I've never had a problem with Guinea hens and my other livestock.
It's never too late to start! I retired to homestead on the slopes of Mauna Loa, an active volcano. I relate snippets of my endeavor on my blog : www.kaufarmer.blogspot.com
Life just hasn't been the same since the volcano erupted and now the air is full of tiny ads.
Permaculture Voices 1, 2 and 3 - all 117 hours of video!