Like all other posts read it is hard to dtermine an exact measurement as some days pigeons are hungrier than others dpendant on workload ie, racing, breeding, cold weather , can be detrimental to how much and what feed a pigeon needs l think you need to get a system that works well for you and stick to it , some fanciers have no problem hopper feeding the birds whereas others don, t like it it depends on your own personal circumstances how much time you have to comit to a feeding regime and what you want out of your birds .