Was the goat really slaughtered?

Just a few minutes into this film, there's a scene where the goatherder kills a goat with a knife. He punctured the goat's neck with a knife and then the scene cut to another. When the knife made the puncture, the goat tensed up and made a terrible sound. I've watched a lot of horror films, and can always tell something's fake, but this looked completely real. Anyone know if this was real? If it is, I can not see how they made it look so real.