Abstract
To examine the association between phytase and xylanase in diets with nutritional adjustments on intestinal morphometry, serum biochemistry and microbiology of broilers, 250 broilers were evaluated in a completely randomized design with five treatments and five replicates. The following treatments were tested: positive control diet - without phytase or xylanase; negative control diet - with an energy reduction of 100 kcal/kg, without phytase or xylanase; and three diets containing xylanase and phytase and energy reductions of 50, 100 and 150 Kcal/kg. For all energy-reduced diets, the nutritional matrix of phytase with phosphorus (0.15%), calcium (0.165%) and sodium (0.035%) was considered. An effect of the association between enzyme inclusion and metabolizable energy reduction in the diets was observed only by contrast analysis, for villus height. Intestinal health was not changed. Only the serum phosphorus concentration was altered by the treatments at the different evaluated ages. The association of phytase (500 FTU/kg) with xylanase (16000 BXU/kg) in diets with reductions of up to 150 Kcal/kg metabolizable energy, 0.15% digestible P, 0.165% Ca and 0.035% Na does not alter the intestinal morphometry, serum biochemistry or microbiology of broilers.
Highlights
In recent years, broiler performance has been enhanced by maximizing the metabolizability of corn- and soybean-meal based diets with the use of highly specialized exogenous enzymes, phytase and xylanase
Associating intestinal health data with the serum biochemical profile can provide relevant information about the metabolism of broilers and elucidate the effect of exogenous enzymes added to diets on their health, especially when the nutritional matrix of each enzyme is considered in formulations
This study examines the association between phytase and xylanase in diets with nutritional adjustments on the intestinal morphometry, serum biochemistry and microbiology of broilers
Summary
Broiler performance has been enhanced by maximizing the metabolizability of corn- and soybean-meal based diets with the use of highly specialized exogenous enzymes, phytase and xylanase These enzymes act on phytates and non-starch polysaccharides (NSPs), respectively (Vaz et al 2013, Schramm et al 2017), two of the main antinutritional factors present in grains (Rostagno et al 2017). High levels of calcium (Ca) and sodium (Na) can interact with other minerals (iron, magnesium and zinc) and endogenous amino acids, respectively, making them unavailable for absorption and masking the effect of phytase (Qian et al 1997, Cowieson et al 2011) On these bases, this study examines the association between phytase and xylanase in diets with nutritional adjustments on the intestinal morphometry, serum biochemistry and microbiology of broilers
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