I find it hilarious that so many people are gnashing their teeth and saying,"it's just a copy of The Lion King". This type of story didn't start in 1994 - the plot is ancient, with even Disney admitting that it was based on some of their earlier films, Hamlet and - get this - Exodus from the Bible (not including the fact that it was alleged that the whole movie was stolen from "Kimba the White Lion, but that's another matter). So, the genre is several millennia old. If people are going to accuse "Barnyard" of plagiarism, they should at least check the original source material before throwing stones.
Anyway, onto the film. I thought it was lightweight, but had some very funny parts. Thankfully, my children (13 and 8) are able to separate fact from fiction, so the images of bulls with udders, getting loaded on milk, stealing a car and evading the police whilst joyriding probably won't have too much of a negative impact on their lives. However, if, when they're older, they fall into the company of a gang of cows with attitude and a propensity for car theft, I'll know who to blame.
Some people really need to lighten up.