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Titre : Variación estacional del perfil nutritivo y digestibilidad in SITU de materia seca, proteína cruda y fibra detergente neutro, del follajede ocho especies arbustivas del noreste de México

Auteur : Moya Rodríguez, José Guadalupe

Etablissement de soutenance : Universidad Autónoma de Nuevo León (UANL)

Grade : Doctorado en Ciencias Biológicas con Especialidad en Botánica 2002

Résumé
The foliage of Acacia wrightii Benth., Bumelia celastrina H.B.K., Castela texana T. & G. Rose, Forestiera angustifolia Torn, Karwinskia humboldtiana (R. & S.) Zucc., Larrea tridentata DC., Schaefferia cuneifolia Gray, and Zanthoxylum fagara (L.) Sarg., were evaluated to determine the content of dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), cellulose, hemicellulose, Jignin, tannins, ash, insoluble ash, gross energy (BE), macro and microminerals, effective degradability of DM, effective degradability of CP and effective degradability of NDF ; during the four stations of 1999, using as a reference forage Medicago sativa L. hay (alfalfa). The foliage of the evaluated species was collected in aleatory form, during the four stations of the year of 1999, in three places located in the cunties of Hualahuises, Carmen and Mina, of the state of Nuevo León, México. In most of the species evaluated, the nutrient content varied significantly during the four stations of the year. The content of tannins (an antinutrimental factor) in the evaluated species, was higher in winter and autumn. The EDDM, of F. angustifolia (72.3%) and Z. fagara (68.1%), were superior to M. sativa (67.6%) ; while that C. texana (62.2%), L tridentata (61.5%), S. cuneifolia (60.5%). K. humboldtiana (60.4%) and A. wrightii (56.0%), were inferior. The EDCP of S. cuneifolia (82.5%), C. texana (73.1%), Z. fagara (72.8%) and A. wrightii (72.1%), were superior or compatible to M. sativa (75.1%). Forestiera angustifolia (61.3%) and K. humboldtiana (54.2%) had superior levels EDNDF to M. sativa (53.7%), while the rest of the shrubs presented inferior levels. During the four seasons, most of the shrubs had a content of Ca, Mg, K, Cu, Mn, Fe and Zn according with the nutritional requirements of the goats ; however were deficient in P and Na. To have a superior or very near EDCP to the shown by M. sativa (75.1%), it is considered that the foliage of S. cuneifolia (82.5%), C. texana (73.1%), Z. fagara (72.8%) and A. wrightii 72A%), can be used as a good supplement proteinous, so much for ruminant in shepherding like for animals of wild life, mainly during the forage shortage in low water time.

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