As CEO of Freedom Feeder slow feed nets, I want to thank you for posting this article. Since 2007, I have witnessed horses using our slow feed nets drastically change their demeanor in some manner because the small mesh so beautifully mimics natural grazing. They actually opt to eat from the nets vs any loose hay on the ground because is it more instinctual for them to have hay available 24/7 and to take small bites. The more people we can reach about using slow feed systems, the happier and healthier our horses will be.
I'd like to know what kind of slow feeder is appropriate. I have heard negative feedback from veterinarians and equine dentists on slow feeders with metal mesh (and metal hay racks), regarding the damage they can do to teeth. It'e especially a problem with homemade DIY slow feeders, I think.
I have read several places that the nylon rope slow feeders over time damage some horses teeth. I believe with this article there should be more information. What style of nets are best, how to choose the size of holes that are appropriate for horses.
According to my vet, the general rule to avoid frustration/stress (which can lead to ulcers) are holes no smaller than 2 inches.