Don't treat what you don't have, it isn't the cheapest, not cost effective AT ALL, or best for your animals or the environment... Get a float and find our YOUR species and load count, make SURE you are using the right dewormer for what you have IF you need to treat. It cost $28 at my vet who does see birds (I also use the group collection method and is considered acceptable by the vet). I have seen it cheaper for mail away services. And with so many animals, maybe consider investing in a microscope to run your own floats! There are tons of tutorials on line.
For what it's worth... I had symptoms (in a chicken) everyone will SWEAR is worms... muddy bumm, diarrhea sometimes yellow and frothy... from 1 gal only. A float confirmed she was parasite free and it was a personal issue for THAT bird. But if I followed the worm often folks... I would be giving small amounts of poison to all my birds for no reason, withholding eggs and so on, plus the worm medication expense and the time and effort spent administering it to all the animals. Float have prevented useless treatment for my crew for over 10 years now! Of course... YOUR load may be different than mine!
Only large round worms and tape worms may ever be seen in the droppings under heavy load. All other species will stay in the intestines and only their microscopic oocysts (eggs) will pass in droppings to never be seen. So many things can effect YOUR load... including your wildlife load, stock density, soil type, weather pattern, and personal husbandry/ waste removal practices.
It seems as though everyone has their opinion about worming. Mine is that you CANNOT go wrong getting a float first... maybe a couple times a year until you become familiar with YOUR load... and if appropriate MAYBE then plan a treatment schedule and remember when possible alternate medications and always follow through with the full course to prevent building resistance in the parasites.
And while we are at it... please don't forget to check for external parasites. Doing so after dark with a flashlight will give you the best overall picture. Part feathers below vent and on abdomen and look for crawlies running away, angry red skin, or dried "mud" clumps (nits/eggs) stuck on bases of feathers. This scenario is the opposite of worms for me... in that folks swear they don't have them and have never seen any but sooo many times after discovering how to best search, they discover they do need to treat. My friendliest hen that sits on my lap regularly and lets me inspect would have me thinking I never faced them. And after hours inspection of other flock members told a different story. And even after taking one bird to the vet to confirm or deny... and was denied... the same day I came home and inspected another bird who was leaving and was loaded... they don't all have the same bathing/foraging habits or immune systems.
Float first... or before and after treating with "herbs" to verify need and efficacy of selected treatment (please share result if you do!)... in ALL animals including, buns and goats. I have or have had all of them... Buns, goats, ducks, chickens, turkeys, dogs, and pigs...
Hope this gives you some food for thought and good information instead of just causing more confusion!