Chemical composition, nutritive value and voluntary intake of tropical tree foliage and cocoyam in pigs

Abstract

Abstract The composition of the leaves of cocoyam ( Xanthosoma sagittifolium ) and of two trees ( Trichanthera gigantea and mulberry, Morus alba ), their nutritive value in pigs and voluntary intake by pigs were determined. The average protein content ranged from 170 to 240 g kg −1 dry matter (DM) and that of neutral detergent fibres from 218 to 398 g kg −1 DM. The leaves are interesting sources of calcium (up to 69 g kg −1 DM), potassium, iron and manganese. The proteins are well balanced in essential amino acids, with lysine ranging from 43 to 57 g kg −1 proteins. The apparent faecal digestibility was determined by difference in 35 kg pigs fed a diet containing 35% leaf meal. The digestibility coefficients of DM, N and energy were, respectively, 47–57, 33–36 and 51–53%. The digestible energy value ranged from 1.674 to 2.037 kcal kg −1 DM. The voluntary intake of Trichanthera and Xanthosoma was measured in sows weighing 100 kg on average. The intake reached 3.4 kg fresh leaves day −1 (0.51 kg DM) and 1.0–1.1 kg dry leaf meal/day. It is concluded that low energy density is the main limiting factor of tree foliage for pig nutrition but that they are good sources of minerals and well‐balanced proteins. Copyright © 2005 Society of Chemical Industry