Abstract

GARCIA, D.E et al. Phytochemical variability and potential antinutritional repercussion in species of the Albizia genus. Pastos y Forrajes [online]. 2007, vol.30, n.1, pp.1-1. ISSN 0864-0394.

By means of the analyses of main components (MCA), automatic classification (ACA) and simple variance (ANOVA), the spectrum of variations of the chemical composition of eleven species of the Albizia genus (A. berteriana, A. caribaea, A. cubana, A. falcata, A. kalkora, A. lebbeck, A. lucida, A. procera, A. saman, A. semani and A. odoratissima), established in the arboretum of the EEPF “Indio Hatuey” in Matanzas, Cuba, was studied. The bromatological indicators evaluated were: CP, NDF, P, K, Na, Ca, Mg, ash and soluble carbohydrates (SCH); while the concentrations of total polyphenols TP, protein precipitable tannins (PPT), condensed tannins (CT), alkaloids (Alk), saponins (Sap) and non-alkaloidal nitrogen salts (NANS) described the phytochemical particularities. A high variability was detected for the first three components in the bromatological and phytochemical indicators (71,19 and 81,95%, respectively). The ACA allowed to identify four groups in both cases. The variables that better accounted for the variance were the contents of K, Ca, ash, SCH, TP, PPT and CT. It is concluded that, independently from the fact that the species showed particular characteristics in their proximal composition, all of them presented an acceptable bromatological composition. The trees may be divided according to their essentially polyphenolic (A. berteriana, A. cubana, A. falcata, A. kalkora and A. lucida) or saponinic characteristics (A. caribaea, A. procera and A. saman), with high concentrations of phenols and Sap (A. odoratissima), or the presence of low contents of these latter metabolites (A. lebbeck and A. semani). From the nutritional point of view A. lebbeck, A. semani, A. caribaea, A. procera and A. saman constitute the best choices for feeding ruminants, and only A. lebbeck and A. semani show potentialities for monogastric animals.

Keywords : Albizia; antimetabolites; saponins; tannins.

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