I lost my very first litter of Guinea hogs due to inexperience and poor housing design. I researched European farrowing arks, but could not find any designs for one. I sketched out what I wanted, and my husband designed a portable shelter that was great for shoats and boars and included features for more successful farrowing. They provide shade on hot days and windbreak on windy days, as well. I had very few cases of crushed piglets with this set up.