Abstract
Chemical composition of some potential forages species, natives from Caatinga region, were evaluated. Samples of <em>Macroptilium heterophyllum</em>, <em>Stylosanthes humilis</em>, <em>Rhynchosia</em><strong> </strong><em>mÃnima</em>, <em>Desmodium tortuosum </em>Sw. Dc, <em>Merremia aegyptia,</em> <em>Mimosa tenuiflora</em> Wild, <em>Bauhinia cheilantha</em> and as well <em>Macroptilium lathyroides</em>, <em>Caesalpinia pyramidalis </em>and <em>Mimosa tenuiflora</em> hays were collected in Rio Grande do Norte Stated, during 2011 rainy season. The analyses: dry matter (DM), crude protein (CP) mineral matter (MM) ether extract (EE) neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin (LIG), insoluble neutral detergent nitrogen, (INDN) insoluble acid detergent nitrogen, (ADIN), total phenol (TF) and total tannin (TT) were done at Embrapa Caprinos e Ovinos in Ceará State. Plants analyzed, as expected, for tropical species, exhibited high level of cell wall constituents, high lignifications rate and revealed substantial presence of anti nutritional compounds. However, regardless of this data, the main problem, for grazing animals, is due to its xerophytes characteristics. Most of the shrubs and trees are deciduous, losing its leaves during the dry season. In addition, herbaceous presents a very rapid lifetime cycle, germinating and senescing during the brief wet season.
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