One of my favourite hobbies is following Hillfoot around and disagreeing with him.
I say a few treats won't do any harm! In your case the treats are mostly fruit and vegetables - a cabbage leaf and a few grapes shared between three hens. My pullets get to run around on pasture all day and eat a huge amount of grass and weeds (and flowers, bugs, windfall fruit...) which I consider as much a part of their staple diet as the pellets I provide.
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"Giving them treats may seem innocent but I'd seriously consider stopping doing this more often than a couple of times a week and then in an evening only. Chicken quickly get to learn that there are treats coming and they neglect their staple feed in order to tuck into corn or meal worms or in your case grapes. Also you become conditioned by a mutual gratification process to keep doing it. Is you get cupboard love and they get fed nice things.
It's so easy to convince ourselves that a handful or two does no harm. That's what many mothers think and why we have lots of over weight kids storing up problems for the future. HF"
Lindeggs makes my point very well. It's not what was being given but the frequency and quantity that I was suggesting be cut down on the basis that chx learn quickly that treats are to be had by begging and so don't eat their pellets. Personally I'm a believer that if you don't eat up your greens you don't get your pudding.
We have a bunch of free rangers who wander the garden. Carole used to throw them a handful of corn whenever she saw them near the house "because they were cute" and she was worried they weren't getting enough to eat. Pretty soon they learnt that hanging around the back door was a sure way to a handful of corn. They took to completely ignoring their pellets and just demanding corn. Sometimes coming through the conservatory into the house to rouse us. I eventually had to stop the habit because they were also recruiting other hens from their run to join them so what started out as a couple got to be about 7 hens begging corn and precious little pellets being eaten. Had I just stuck to one handful of corn a couple of times a week in their run on an irregular basis I'm sure this wouldn't have happened.
Does it really matter - well probably not after all they are pets so if they perform for our pleasure and amusement that's probably all part of the deal.
Back on your head lindeggs
HF