For poultry species, the waste from digestion (faecal sample) and waste from metabolism (uric acid) are egested together. Bearing in mind the fact that uric acid is a waste product of metabolism that is not retained and is not usually separated when faecal samples are collected, it will be inappropriate to say the calculation therein represent digestibility alone after all digestibility starts and end in the gastrointestinal tract. The uric acid is actually from the kidney.
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It may seem that the time has come to do this, that is, in poultry nutrition, instead of the percentage of food digestibility, the ability to retain nutrients in the body is considered as a criterion. Because the nutrients in the poultry's body are in addition to the food they consume, they come from eating feces and eating junk.
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