<b>Effect of phytase on digestibility of corn, sorghum and wheat bran by silver catfish (<i>Rhamdia voulezi</i>)

Abstract

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).Keywords: feeding, enzyme, plant energetic ingredients, silver catfish.Efeito da fitase sobre a digestibilidade do milho, sorgo e farelo de trigo pelo jundiá (Rhamdia voulezi) RESUMO. O objetivo do presente estudo foi avaliar a digestibilidade dos ingredientes energéticos vegetais, milho, sorgo e farelo de trigo, com e sem suplementação de fitase pelo jundiá (Rhamdia voulezi). O delineamento experimental foi inteiramente casualizado, representado por oito tratamentos, os quais consistiram na elaboração de uma dieta-referência e uma dieta-teste para cada ingrediente avaliado (milho, sorgo e farelo de trigo), com e sem a suplementação de fitase. As dietas foram fabricadas de modo que continham 70% da ração referência e 30% do ingrediente teste. Os coeficientes de digestibilidade da matéria seca e proteína bruta foram influenciados significativamente somente em relação aos ingredientes avaliados. A fitase influenciou nos coeficientes de digestibilidade da energia e do fósforo, onde também foi observada a interação entre os alimentos e a inclusão da enzima. A interação entre esses dois fatores demonstra que a eficiência da fitase é dependente do tipo de ingrediente vegetal utilizado na dieta. Pelos resultados obtidos sugere-se a suplementação de fitase visando maior digestibilidade dos nutrientes, do milho, sorgo e farelo de trigo pelo jundiá (R. voulezi).Palavras-chave: alimentação, enzima, ingredientes energéticos vegetais, jundiá.

Replacement of corn by sorghum and phytase supplementation in silver catfish (Rhamdia quelen) diets: growth performance, physiological variables and bone mineralization

“…Sorghum-based diets supplemented with phytase provided higher contents of visceral fat. This fact may have occurred due to the higher energetic availability of sorghum that the silver catfish absorbed, which consequently resulted in higher accumulation of fat, as suggested by Signor et al (2016).…”

Nutrition and Feeding Aspects for Jundiá (Rhamdia quelen) Rhamdia quelen Nutrition and Feeding

“…The digestibility of plant energy ingredients, namely, corn, sorghum and wheat bran, with and without phytase supplementation, was evaluated, and suggested that phytase supplementation should be applied, aiming at a greater digestibility of the nutrients obtained from these ingredients by jundiá (Signor et al . ). Phytase supplementation becomes necessary because fish do not possess this enzyme, making it impossible to take advantage of phytate nutrients (Sajjadi & Carter ).…”

“…The hydrolysis promoted by the addition of phytase allows for a greater amount of nutrients to become available for absorption and use (Signor et al . ). Lewandowski et al .…”

Mineral digestibility of different animal sources for the silver catfish Rhamdia voulezi

“…Although several studies evaluating the digestibility of different sources of ingredients have recently been run (Oliveira-Filho & Fracalossi 2006, Signor et al 2016, Lewandowski et al 2017, Friesa et al 2020, no studies are evaluating the mineral digestibility in animal by-products meal. Thus, to improve information on digestibility and enhancement of diet formulations, this study aimed to evaluate the digestibility of minerals, dry matter, crude protein, and gross energy of marine fish meal, salmon meal, tilapia by-product meal, meat and bone meal, poultry by-product meal, blood meal, and feather meal for silver catfish.…”