I know what Trev is saying, and when I look at what race horses are fed these days, compared to what they got 50 years ago when i was an apprentice jockey, it's mind boggling.
Another piece of advice which was once 'set in stone' was that you fed your pigeons until one left the feed and went to the drinker. Then all the feed was taken away.
So the big, hungry pigeon ate all it wanted, and the smaller, less bold pigeon went to bed hungry.
Some of the very best fanciers these days, those who are willing to share their methods, agree that you cannot feed your pigeons too much.
I feed all mine morning and night, about 1/3 in the morning, and 2/3 at night, more or less.
In the afternoon I put a certain amount in the trays, and when it is nearly gone, I put more in, so the smaller, younger or more timid ones are still getting a good feed, and not just getting the bit of wheat and milo that's left.
On a good day, when the pigeons have been flying hard and have a good appetite, and I gauge it right, there is not much left.

On other days there's some feed left. I take it away and give it to the wild birds.
But I never have a bird go to bed hungry, if I can help it.
