Hi Mission2012,
I agree that the 3-item list has an odd "look" to it - normally all 3 items would have the same obvious "format", verb tense, etc. The reason I went about solving this prompt the way that I did was to avoid the odd nature of this parallelism. It IS parallel though and here's why:
Part of the "intent" of the prompt is to list the 3 things that farmers need to do for their cows:
"keep them cool"
"(keep them) provided with feed"
"(keep them) milked"
Both of the phrases in parentheses ("keep them") are implied, but they're not written in the sentence because that would be redundant. Since you wouldn't say "keep them cooled", you have to say "keep them cool" and then the rest of the sentence appears parallel.
GMAT assassins aren't born, they're made,
Rich