On January 23, 1979 the DDR issued a set of six "Poultry Breeds" stamps (Mi. #s 2394-9). Here is the set on a registered cover to the USA.
10pf bantam (porcelain ware)
15pf country chicken
20pf feather foot (porcelain ware)
25pf Saxon chicken
35pf Japanese phoenix bantam
50pf Italian striped country chicken