Maintaining genetic diversity is a big reason to continue having multiple breeds of chickens, in multiple locations.
I read recently (somewhere) that Tibetan people also have genetic traits that help them live in that environment. Diversity is good!
Also domestic dogs have a very narrow DNA...
Your law in GB does appear to have been not well though out, especially involving small flock owners feeding their own food scraps to their chickens.
Prion diseases are not good, because prions are so nearly impossible to destroy. Takes a flamethrower, not much less. And new examples of...
Already mentioned; 'the road to hell' and it's sad.
Here in the USA, at least in most states, anyone can set themselves up as an animal rescue group, there's no control at all over this. Some are, or become, hoarders, with critters in despicable conditions. Some become so fussy, nobody can...
Any MD should know something about any human, but not any cow, or pig, or whatever. That's the point I'm trying to make. And any veterinarian is still responsible for any treatment tried on an unfamiliar species, not so good if an inappropriate thing is done.
Mary
About veterinarians, and what's actually possible: nobody can learn everything about every species!!! Human doctors only have one species to worry about, and still have evolved into multiple specialties, just talking about pediatrics, GPs, and geriatrics.
Veterinarians try hard to learn more...
Here in Michigan there are some avian specialists, and some veterinarians who have poultry of their own, so develop an interest in poultry medicine.
Very few chicken owners are willing to spend money for veterinary care for their birds, and the veterinarians who service commercial poultry...
Here I think that hatchmates tend to stick together, rather than birds who look alike but are different ages. Broody raised birds will stay with their mama's pals too.
I have a small group of Belgian d'Uccles, started in 1992(?) who are all raised by broodies in this group, or occasionally are...