ARS Says Exposure to Marek's Does Not Work Natural exposure as a strategy to protect young chickens against Marek’s disease (MD) just does not work. - In some poultry-growing areas it has become a common practice to put old 'litter with baby chicks under each brooder stove or to place a few old hens in with the Happy to help you SI X Frm Com - me*- /V®* • fiow-o/ o<uik /s bene And I(i n i '■+ To Help y on 4r]'r 1' r J - j]i i j * +1« hiore Hip - fy To Help m. Com - mow-wfIJH Na. • B^wfe chicks. It is usually hoped that this “controlled” exposure will reduce later outbreaks of MD, a tumorous disease.of chickens. The practice was tested toy ARS poultry scientists H. Graham Purchase, William Okazaki, and Ben R. Burmester at the Regional Poultry Research • • • To Help 7°**' V > . MV is here And ~ four* — lii-Hc viords sa y We cm fioM-aJ wdjjf Commonwealth National Bank A _ • kel/> you, fo-^ey fou,r )if -fie wor<ls a -Iwf Unfc- We planned if ftorf »«*( Lititz - Manheim Township - Millersville - Rohrerstown Lancaster - Centerville - Lancaster East * Landisville Laboratory, East Lansing, Mich., and Marius lanconescu, formerly with ARS. In two experiments litter was used for the exposure and, in one, a number of adult birds. Chicks were raised either on the farm or in isolation. Resis tance acquired from expdsure • • i • • //op- py To Help You. Ca,ns* its nic-€r to - day » • i iJJ fpi | IJ J j--] » J y 1 = 'Cat,s€ pte-fk vho swlc £ /'f • ••. . » * 9 was challenged with injections of Marek’s disease virus or contact exposure from chickens with Marek’s disease. The natu ral exposure should cause anti bodies to be produced. The chicks would thus develop resis tance and be protected from sub sequent infection. Words and Music by Steve Karmen © 1971 Sandlee Publ. Corp., Rockville Centre, L.L, N.Y, 11570 IJU1 J U JJ J ' C*,m- mon-wcaUk Ml - fi on -al - o<mk • • * » ( tv-’nj-fhn y Wn/e Ue f* say IN OiiK OUT* Vtoj my +hc Cow - Nd,- Lancaster Farming, Saturday, July 24,1971 Utf-pj Tp Help ioe l re i ♦ f~ htrt Results indicated that farm reared (exposed) birds were as prone to MD effects as chickens raised in isolation. “The presence of actively ac quired antibody does not confer any significant degree of protec tion against MD,” the scientists concluded. Since birds raised in isolation showed the same age effect, re duced susceptibility could not be attributed to natural exposure. 9
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