How do you calculate the protein content? Is it by weight?
A simple way to calculate protein is this.
Lets say your mixing a scratch grain and your using 40 pounds corn, 30 pounds wheat, 20 pounds oats and 10 pound Black Oil Sunflower Seed (BOSS).
All protein percentages are per 100 pounds of feedstuff. (Example corn is 8% protein per 100 pounds of weight) so you will have to divide the protein percentage 100 pounds to get the protein percentage per pound.
Corns is 8% protein, wheat is 14% protein, oats is 13% protein and BOSS is 16% protein.
Corn --
8% protein ÷ 100 pounds = 0.08% protein
0.08% protein x 40 pounds (the amount being used in mix) = 3.2% total protein
Wheat --
14% protein ÷ 100 pounds = .14% protein
.14% protein x 30 pounds = 4.2% total protein
Oats --
13% protein ÷ 100 pounds = .13% protein
.13% protein x 20 pounds = 2.6% total protein
BOSS --
16% protein ÷ 100 pounds = .16% protein
.16% protein x 10 pounds = 1.6 total protein
Now add all the total proteins together.
3.2 + 4.2 + 2.6 + 1.6 = 11.6
So this scratch grain mix would be 11.6% protein