Your post is very interesting, Petra.
I was always under the impression once a pigeon reached their full adulthood their weight would pretty much stay the same, setting aside any weight loss due to illness or injury of course.
I have to agree with you and Teresa, in that proper nutrition probably does play an important roll in this.
WOW!! Rudi had a significent weight gain, especially for being an adult.
A Pigeon's Prayer
Please watch over us while we fly,
Keeping us safe from the predators that share the sky.
If we become ill or injured in any way,
Please lead us to safety where we are welcome to stay.