Jerseys and Guernseys (4)
I believe the answer is:
cows
'jerseys and guernseys' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cows that I've seen before include "Domesticated bovine animals" , "Female bovine animals" , "Kine" , "Female cattle" , "Female bovines" .)