A good list of skills and some home recipes for animal husbandry related products plus some recommendations for commercial products (which may not be available post-event)...
http://www.survivalsullivan.com/emergency-husbandry-skills-preppers-know/Make a copy of this for your prepper docs, even if you don't presently have farm animals... Someday your may...
Needless to say, ,this not an exhaustive list and there are MANY books on this subject, almost as many as there are for human medicine... Expand your library at any chance you are offered.