I believe dubbing is done at hatching, when the comb is not that
developed. I wouldn't try it on an adult bird. It's a little like
castrating a larger animal -- tissues which are still small and have
little blood supply at birth will grow quite a bit more complicated and
full of blood vessels and nerves in the adult.
A bird dubbed at hatching will not suffer from comb injuries -- which
are, after all, amputations or worse. It was done to save the bird
from stress and pain and possible death from an injury. It still
works. It was done for certain breeds in the past, and is still done
because 1) some types of birds are more likely to go looking for trouble
and 2) it is the way a well-groomed bird of that breed looks (Game
Birds). It is a little like ear-cropping on terriers. For people who
object strongly to dubbing, I want you to think about how some breeds
are fiestier and will get into mischief -- whether it is tangling with a
thorn bush, roosting outdoors during ice-storms, squabbling amongst
themselves or protecting their hens from a predator attack.
Frostbite may cause infertility for a while in an adult bird because the
bird is so terribly stressed -- depending on how bad it is, it can
become a major amputation or start gangrene. Really rough on the animal.
Side note: Actually, most dubbing, ear-cropping and tail docking in
agriculture was due to trying to keep animals alive in a harsh world in
the days before antibiotics. Now that we have some working antibiotics,
people think it is unnecessary, however, if our antibiotics all stop
working, it may not look so cruel or harsh compared to letting an animal
die of gangrene when an injury gets out of hand. That was a daily
certainty in the bad old days, pre-science.
Think about it -- a nice soft and delicate bit of tissue full of blood
is bitten by a cat or raccoon's dirty teeth -- infection sets in. It
could get really nasty and deadly.
I wouldn't dub your adult birds, but consider ordering rose-combed or
other short-combed birds in the future (try the Russian Orloff or the
Canadian Chantecleer or any of the Wyandottes). Or order your
production chicks pre-dubbed at the hatchery.
Just a thought.
Chris
Little Biddy Farm
--
"Humankind cannot take too much reality."
T.S. Eliot