Was mucking up after some horses this afternoon, and another analogy about protein came to mind.
With soy based feeds, the protein level is a bit like a pre-fab chicken coop. It comes with all the necessary parts, but you have to unpack it, and then some assembly is required to put it together into something you can use. Except with a Soy based kit, they did not include any nails, or at least not nearly enough. Those missing nails would be like the essential amino acids you have to get from another source. You can get two kits (double your protein), but until you find some nails, you won't be any further along with putting the thing together than you were with one.
Or you can switch to a different type of kit (fish meal) that does come packed with everything you need. That might sound good and may work for you, but feed companies sell to customers that can't or won't use fish meal, and to add to that, fish meal has a short shelf life and goes bad quickly.
With soy based feeds, the protein level is a bit like a pre-fab chicken coop. It comes with all the necessary parts, but you have to unpack it, and then some assembly is required to put it together into something you can use. Except with a Soy based kit, they did not include any nails, or at least not nearly enough. Those missing nails would be like the essential amino acids you have to get from another source. You can get two kits (double your protein), but until you find some nails, you won't be any further along with putting the thing together than you were with one.
Or you can switch to a different type of kit (fish meal) that does come packed with everything you need. That might sound good and may work for you, but feed companies sell to customers that can't or won't use fish meal, and to add to that, fish meal has a short shelf life and goes bad quickly.