Hello checkingon,
Yes, Nutridrench is a good vitamin supplement. I will give my rooster one dose orally, 1.5 mL, with an oral feeding syringe. Once is usually enough, but you can give a second dose on day two, if he still seems weak.
Isolate the rooster if he is sick, then you can take better care of him. Of course, if you have multiple roosters, they must all remain together. Or, you will not be able to return the single rooster to the flock.
A Tablespoon of tuna, sardines, or other cooked meat, each day for three days will boost his strength. I also will add some cooked grains: pearl barley, oat groats, brown rice or wheat berries, and some diced fruit to improve appetite and energize. Feeding fresh greens like: Mustard, kale, broccoli, turnip tops, chard, collards, and cabbage are all good for keeping the hens and rooster healthy.
My rooster weighs 8.5 pounds, and he is very active on the property. Also, he is no Spring chicken, at 4 years of age. He is a good boy and deserves some tender loving care, just like my hens, when he is not feeling good.
You also, need to do a physical exam on your rooster when they are sick and at least once every 4-6 months.
My basic rooster check up:
- Look at their poops, are they normal?
- Feathers, are they shiny and even? Any lice on the wing feathers?
- Look at his skin, are there any scabs, pimples, mites?
- Check under his feet, any cuts, scabs or sores?
- Feel under his breast and belly area, is it bald, any sores?
- Leg scales should be smooth and not crusty.
- The comb should be smooth and red. Are there any odd colors or growths?
- The eyes should be bright and clear.
- Check his vent. If it's caked up with poop, he'll need a soak. If you are breeding him, a clean vent is important. Also, a blocked vent in roosters and hens is not good! Also check for lice and mites here.
With the vitamin supplement and energy boosting diet, he should respond within 12 hours. If not, then he may be sick from something else.
Herbs are really good for keeping your chickens healthy, but the availability of certain herbs depends on what part of the world you live in. Herbs are used in all cultures around the world. Some herbs, like Turmeric, come from India, and yet, is imported worldwide.
So, it is just a matter of researching the herbs available to you, in your host country.
These are my thoughts based on my experience with roosters. Please consider other members advice, too.
God Bless to you and your rooster!