Abstract
The objectives of this study were to evaluate the digestibility of the nutrients of simplified and semi-simplified diets, with and without inclusion of exogenous enzymes and to determine the nutritional value of the fibrous sources. The tested feedstuffs were: alfalfa hay, hay from the upper third of the cassava foliage and cassava leaf meal, using a completely randomized design with 11 diets and 8 repetitions. The treatments were constituted of 1 reference diet, 2 simplified diets and 8 semi-simplified diets (4 enzymatic inclusion). The enzymes used were carbohydrases (alpha-galactosidase, galactomanose, xylanase and beta glucanase) and phytase. It was observed that the digestibility of the nutrients of the diets was influenced by the type of feed studied. Semi-simplified diets presented coefficients inferior to the reference diet and superior to the simplified diets. Exogenous enzymes promoted improvements in the digestibility of the dry matter (DM), organic matter, crude protein and gross energy. It was also observed that great part of the crude protein of the cassava leaf meal complexed, which depreciated the digestibility of diets with high inclusion of this ingredient. The nutritional value of fibrous sources was 1822.7 kcal digestible energy - DE/kgDM and 122,6 g digestible protein - DP/kg DM, for the hay from the upper third of the cassava foliage; 2232.5 kcalDE/kgDM and 155.4 gDP/kgDM for alfalfa hay and 1888.9 kcalDE/kgDM and 73.6 gDP/kgDM for the cassava leaf meal. With the exception of diets with elevated inclusion of cassava leaf meal, the semi-simplified diets presented satisfactory coefficients of digestibility improved by the enzymatic inclusion.
Highlights
The study of the digestive efficiency of feedstuffs begins with the quantification of nutritional principles, followed by the determination of digestibility and animal performance coefficients (Santos et al, 2004)
The objectives of this study were to evaluate the digestibility of the nutrients of simplified and semisimplified diets, with and without inclusion of exogenous enzymes and to determine the nutritional value of the fibrous sources
It was observed that great part of the crude protein of the cassava leaf meal complexed, which depreciated the digestibility of diets with high inclusion of this ingredient
Summary
The study of the digestive efficiency of feedstuffs begins with the quantification of nutritional principles, followed by the determination of digestibility and animal performance coefficients (Santos et al, 2004). As quoted by Cheek et al (1986) and Gidenne (2000) the rabbit has a low utilization of the fiber fraction due to the rapid passage of feed through the gastrointestinal tract. The digestibility of nutrients, especially protein, is incremented (Carabaño et al, 1988; Carabaño & Piquer, 1998; Machado et al, 2007; Faria et al, 2008). Simplified and semi-simplified diets are a new technology which associates economy, provided by the high inclusion of a fibrous ingredient (Machado et al, 2007). Alfalfa is a fiber source generally used in rabbit diets. In Brazil, alfalfa hay is extremely expensive. The aerial part of the cassava is a potential substitute for alfalfa hay. As observed by Flores (1998) the aerial part of the cassava presents high
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