Resumen

LOPEZ RUVALCABA, Omar Andrés et al. Gastrointestinal nematodes burden and prevalent species in hair sheep for slaughter. Rev. mex. de cienc. pecuarias [online]. 2013, vol.4, n.2, pp.223-234. ISSN 2448-6698.

The aim of this work was to determine the prevalence and gastrointestinal nematodes (gin) burden in hair sheep for slaughter. The study was carried out in a slaughterhouse in Villahermosa, Tabasco. Gastrointestinal contents from 122 sheep were analyzed. The animals came from different municipalities of Tabasco (Centro, Emiliano Zapata, Centla, Huimanguillo Teapa) and Chiapas (Reforma). The GLM procedure of SAS was used to analyze the adult nematode counts and counts by species respect to the age, sex, physiological status and sampling month. Haemonchus contortus, Trichostrongylus colubriformis and Cooperia curticei were the principal nematodes species found in this study and showed the presence of the cestode Moniezia expansa. 41 % (50/122) of the animals sampled had any of the above parasites. The highest percentage of parasitized sheep occurred in Centro (40 %, 19/47) and Huimanguillo (54 %, 22/ 41). The discarded males (8/64) had the highest number of gin (2190 ± 3263). Of ewes (58/122) the open (40/58) had the highest amount of gin (486 ± 1120). In sheep from 31 to 36 mo of age, parasite burdens (49 ± 143) were lower than in animals of all other ages. It was conclude that in the study population age, sex and physiological status affected the number of adult nematodes prevalent in the host.

Palabras llave : Haemonchus contortus; Cooperia curticei; Trichostrongylus colubriformis; Nematodes; Parasitism.

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