Here is a name for a good wormer you can just put in a syringe about 1/2 cc for a medium size goose. It is called Eprinex (a liquid wormer Ivermectin) for cattle. You put the 1/2cc between the two wings. My friend on another forum taught me about this womer.
You worm before the end of Fall and...
Since you now have the brewer's yeast and it has all in it you can use the brewer's yeast from birth for your baby goslings. Since you feed and can only get chicken feed them babies need their niacin and since brewer's yeast has it in there. Keep niacin on hand just in case it is needed for some...
Now with the niacin you can get that from your pharmacy and get regular not fast acting. I hope I have that right. Then you just sprinkle that in their fresh water each day. This helps goslings get all they need while still feeding chicken feed. As you have found out geese need a total different...
I know you have a hard time in Brazil where you live to get the waterfowl feed,
But with putting the brewer's yeast in their water and should be put in their feed as well. That way they get the niacin they need for strong legs and other things. On your feed take and put about a cup of brewer's...
One thing very important is geese need waterfowl feed because it has all the things in it already that goslings need. Plus they need to graze for the grass. There have been many people on here losing their goslings because they are not feeding waterfowl feed!!!
The goslings need the extra niacin...