YOU SAID:

There once was a boy who loved his pet chicken very much, and petted its plumed head every day.

INTO JAPANESE

一度彼のペットの鶏を非常に愛し、毎日その羽毛の頭を撫でる少年があった。

BACK INTO ENGLISH

Boys love very much his pet chickens again, stroking the feather head every day.