Well, if you look in different dictionaries murder doesn't apply solely to humans.To assume that is anthropocentric (using that word makes me sound pretty uppity doesn't it):

Murder:to kill or slaughter inhumanly or barbarously

To kill brutally or inhumanly.

To kill intentionally and with premeditation.

I would argue that the meat industry is indeed mass murder. Regardless of the semantics of one word, the meat industry takes a lot of life on a MASS scale. More often than not it(the killing) is inhumane,cruel, and often in violation of work safety and animal welfare regulations. The meat and dairy industry creates a huge amount of environmental damage, so if you don't care about animal welfare, take some self consideration into account.

If you can get over the fact you like the taste of something and want to perhaps look at a more sustianable and humane diet you might want to read "The Ethics of What We Eat" by Peter Singer.
Or "Diet for a New America" by Tim Robbins.(I think it's Tim). If you can't be bothered reading try watching "Fast Food Nation" A dramatised version of Eric Scholossers excellent book Fast Food Nation. The scenes within the slaughter house were shot in a REAL Mexican slaughter house.