Current veterinary practice includes transfusions. There are blood banks for common pets like
dogs and cats.
Avian transfusions are less common, but also studied and performed.
This article suggests that not a lot of work has been done on establishing a formal typology for avian blood types, though it does describe testing compatibility between a particular donor and recipient -- which, interestingly, don't even have to be the same species, though apparently that makes success more likely.
The procedure is more or less the same as for humans: poke a needle into a vein, preferably run the blood through a
filter, put it into the recipient. The linked article also mentions an intraosseous transfer as opposed to intravenous, which if nothing else sounds painful.
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in spite of how ludicrous the question is
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Hey, this is the GURPS forum. We cover anything from detailed analysis of the physics of near-C cream pie planetary impactors to intelligent psychic blueberry muffins. Giant chicken trauma med practice isn't even approaching the boundary of ludicrousness.