Indeed. And what's been almost absent from our discussion so far is what exactly is in commercial feed. We've written about it as if it's uniform. Those who buy it could have a look at what they get, and we could compare here, because I imagine there's a lot of variation between countries and climates.
Very good idea. Unfortunately my partner keeps throwing away the feed bags before I can take pictures, I'll do it next time we buy them. Different brands here do different stuff, but as U_Stormcrow mentioned the protein are usually relatively low and compensated with loads of additives.
Here are example of two organic layers feeds I've used in the past for which I could find the composition online. I'm using Google translate sorry if it's includes some funny mistakes again!
First layer feed :
Triticale (wheat x rye) whole, cracked corn, peas, split fava beans, calcium carbonate in particles, dicalcium phosphate, mineral mix, vitamins and trace elements, organic vegetable oil.
Ingredients guaranteed without GMOs or additives.
Crude protein: 12.8%
Crude fat: 2.
crude fibre: 3.2
Ashes 11.
Methionine 0.1
Lysine: 0.6
Phosphorus 0.3
Sodium 0.1
no info regarding calcium content.
Additives: Vitamins A D3
Choline chloride, Iron, manganese, Iodine; selenium
Second brand :
Wheat, tritical, sunflower expeller feed, soybean expeller, faba bean, alfalfa, barley, calcium carbonate, dicalcium phosphate.
Additives
Vitamins, provitamins: vitamin D3 (E671) 3000 IU/KG, Vitamin A (3a672a) 7500 IU/KG, binders-caking agents: sepiolite (E562) 0 M
Digestibility enhancer: 4a1604i Endo-1, 4-Beta-xylanase EC3218 Rovabio 1100 visco/kg 4a1604i Endo-1, 3(4)-Beta-glucanase EC3216 Rovabio 1500 visco/
Trace elements: Copper (E4 sulfate) 10MG/KG, Iron (E1 sulfate) 40 MG/KG, Manganese (E5 oxide) 100 MG/KG, Zinc (3b603 oxide) 100 MG/KG, Iodine 3b302 (anhydrous calcium iodate ) 1.50 MG/KG Selenium (E8 sodium selenite) 0.3 MG
Analytical constituents :
Crude protein 18.20%, Crude fat 4.70%, Crude fiber 9.20%, Crude ash 8.30%, Lysine 0.79%, Methionine 0.29%, Calcium 1.90%, Phosphorus 0.63%, Sodium 0
.17%nts:/KG.kgG/KGves:us 0.63%, Sodium 0.17%