What I expected to happen was...:
The cow to enter love-mode when I right-clicked on it with wheat. Same for the Ocelot with raw fish.
What actually happened was...:
When I right-clicked on a cow with wheat, nothing happened. No hearts and the wheat remained in my hand. Repeated on other animals with their correct food and no result.
Steps to Reproduce:
1. Creative mode spawned cow and wheat.
2. Tried to feed, didn't go into love mode.
3. Went to Survival mode, and repeated. Same result.
4. Tried with other animals (Ocelots, chickens, sheep) with their respective foods. Nothing.