[cullenking]

there is absolutely a reason to kill your chickens that aren't laying - it costs money to feed them. if you don't optimize for price by slaughtering your older hens you will easily be paying > $10 a dozen for eggs.

all bets are off though if you consider chickens pets, instead of livestock.

basic economics for me: 20 chickens, a dozen eggs a day, 30 dozen eggs a month. decent non-organic feed is $20 a bag, organic is $35 a bag. one bag per week if you have the space to do daily free ranging on a decent sized chunk (half acre chicken yard in my case). Round up $0.50 per dozen for incidentals (bedding, repair, replacement chickens semi-regularly due to predation). That's $3 a dozen for non-organic, $5 a dozen for organic.

Drop productivity in half, organic eggs start costing $10 a dozen, and you have to work for those eggs. Cut productivity to 25% and you are even more expensive. In my experience, you are at 50% productivity within 3 years depending on the breed.

Also slaughtered old hens make good soups :)

[ammojamo]

All good points, but I would add a couple of things:

1. Scale also comes into play: We only have 8 hens, and are able to significantly supplement their feed with scraps from the kitchen, which are effectively free. The chooks are free ranging over a similar area (~half an acre), so the lower density means more free-range food for them, I guess. As a result, our feed costs per egg are actually much lower than if we had more chooks, and keeping a few old hens around is a negligible cost for us.

2. We regard our chooks somewhere halfway between pets and livestock - it's not a binary choice. We enjoy having them around so they have some intrinsic value for us, but at the same time if they were getting too expensive to keep, we'd be OK with occasionally cooking one up.