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Colegio de Postgraduados (COLPOS) Consejo Nacional de Ciencia y Tecnología (CONACYT) 2011

Análisis de la dieta de Cynomys mexicanus en convivencia con rumiantes y su impacto en el agostadero

Olvera Hernández, Abundio

Titre : Análisis de la dieta de Cynomys mexicanus en convivencia con rumiantes y su impacto en el agostadero

Auteur : Olvera Hernández, Abundio

Etablissement de soutenance : Colegio de Postgraduados (COLPOS) Consejo Nacional de Ciencia y Tecnología (CONACYT)

Grade : Doctorado 2011

Résumé
Diets of prairie dogs, goats, and sheep were examined by microhistological fecal analysis during four periods (seasons) of a year in a desert rangeland within northern Mexico. Prairie dogs selected more grasses (79 % across all seasons ; p < 0.05) than goats and sheep during most of the year. Total grasses in goat diets were consistent (20 %) in all seasons, whereas this forage class was highest during winter (72 %) and lowest during summer (62 %) in sheep diets. The diet of goats was predominantly shrubs (45 %-62 %) in all seasons whereas sheep and prairie dogs consumption showed little browsing throughout the study. All three species preferred forbs, which contributed about one-third to the composition of the prairie dog (winter), goats (summer), and sheep (spring) diets. Acacia greggii Gray and Opuntia rastrera Weber were the most preferred species by goats, whereas prairie dogs and sheep showed particular preference for Buchloe dactyloides (Nutt.) Engelm.andBouteloua gracilis (Willd. Ex Kunth) Lag.Ex Griffiths. During summer and spring, concentration of nitrogen in the feces of sheep was 36 % and 17 % higher (P < 0.05) than in feces of goats. There was a high overlap in diets between prairie dog and sheep for all seasons, whereas diets of prairie dog and goats, and goats and sheep were significantly different from each other in all seasons. These results showed that competition was keen between prairie dogs and sheep for a limited quantity of forage in this arid zone pasture, whereas goats were better able to use common resources with prairie dogs

Mots clés : Análisis microhistológico. Traslape de dieta. Selección de alimento. Pequeños rumiantes. Analysis fecal microhistological. Overlap. Selection of feed. Small ruminant. Ganadería.

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