Chemical composition and protein degradability of native forages of the semiarid region of northern Mexico
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Abstract
(2), shrubs (11), herbaceous plants (4), cactuses (3), flowers, fruits, and pods (8), consumed by small ruminants under pasture ground
conditions, were estimated. The chemical composition was determined by standard methods, and the ME, from the in vitro gas production
and the in situ CP degradability. The data were subject to analysis of variance for a completely randomized design, and the chemical composition was correlated with the CP degradability. The contents of NDF (65, 41, 46, 43, and 37 % DM, respectively), lignin (10, 8, 12,
2, and 7 % DM), hemicellulose (32, 18, 13, 30, and 10 % DM), cellulose (22, 16, 21, 11, and 20 % DM), ME (4.6, 6.6, 8.5, 7.3, and
7.8 MJ/kg DM), MP (4.9, 7.7, 7.3, 2.9, and 4.5 % DM), as well as the constant rate of degradation c of the CP (4.0 % h-1, 6.4, 4.4, 3.7, 8.7)
and the effective degradability of the CP (28, 55, 62, 77, and 76 %) were different in each set of plants. It is concluded that the nutritional value (ME and MP) of trees and herbaceous plants is high, as well as the cactuses and fruits in regards to ME. The constant rate of degradation c of the CP of fruits, trees, and herbaceous plants provide them with good nutritive potential for small ruminants under feedlot conditions. On the contrary, the effective degradability of CP allows classifying the trees under study as species of middle quality.
Key words: native plants, metabolizable energy, metabolizable protein, semi-desert, Mexico.
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