I'm an idiot - ppm to amount in feed?

[eqsiu]

Okay. When a feed has so many ppm of a nutrient, how do you figure out how much there is per pound? I should know this but...:no:

[SkipHiLad4me]

I think ppm = mg/kg, which is usually what your minerals are listed as, so you'd have to convert your pounds of feed into kilograms in order to keep your units the same.

[Peggy]

ppm means part per million so one pound of nutrient per 1,000,000 pounds of supplement. Or 0.000001 pounds of nutrient per pound of supplement. That's not very helpful, but one pound is 454,000 mg (with rounding), so 0.454 mg of nutrient per pound.

IF I did my math right and I just finished teaching for 5 hours straight.

[JoZ]

You'd have to divide the ppm value by 1,000,000 to yield a percentage or multiplier. Say for example:

250 ppm
feeding 5 lbs of feed

250/1000000 = .00025
5 lbs = 80 oz
80 oz X .00025 = .02 ounces of whatever the ppm measurement was for

[JB]

It's not difficult.

1 ppm is 1 mg per kg - 1mg/kg.

Since 1kg is 2.2lb, that's the same as:
1ppm = 1mg/2.2lb

That allows you to translate to pounds or ounces, depending on the need.

3ppm Selenium, for example, is 3mg/2.2lb of the stuff. If you're feeding 1lb of the "stuff", divide by numbers by 2.2 to get the 1lb mark. That gives you 1.36mg/lb.

If you then need to get to the ounce level (such as for a vit/min supplement) divide by numbers again by 16 - .085mg/oz.

[JoZ]

1 ppm is 1 mg per kg - 1mg/kg.

Since 1kg is 2.2lb, that's the same as:
1ppm = 1mg/lb

Did you mean to say, that's the same as:
1ppm = 1mg/2.2 lbs?

Which is the same as 0.454545 mg per lb.

And also the same as .004 oz/lb.

[JB]

Yes, sorry, I was jumping ahead if myself :) Going back to fix that now, thanks!!

[nikki3]

http://animalscience.ucdavis.edu/MineralProject/conversion.htm

[eqsiu]

Ah! Thanks, it was the 1 ppm = 1mg/kg that I was missing.