The same general considerations that we have referred to in connection with the use of animals in factory farming and for scientific experiments apply also to their use as a source of organs for transplants.
It seems likely that the main question here is, ‘Who is to be helped?’, and an immediate answer includes ‘all those in need of transplants for organs’, not least the heart, so transplantation from animals to humans would help persons.
The calculus would also have to consider the possibility of transmitting infections from donor to recipient, although Fletcher points out that agapeic calculations always carry some risk, otherwise there would be no need for calculation in the first place.