I would not worry to much about the stress. I would be more worried on hot days here, unless you can get them out as soon as they lay.In an attempt to improve the breed I was going to start trapnesting last summer, build a cabinet incubator with separate hatcher and set eggs like mad. Then last May I got in a battle with my city which lasted 9 months for the ability to keep chickens at all, so putting labor and time into trapnests or anything else chicken related was something I put on hold. I even sold and gave away a lot of my birds. I recently won the battle. Lo and behold the new ordinance allows grandfathering for the number of birds one already had, so reducing my flock size worked against me.
The good news(if needing a permit is good news) I just picked up my permit to keep 85 chickens of which 5 can be roosters so I'm back in business.
I'm fearful that trapnesting will be stressing the birds. It probably wouldn't be a big deal for most people, especially if their birds are pets but as you know one required characteristic of Penedesencas is that they be a wild bird. Their wildness stresses them quite easily with humans or other predators around. I'm afraid that they'll soon associate the trapnest with something dangerous - especially if I can't figure a way to release them and get their legband # without them seeing me.
The purpose of trapnesting, besides selecting for conformation and color, I'm working to determine each hen's production and egg size and working on darker eggs.
I just found the following site concerning stress factors that affect egg color.
http://www.darkbrowneggs.info/#/factors-affecting-shell-color/4542701177
Paragraphs 3 and 4 talk about fearfulness at the end of the laying cycle. If in fact trapnesting would stress them it would work against determining the darkest layers.
I have some small breeding apartment coops and within a couple days of putting a hen in them they quit laying so trapnesting is my best bet other than sitting by the nests all day.
My PP pullet is not that wild. I think they really mean good foragers. Hendersens says:
well adaptable to free range; active; flighty; avoids human contact.
They are kept in confinement is Spain.
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