vinay
Re breeding:
I honestly don't know anything about Doves.
As to Gouldians, I have had much better success with them housed In a cage on their own.
My one pair, housed In a seperate cage did and are doing very well. A conical wood house used for a nest. Five out of six eggs hatched and were successfully raised. Same five young just recently weaned. My couple, is already incubating a new clutch of six eggs.
My other Gouldian pair, laid 6 eggs in a community flight, in a fabric enclosed nest together with Societies finches. They did not incubate properly (the Socies did). Five babies hatched. My Gould male tossed and drowned one chick, another chick disappeared, then he tried to toss the others , while female tried to pluck them. I had to remove the parents and leave the three remaining chicks for the Societies to raise (which they did).
As to Canaries. I do not breed them now and haven't done so in many, many years. However, Canary males do become pushy and down right aggressive during 'breeding season' and should not be housed with others during that period. The rest of the year should be fine with other species.
My boy Luciano, is housed in a large flight with Gouldians, Parrot Finches and Society Finches. He does very well until breeding season comes around (and keep in mind that I don't even own a female Canary at present). However during breeding season, he becomes territorial, starts hissing at other birds and has been known to attack a male Zebra Finch in the past. When he becomes too miserable, I do place him in a cage on his own. Once he goes into molt, he goes back to the flight and there are no more problems.
So, if you want successful breeding, a separate breeding cage would be advised.
Goodluck.
~Elana~