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Efficacy of In-Ovo Vaccination against Marek's Disease in Commercial Broiler  

Um, H.J. (College of Veterinary Medicine and Research Institute of Veterinary, Chungbuk National University)
Won, M.Y. (College of Veterinary Medicine and Research Institute of Veterinary, Chungbuk National University)
Lee, D.W. (Medicine, Merial Korea)
Go, D.W. (CherryBro Co. Ltd.)
Mo, I.P. (College of Veterinary Medicine and Research Institute of Veterinary, Chungbuk National University)
Publication Information
Korean Journal of Poultry Science / v.33, no.4, 2006 , pp. 295-301 More about this Journal
Abstract
This study has been designed to evaluate the efficacy of MD in-ovo vaccination in broiler and to find the contamination level of MD virus in broiler farms. A nested PCR test was used to find the level of filed contamination of pathogenic MD virus in the commercial broiler farms. The positive rate of farms contaminated with pathogenic MD virus was 26.09%. And to evaluate the efficacy of MD vaccination, performance factors such as the mortality, feed conversion rate and body weight at market age has been recorded and compared among farms. There was no difference on these factors between vaccinated and non-vaccinated farms except performance. We need further investigation of the film with low performance index. The B/B ratio, which is common index for the evaluation of bursal changes, was calculated and compared between vaccinated and non-vaccinated group There were significant decreases of B/B ratio in the both group without any statistical difference between groups. The reason of decreased bursal size may be due to other infection such as IBD. From this study, we can know that the contamination rate of fm with pathogenic MD virus was very low and not different from previous study. However, the difference of the contamination rate in different locations recommends periodical monitoring on these areas.
Keywords
In-ovo; Marek's disease; broiler; vaccination;
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