Abstract
This study aimed to evaluate the digestibility of plant energetic ingredients, corn, sorghum and wheat bran, with and without phytase supplementation, in silver catfish (Rhamdia voulezi). The experimental design was completely randomized, represented by eight treatments, which consisted of the development of a reference diet and a test diet for each ingredient evaluated (corn, sorghum and wheat bran), with and without supplemental phytase. Diets were formulated so as to contain 70% reference feed and 30% test ingredient. The digestibility coefficients of dry matter and crude protein were significantly influenced only in relation to the evaluated ingredients. Phytase influenced the digestibility coefficients of energy and phosphorus, with interaction between food and the enzyme addition. The interaction between these two factors shows that the phytase efficiency is dependent on the type of vegetable ingredient used in the diet. The results suggest the supplementation of phytase for a higher nutrient digestibility of corn, sorghum and wheat bran by silver catifish (R. voulezi).
Highlights
Phytate or phytic acid is an anti-nutritional factor present in plant ingredients, formed by a myo-inositol ring containing six phosphate groups, its main function is the storage of phosphorus (National Research Council [NRC], 2011)
Salts and complexes formed are not absorbed in the digestive tract of monogastric animals, including fish, since they cannot be solubilized at pH near that of the intestine (Greiner & Konietzny, 2006) affecting the variables of animal performance
This is because these animals do not have endogenous phytase in the gastrointestinal tract, which is responsible for gradual hydrolysis of the phytic acid molecule through a series of dephosphorylation reactions, resulting in a myo-inositol molecule and free phosphate (Sajjadi & Carter, 2004)
Summary
Phytate or phytic acid is an anti-nutritional factor present in plant ingredients, formed by a myo-inositol ring containing six phosphate groups, its main function is the storage of phosphorus (National Research Council [NRC], 2011). Salts and complexes formed are not absorbed in the digestive tract of monogastric animals, including fish, since they cannot be solubilized at pH near that of the intestine (Greiner & Konietzny, 2006) affecting the variables of animal performance This is because these animals do not have endogenous phytase in the gastrointestinal tract, which is responsible for gradual hydrolysis of the phytic acid molecule through a series of dephosphorylation reactions, resulting in a myo-inositol molecule and free phosphate (Sajjadi & Carter, 2004). Nutrients before complexed become available to be absorbed and utilized by the organism
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