Fig. 3.
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Color reaction to the presence of ammonia in the feather hydrolyzate, feather meal and blood meal, depending on the level of total volatile nitrogen in these samples (mg 100 g−1): 1 – 85–300 for hydrolyzed feather meal, 85–105 for feather meal 40–105 for blood meal; 2. – more than 300 for hydrolyzed feather meal and more than 130 for feather meal and blood meal.
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