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Ileal digestibility of amino acids of cassava, sweet potato, cocoyam and erythrina foliages fed to growing pigs

Published online by Cambridge University Press:  14 October 2011

C. Régnier ,
Y. Jaguelin ,
J. Noblet  and
D. Renaudeau
C. Régnier
Affiliation:
INRA, UR 143 Unité de Recherches Zootechniques, F-97170 Petit Bourg, Guadeloupe, France
Y. Jaguelin
Affiliation:
INRA, UMR 1079 Systèmes d'Elevage, Nutrition Animale et Humaine, F-35590 St Gilles, France
J. Noblet*
Affiliation:
INRA, UMR 1079 Systèmes d'Elevage, Nutrition Animale et Humaine, F-35590 St Gilles, France
D. Renaudeau
Affiliation:
INRA, UR 143 Unité de Recherches Zootechniques, F-97170 Petit Bourg, Guadeloupe, France
*
†E-mail: Jean.Noblet@rennes.inra.fr
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Abstract

Ileal digestibility in growing pigs fed starch-based diets with inclusion of four tropical leaves in a meal form was studied in a 5 × 5 Latin square design. Five diets were formulated with only casein as protein source in the basal diet (CAS), and casein plus dry cassava (CA) leaves, casein plus dry sweet potato (SP) leaves, casein plus dry cocoyam (CO) leaves and casein plus erythrina (ER) leaves in the other four diets. All diets contained the same amount of CP (14%), either provided by only CAS or a combination of casein and 250 g of leaf meal per kg of diet in the other diets. Leaves were separated manually from stems, and only the leaf part was used. A protein-free diet was fed during a sixth period in order to estimate the endogenous protein losses and calculate the CP- and amino-acid (AA)-standardized ileal digestibility (SID) values. The values for the foliages were calculated according to the difference method, assuming no interaction between the foliage and the casein. The ileal tract apparent digestibility of CP, organic matter and energy was higher in diet CAS than in the other diets (P < 0.05). The SID of CP and AA was close to 0.950 for casein, whereas the SID of AA was markedly lower in the foliages; the SID of indispensable and dispensable AA was highest in CO (0.500 and 0.352) and lowest in ER (0.170 and 0.195); intermediate values were obtained for SPs (0.367 and 0.349) and CA (0.232 and 0.242) leaves. Accordingly, the SID of lysine was highest (0.538) for CO leaves and lowest (0.126) in ER leaves; intermediate values were measured for CA and SP leaves. These low SID values in foliage meals must be related to the high levels of dietary fibre and the presence of secondary metabolites (tannins). These results suggest that it is only possible to replace a fraction of the conventional protein sources such as soyabean meal by tropical foliages in growing pig diets with a preference for CO leaves.

Keywords

cassavasweet potatoescocoyamerythrinaileal digestibility
Type
Full Paper
Information
animal , Volume 6 , Issue 4 , April 2012 , pp. 586 - 593
Copyright
Copyright © The Animal Consortium 2011

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