Many gamebird raisers will invest a lot on vitamins which they give to their roosters. Often times, they would even buy vitamins made for humans such as Centrum Silver, Centrum Performance, and Kirkland Multivitamins that is why many poultry supply stores would be selling these.
Let us remember that these vitamins are made for humans which on the average will be weighing 50 kilos as compared to our roosters that would way about 2 kilos only. If you want to use these type of supplements, please don't give them the whole caplet. Divide it into 3 or 4 pieces and this is the amount you give to your birds.
We classify vitamins as supplements because it is of great value if the roosters are not getting a balanced diet that will supply their basic requirements. It will function to fill in the deficiency that the feed does not supply to them. Once the requirement of the rooster is met, all excess vitamins will be of no use to them.
For the water soluble vitamins, this will be expelled usually thru the urine. That is why in humans, after you take your multivitamin pill you will notice that your urine will be very yellow in color. This will not pose so much of a problem when we are talking about water soluble vitamins.
It is a different case for fat soluble vitamins such as vitamin A, D, E and K. Any excess will be stored in fatty tissues or organs and too much excess can actually cause vitamin toxicity. So be careful for it is not recommended to overdose your chickens especially with fat soluble vitamins.
That is why I would recommend that it is wiser to invest in a feed that can fully deliver the needed nutrients your feathered warriors require, even if this feed will cost more than the rest of the feed in the market. You are assured that they receive the right balance needed by your chickens. If you factor in the additional costs you put in to buy supplements, the better feed out there will turn out more cost effective.
I take vitamins everyday, and to be honest, I really don't feel a distinct difference, that is why when I miss taking my vitamin supplement it hardly has an effect on how I feel or perform through out the day.
Try skipping a meal for a day, you will be irritable, hungry, and even feel weak. It is better to eat right each and every day, then to eat wrong and depend on supplements. This is the same with the chickens we care so much for.

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