hi stud dog the reason I think sows come on heat coming up to the full moon is I breed large white / saddleback pigs have done for 20years and that's when they come on with wild pigs have u noticed when u gut a good boar caught on a fullmoon they all ways have a trumpet full of luvin for u and boars have more fresh scars around that time from fighting over the sows that fighting wheres them out a bit making our job easier but that's just my opinion happy huntin