There’s a good one on Gaby Vandenbeele where he talks with sub titles about his Gaby feeding system from beyers and the idea behind it which I copy in a way
Plus there’s a VL when the guy explains the idea behind the gerry plus feeding system
there all pretty much the. same low protein keep blood thin and add fats in there 30 years ago you would have been a God as even the widowhood men were heavier and would have benefited from today's feeding but lots of birds haven't got the necessary body fat to get home if it goes wrong like it dies on more occasions than we would like nowadays years ago everyone fed high protine most of time and most turned up day after as they had the reserves to do it