"I have big chickens."
Translation:Já mám velká kuřata.
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As I see it, 'chicken' is an american usage that includes a bird on the table, and one in a hen house, or free range (!) Elsewhere, the two have separate words. A chicken is young, as is a pullet "slepice do 1 roku". https://slovniky.lingea.cz/anglicko-cesky/ku%C5%99e I carefully submitted: slepice, as the context seemed to suggest laying birds.