To me as an animal researcher it really is not difficult to grasp, and it should not be to anyone else either: if you want to to do animal research, your approval to do so depends on you arguing why you use animals, which animals, and how many, according to the 3R principle of reducement in numbers, refinement (of techniques, so as to get the best results, and also the first R), and maybe, just maybe, replacement (which may depend on the second R - for instance, we now can do many things with cell cultures). So you want top quality, purpose bred animals, disease free, maybe of a particular strain, or with a certain mutation or genetic manipulation that makes those animals better models. Commercial animal breeding companies can only make money by providing such animals, and like the farmer, neglecting welfare and not giving sufficient care means you lose animals, then customers and there goes your profit. Captive bred animals will not be upset by laboratory conditions (less stress), and not having to transport them over great distances by in-house or at least within-country breeding is the best. And forget what I think was in one of the above comments - animals are not cheap - they are very expensive, even a simple mouse costs big dollars. Even if you are not much of an ethicist, all of us are economists.... moreover, where I am, you get approval to use a certain number of animals only after careful screening and providing statistical support, and extra animals beyond approved numbers require good arguments. And Ann: forget about two-way communication with animals - we cannot even do it with chimpanzees except with regard to immediate requests, and a lot of that is not regarded very highly by many. What we can do is look at animals' natural needs and behaviours so that we can provide for the fulfilment of those needs in captivity. But even here there are limits, just as an animal might have those in nature. For a good life with me until he dies (and even that death may be my decision, and spare him the pain of a "natural" death) my horse has been gelded, and although his paddock is several acres he cannot roam free. My cats have a wonderful life but are not allowed to roam, and all have been neutered or spayed too. And nowhere is it written in stone that no animal shall ever suffer some stress, or even a little pain, no more than we can guarantee that for humans. Animals kept totally stress-free suffer from lack of stimulation; my domestic animals are subject to the surgery of desexing, and the stress of vaccinations. You get my drift, I hope...
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