by the first and second groups Measured by ELISA and hemagglutination (HI) test, A significant decrease (P >0.05) in the oxidation status (H2O2, MDA and LPO) and significant increase in the antioxidant defense (GSH-PX) in the liver and spleen samples. We conclude from the current study that the Salmonella immune lymphokines (SIL) helps in enhancement the level of immunity against Newcastle disease and n reduction the side effects of which mycotoxin.

al-mağallaẗ al-ʻirāqiyyaẗ li-l-ʻulūm al-bayṭariyyaẗ/iraqi journal of veterinary sciences

Using T cell lymphokines to enhance the immune response against Newcastle disease in vaccinated broiler chickens fed naturally contaminated diet with different mycotoxins