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Universidade de Sao Paulo Brésil (2006)

Valor nutricional de espécies arbóreo-arbustivas nativas da caatinga e utilização de tratamentos físico-químicos para redução do teor de taninos

Nozella Eduardo Fernando

Titre : Valor nutricional de espécies arbóreo-arbustivas nativas da caatinga e utilização de tratamentos físico-químicos para redução do teor de taninos

Auteur : Eduardo Fernando Nozella

Université de soutenance : Universidade de Sao Paulo

Grade : Doctor 2006

Résumé
The typical vegetation of the semi-arid region of northeast Brazil is considered an important source of protein for the animals, mainly during the dry season. However, the chemical composition of the plants, as fiber, protein and secondary compounds change during the year with the different stage of the plants. The tannin concentration varies according to climatic and geographic conditions. The aims of this study were : (i) to evaluate the chemical composition of plants of three regions in the northeast Brazil ; (ii) to verify the effect of tannins on gas production ; (iii) to use detanification methods to improve the nutritional value of those plants. The study contains three chapters. In the first chapter, the following species of plants from Pernambuco, Bahia and Ceara were evaluated by chemical analysis and gas production : angico - Anadenanthera macrocarpa, aroeira - Astronian urundeuva, catingueira - Caesalpinia bracteosa, jucazeiro - Caesalpinia ferre, jurema preta - Mimosa hostilis, leucena - Leucaena leucocephala, malva branca - Sida cordifolia, manicoba - Manihot pseudoglaziovii, pau branco - Auxemma oncocalyx and sabia - Mimosa caesalpinifolia. In the second and third chapters various detanification methods were tested, as drying processes and application of alkaline solutions (wood ash and calcium hydroxide) and polyethylene glycol application. The chemical analysis showed that all the plants studied could be used as animal feed, but the phenolics contents could be a detrimental factor and should be monitored. The drying methods were not efficient to minimize tannin effects as showed using the gas production. The treatment with wood ash, calcium hydroxide and polyethylene glycol resulted in a decrease of tannins concentration, but only polyethylene glycol treatment decreased tannins activity during the gas production.

Mots clés  : Análises de taninos ; Fenóis ; Gas production ; Leguminosas tropicais ; Phenolics ; Polietileno glicol ; Polyethylene glycol ; Produção de gases ; Tannin assays ; Tropical legumes ; Energia Nuclear na Agricultura

Présentation (RCAAP)

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Page publiée le 15 avril 2009, mise à jour le 6 juillet 2017