This is just a partial list of the resources available in Southwestern Ontario and is in no particular order. I have not used many of them, so can not vouch for either their product or service. If you know of one I've missed, let me know!
Jones Feed Mills - With locations in Linwood, Wroxeter and Heidelberg, Jones Feed Mills (JFM) is a family owned and operated feed mill and food-grain supply business that has served the agricultural community for over 80 years.
Floradale Feed Mill - an independent, family owned and operated, feed company serving livestock and poultry producers in Ontario.
Wallenstein Feed & Supply - founded in 1958, Wallenstein Feed & Supply continues to be an independent family business serving Ontario’s diverse and agricultural sector throughout the next decade and for many years to come.
Baden Feed & Supply - a family owned, quality driven company that can supply you with top quality feeds
Backyard Chickens - A huge forum that has been around since 1999 and now boasts over 280,000 members from across North America.
My Pet Chicken - Launched in 2005, this website mission is "To make life easy -- and fun! -- for urban and backyard chicken owners with our line of products, free information, tools and resources."
The Chicken Chick - An attorney by trade, Kathy Shea Mormino has a very popular blog and facebook page.
Mike the Chicken Vet - An Ontario based veterinarian who works only with farmers, but has a blog with some very interesting topics.
Fresh Eggs Daily - This site was established in 2009 and is based out of Maine. Lisa is a fifth generation chicken keeper and has some interesting articles on her blog.