First off, sorry to hear about your chicken.
I feel your pain, I raised all mine from chicks, mine are at the age there ready to be killed and replaced with younger chicks but I can't bring myself to do it. I have sold some to down size but have no plans of killing any.
My cattle are the same way, I have had only 4 and took one in to the butcher so far, it felt like dropping a dog off to the pound, very sad and I felt like I made a mistake while taking him in. I sold all the meat and wasn't able to keep any but the 3 that's left I feel will be harder to take in because I have had them the longest.
I learned about the native Americans in school, I learned about how they greatly respected the animals they took to eat, they thanked the animal for its sacrifice and respected the animal enough to not waste any of it.
The grocery store makes things so distant, we never meet the animal that lived and died for our nourishment.
I totally understand the native Americans views now, I have lots of respect for my livestock. I will remember them when there gone and will be thankful they were put here for my needs.
Different animals provide for different needs, my dog brings me great joy and happiness, he's always ready to play no matter how my day went. My chickens give me breakfast everyday and my cattle gives me the protein my muscles need.
I would never value an animals life over a mans, but in a way I respect my animals more than most people. They have/will make the greatest sacrifice so I can continue to live on this earth. Good luck buddy.