I tried to do something similar when deciding where to donate. The most significant difference was step 4. I used neuron count as a multiplier. For example, according to http://reflectivedisequilibrium.blogspot.com/2013/09/how-is-brain-mass-distributed-among.html, cows on average have 13.6 times more neurons than chickens. So in my model, one minute of cow’s life was 13.6 times more important than one minute of chicken’s life of comparable quality. I’ve seen some people comparing the square root of neuron count instead. http://ethical.diet/ makes it easy to make these kinds of comparisons for farm animals.
I tried to do something similar when deciding where to donate. The most significant difference was step 4. I used neuron count as a multiplier. For example, according to http://reflectivedisequilibrium.blogspot.com/2013/09/how-is-brain-mass-distributed-among.html, cows on average have 13.6 times more neurons than chickens. So in my model, one minute of cow’s life was 13.6 times more important than one minute of chicken’s life of comparable quality. I’ve seen some people comparing the square root of neuron count instead. http://ethical.diet/ makes it easy to make these kinds of comparisons for farm animals.