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(because the percentage of protein doesn't matter so much as the overall amount of protein; something that I know is rather difficult to visualize),
Are you talking about TDN (Total Digestible Nutrition) ? If not you just lost me because if the tag says 17% protein that means that there is 17% protein per 100 lbs of feed..
something they're unlikely to do because they feel full from all the non-protein
"Felling full" has more to do with Carbohydrates and Fiber than Protein.
but more filler
So "filler" in feed would be??? I would love to know just what you are calling a "filler".
Chris
Well you can look at it like this also,Chris, morning..... If a chicken can eat only 100 grams of feed per day, then they get 17 grams of protein.....
If you need for them to get more protein, cut the corn out of their diet... At approx. 7% protein, corn would be considered a "filler" for lack of a better term, when you are trying to "UP" the protein in the chickens diet..... If the corn is 25% of the diet, 1.75 grams of protein has been removed... If you then add the remaining feed back up to 100 grams, (since 25 grams of corn was removed), your 17% protein feed is now up to (15.25 grams,(after the 1.75 grams subtracted for the removal of corn), 15.25 grams x 100/75 = 20.33% protein .... 20.33 grams of protein per 100 grams of feed......
Sooo, when a chicken can only eat 100 grams of feed per day, and you remove the corn and replace it with what is left, your chickens will get 20.33 grams of protein per day ......
In that instance...... corn is considered a filler...... other stuff can be considered a filler also........ I only used corn as an example.....
I'm not putting this post up to start a discussion...... only to explain "WHY" you can call something a filler...... depends on your goals.....
One more example.......
When you buy seasoning from the store...... It has salt in it...... In that instance, salt is a filler because it is so cheap.....