That's Broiler feed? I mean sure, the protein looks good, which you would expect for a broiler, but I'm not understanding the calcium levels, and at a glance, I'd suspect you aren't in the US. Dicalcium phosphate is rarely used here, due to our ready supply of oyster shell.
OK, understanding that I am NOT a nutritionist (animal or otherwise) by training, and have nothing more than some month's reading to guide me...
Maize ("corn" in the US) is a low cost, low value filler used to bulk out chicken feed and provide quick energy. Its not a good source of protein (typically less than 10%, potentially as low as 8%), has accceptable levels of fiber, and is only a little high on fat. But it is very "middle of the road", in that its deficiencies are relatively easy to work around by supplimenting with ingredients high in individual feed values. Its amino acid profile is also sub-par, but works well with common complimentary ingredients. In short, its "filler", but its valuable filler in that it buffers more nutrient dense ingredients.
Wheat is a high value (and higher cost) grain, which can be either a low protein "soft" wheat or a higher protein "hard" (often called winter, sometimes "durum", sometimes "red") wheat. Even the low protein wheat has better protein than corn, and both varieties have a superior amino acid profile, across the board, to corn (which you sort of suspect, given corn's lower protein). "Hard" wheat brings about 50% more methionine, and about 30% more lysine, threonine, and tryptophan than soft wheat per kg - the four most common limiting amino acids for poultry, though its generally below target in each of the four. Both varieties of wheat tend to be a bit low in both fiber and fat.
Soybean meal is a common legume, meaning reasonably priced, which provides both a highly concentrated protein source AND one of the best amino acid profiles in the plant world. Soybean meal is often north of 44% protein and one of the best plant sources for methionine, lysine, and threonine - which is why its commonly found in feeds. Unfortunately, all legumes have some anti-nutritional factors, but the heat treatment used in processing the meal tends to correct many of those. For reference, soybean meal typically contains about 250% the methionine, 500-700% the lysine, 400-500% the threonine, and about 300-400% the tryptophan of an equal weight of wheat.
Soybean oil, in studies, has been shown to consistently aid in weight gain and deposit of of fat in chickens (though its effects become less pronounced as the AME of the feed increases). In one study, adding 30g/kg soybean oil to a 12 MJ/kg diet mproved weight gain about 7%, but less than 4% when added to a 13 MJ/kg AME diet. Its here primarily to bulk up the bird.
Dicalcium Phosphate is a common source of both calcium and phosphate outside the US. Here, its expensive relative to our readily available oyster shell. Target for broilers *SHOULD* be around 1% calcium +/-, with roughly half that amount as DIGESTIBLE phoshorus. In studies, calcium toxicity on broilers, and partuclarly roosters, was lower in birds fed CaHPO4 than those fed an oyster shell equivalent, CaCO3 - likely due to the increase in non-phytate phosphorus.
Limestone is essentially compressed sea shells, largely calcium carbonate (CaCO3) in various forms, argonite and dolomite most typically, plus lots of trace minerals. I'm at an absolute loss as to why its included here, given that the target calcium needs of growing birds has already been met by the CaHPO4 above. If its for the trace minerals, there are better ways of obtaining those (here in the US, at least)...
DL-Methionine and L-Lysine are both synthetically produced amino acids. They are added here because, even with the soybean meal, the levels present in the feed aren't sufficient to meet the optimum nutritional needs of fast-growing breeds like a Cx and similar broilers. Here in the US, the amounts that can be added are limited, unsure what laws are applicable to you.
Our National Resources Conservation Service used top recommend broilers in their first weeks of life (doing some conversion here to translate into yourmeasurement system) recieve 23% protein, 5g/kg Methionine, 11g/kg Lysine, 8g/kg Threonine, 2g/kg Tryptophan (there are others, but if you hit those four, its almost certain you hit targets for the rest, while missing any of those four will stunt growth more than deficiencies in some of the others - these are particularly key for muscle, joint, skin, intestines, and feather development...)
You happen to be below our recommended protein, but above our recommended amino acid levels - that's quite common in the EU, where high protein crops are expensive, and more recent research (last two decades +/-) has shown great promise in reduced protein feeds supplimented with critical amino acids. (We have more cropland, its cheaper for us to provide more protein of lower amino acid profiles generally, than lower amounts of protein of superior AA profile).
Phytase is an enzyme which helps make phytate phosphorus (that is, plant-based phosphorus) digestible by chickens, otherwise its almost useless to them. Since this formula already contains mineral (non-phytate) dicalcium phosphate, I'm again wondering why its inclusion is needed, except perhaps in an abundance of caution, to ensure the plant (corn, soy, wheat) sources are more effectively used.
@Egghead_Jr 's comments on sodium are spot on, I won't repeat them.
Anyhow, that's my amateur view based on a glance at the ingredients - hope it helps, don't think I skipped any?
