Effect of virginiamycin and zinc bacteracin on newcastle disease virus vaccinated broiler chicks
2005
Azhar, M.S.
The birds that received virginiamycin (stafac 500) at recommended dosage levels had higher body weight than the Zinc bacitracin medicated; Cyclophosphamide treated or untreated control birds. Both virginiamycin and Zinc bacitracin treatments did not adversely affect the weights of bursa of Fabricius, spleen, thymus and liver of birds. Cyclophosphamide treatment of birds in early life resulted in bursal atrophy and slight depression of spleenic weight gain. As compared to Cyclophosphamide treated and non-medicated control birds, the sera of NDV vaccinated birds fed virginiamycin/Zinc bacitracin had higher antibody titres on day 42. The post-challenge sera of NDV vaccinated birds fed virginiamycin and Zinc bacitracin also had higher antibody titre as compared to NDV vaccinated Cyclophosphamide treated birds. The NDV vaccinated birds on virginiamycin/Zinc bacitracin mediated rations and those on non-medicated rations did not have any significant post-challenge mortality.
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