In winter the cows are kept warm by their thick fur, and by the talle, e.g. the mixture of dung and hay that builds up during the cold season.
(the cows; are kept; by their thick fur; L:In winter) (e.g. the mixture of dung and hay; builds up; T:during the cold season)
the cows e.g. the mixture of dung and hay
are kept builds up
by their thick fur L:In winter
T:during the cold season