allthough very interesting indeed, i have in fact just been discussing fanciers going by the book,, so to speak , as theres many different veiws on this subject , it may well be worth trying things and experimenting on things that work,,or dont work ,, when i see " pigeons dont sweat" this is true,,,, but like dogs , they can" sweat" in a different ways ,,,, we allways seem to think on pigeons, in line with humans,, this, to me is completely wrong , they see different, smell defferent , they fly, their metabolism is different ,, in fact the are just completely different , we seem to think they can only loose valuable minerals in their droppings etc, but it must be remembered that a pigeon breathes completely different than us,, we can dehydrate by sweating and by panting, as a pigeon cant sweat but it can breath [hopefully ] and it must be remembered that a pigeons bones are hollow , and in fact can breath through its bones also , so a pigeon, in my opinion can deheydrate in many ways that is so different from humans , therefore the need to replace these body mineral salts are needed for the abnormal work load we place on a mere 16 ounces bunch of feathers,, only my opinion, and my own obsevation, they do recover quicker from a hard race by giving electrolytes [of some kind, maybe your own tried and tested kind ]