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Six tree species (Diphysa robinioides, Gliricidia sepium, Erythrina americana, Bursera simaruba, Bambusa vulgaris and Zanthoxylum riedelianum) were investigated for in situ ruminal dry matter degradation, and effective degradability at three passage rates, in Veracruz, Mexico. Leaves, stems and petioles were randomly collected from trees during dry and rainy seasons to estimate, dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), and in situ DM degradation using the nylon-bag technique. Ruminal degradation of organic matter, crude protein (ISCPD) and effective dry matter degradability (ED) were also calculated. The trial was a completely randomized design with a split-plot arrangement of factors, being the main plot factor the species, and the sub-plot factor the season. Legume trees showed the highest CP values for both dry (23.2–18.5%) and rainy seasons (24.2–19.8%). Organic matter showed less variability, which ranged in all species from 87.6% to 93.1%. For NDF during both seasons, B. vulgaris had the highest value (68.5%) contrary to D. robinioides: 36.8%. The highest degradation potential (a + b) and ED corresponded to D. robinioides (80.5% y 65.3%) and G. sepium (78.4% y 66.6%) species, respectively, for both seasons. OM ruminal degradation (ISOMD) averaged 46.9% for the six tree species. For ISCPD, no differences among species were found (P ≥ 0.05), and G. sepium had the highest values (90.5%). Based on the moderate to high CP values and the degradation characteristics, the assessed species constitute an alternative supply for different animal production systems, especially during the dry season. © 2018, Springer Science+Business Media B.V., part of Springer Nature.
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