The latest issue of the International peer reviewed journal Environmental Values has an editorial by Isis titled ‘Ethical Intuitions, Welfare and Permaculture’.  As well as mentioning the papers in the issue of the journal it discusses a problem in animal welfare called ‘the blind hens’ challenge’, which is a great conversation starter.

It is available here:
https://www.erica.demon.co.uk/EV/EditEV236.pdf