Ever wondered what you were getting in those commercial poultry vitamins and which brand was better? I can show you what you are getting but you will have to decide for yourself which type/brand is better. You will have to open my data file separately from this webpage because there is no way to display all the data while embedded on this page.
To view the data you have a few options:
A) Download the attached zip file and open PoultryVitamins.ods. The data was created with OpenOffice Calc and will everything should display as I designed it and it is easiest to view the data with this method.
B) Download the attached zip file and open PoultryVitamins.htm. This will open with a web browser but some of the colors are formatted as black and the window doesn't split so the data is a bit harder to read.
C) Go to google sheets to view it:
The window doesn't split as designed so the data is a bit harder to read.
Rows 1 & 2 show the different types of nutrients in a column below them.
Row 3 shows the daily nutrient requirements for hens. This is what a hen must intake on a daily basis. I don't think these are dead accurate figures a hen must have on a daily basis because of age, weight, physical activity, and health, but only as a general guideline.
Rows 4 - 23 show the different brands of vitamins for poultry that I could find. I also included human vitamins to compare.
Probably the first thing you may notice is the big difference in nutrient dose rates between the manufacturers. I have no idea why there is such a wide range. Some are so far apart it's like it's a shot in the dark and some are way over the daily requirement.
I give my chickens crushed up human vitamins (Centrum Silver Men 50+, without iron) every once in a while, 1/4 tablet for each 1 lb of feed. I haven't noticed anything good or bad when doing this.
If you use a quality commercial feed, then there shouldn't really be a reason to supplement with vitamins. I'm sure there are exceptions such as when nursing a sick chicken back to health so you will have to decide for yourself if and when to give vitamins. It is also important to know about the different nutrients so you don't overdose your birds.