When the farmer's away, all the animals play, and sing, and dance. Eventually, though, someone has to step in and run things, a responsibility that ends up going to Otis, a carefree cow.
This movie contains 2 potentially triggering events.
Yes. A cow gives birth at the end of the movie. It's not shown obviously as this is a children's movie but two characters do discuss the child "getting stuck."
Vaguely. There is a rapper character named Biggie Cheese but he's a bit hard to understand and the lyrics probably won't come across as sexual to a child.