farmers arent the only ones who have to deal with putting animals down for the well being of the animal. You mentioned using a Vet, what if it is midnight on a Saturday, or a holiday?
Just like we (meaning my family) have to have a hurricane plan for us and the animals, ANYONE raising any animal and or hatching eggs needs a plan in place before you ever get started. Even the hobbiest pet flock owners NEED a plan in place and need to understand holidays and middle of the night emergencies do happen.
everyone has choices and rghts to those choices, but remember you chose to take on these animals and if something comes up or happens you need to be ready, willing, able to end their suffering because a vet isnt always going to be open. i would encourage you to call your local vet offices too. Many wont even touch poultry.