Pasture
A cow in the winter doesn't like to leave the barn to go to the pasture. It has to, though, because a cow's gotta eat.
It's cold outside (it's winter after all). Imagine you having to herd all the cows out to pasture even though they don't want to leave the warm barn.
ぼく
まき
None
ぼく is one of the common ways to say "I" in Japanese (which you should remember!). In this case, you're a boy... a cowboy, and you say, "ぼくwill take these cows out to pasture!"
Actually say that phrase out loud while thinking about bringing your cows to pasture.