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Jurajda V., O. Kavela: Occurrence of the Skin Form of Marek's Disease and its Relation to the Age of Slaughtered Broilers. Acta vet. Brno 51,1982: 117-124. An analysis of the occurrence of Marek's disease in broilers slaughtered:in the years 1977-1979 in one poUltry slaughter-house in the South-Moravian Region was carried out. Marek's disease (MD) was detected in 0.9% of broilers slaughtered in 1977, in 0.8 and 0.73% of broilers slaughtered in 1978 and 1979, respectively. From those MD-positive chickens 1.91 % of birds was condemned in 1977,3.94% in 1978 risingto 7.96% in 1979. The other MD-positive chickens were evaluated as conditionally consumable. The main and often single finding in those birds was the skin form of MD,­ while visceral lymphoid tumours were observed only sporadically. More detailed analysis of 479 flocks of broilers proved that infection rate of Marek's disease reached 85 %. Skin form of MD was determined in 304 flocks (63.47 %). Simultaneous occurrence of skin and visceral forms was determined in 101 flocks (21.09%). In remaining 74 flocks (15.45 %) no macroscopical findings of MD were determined after slaughter. The occurrence of skin form of MD in relation to the age of slaughtered broilers was studied in 55 flocks. The incidence of MD skin lesions war more frequent in the flocks of broilers slaughtered in 50-60 days of age than in the birds slaughtered in 61-67 days of age. The occurrence of visceral lymphoid tumours ip. those ·flocks varied from 0 to 0.63 % and was not influenced by the age of slaughtered broilers. Marek's disease, broilers, skin lesions, age.