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Universidade de Tras os Montes E Alto Douro (2019)

Nutritional valorization of cowpea (Vigna unguiculata) coproduct for animal feeding

Andrade, Ederson Américo de

Titre : Nutritional valorization of cowpea (Vigna unguiculata) coproduct for animal feeding

Auteur : Andrade, Ederson Américo de

Université de soutenance : Universidade de Tras os Montes E Alto Douro

Grade : Ph.D. in Animal Science 2019

Résumé partiel
Nutritional valorization of cowpea (Vigna unguiculata) co-product for animal feeding The concept of circular economy is considered a sustainable principle for the reuse of underutilized agro-industrial co-products by shielding global markets against scarcity of resources and volatility of prices. Agro-industrial co-products are of low economic value as foods for human consumption but may have potential value as animal feedstuff, and in the Mediterranean production systems, agricultural co-products have been used as an important feedstuff during periods of shortage of forage. Another possible utilization of these compounds relies on its inclusion on compound feeds, especially in rabbit production. The Eurolegume project, in which this thesis is developed, evaluated cowpea (Vigna unguiculata), pea (Pisum sativum) and fava (Vicia faba) local genetic resources for the development of new varieties for food and feed. Management and valorization of residual biomass for animal feed were also evaluated in the project and created the opportunity to enrol on a PhD program and develop this thesis. Cowpea stover has been shown to be a feedstuff with high cell wall content (666 g kg-1 DM), moderate protein value (121 g kg-1 DM) and high lignin content (109 g kg-1 DM) which in turn influence in vitro digestibility values for rabbits (396 g kg-1 OM) and ruminants (603 g kg-1 OM) and in sacco degradability for ruminants (Chapter 1). The leaves of the cowpea stover showed to be the fraction with high nutritional value and its conservation is considered important. Based on these results the thesis advances in two lines of research to evaluate the potential of cowpea stover as animal feed : 1) potential use of cowpea stover treated/untreated with white-rot fungi for animal feeding and 2) conservation of the mixture’s treated/untreated cowpea stover and discarded apple by the ensilage process. In Chapter 2 we evaluated the effect of the incorporation of 0, 20 and 40 g kg-1 of untreated cowpea stover in compound feed on the coefficients of total tract apparent digestibility of organic matter, crude protein, neutral detergent fibre and gross energy of growing rabbits. Cowpea stover presented a good potential to be used in rabbit feeding as its inclusion in the experimental diets up to 40 g kg-1 did not affect growth performances. However, its inclusion showed to negatively influence protein digestibility values, indicating that its inclusion should be further evaluated so that these possible detrimental effects could be overcome. In this way, chemical or biological pre-treatment of cowpea stover should also be considered as they might improve the digestibility of this feedstuff. As white-rot fungi degrade lignin efficiently, due their extracellular enzymatic system and hyphal penetration power, its potential to improve the nutritive value of cowpea stover was studied.


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