Strong argument here and a good article for the value of keeping goats for prolonged survival;
http://www.thedailysheeple.com/how-the-poor-mans-cow-will-keep-you-alive-and-healthy_052013
enjoy!
This is, perhaps, the best article I've read about procuring your own meat post-SHTF. The author goes into a brief overview of each of the critters he raises, their output and his thoughts on what would be required to sustain them without outside resources. It's a short article, approx 5-10...