Abstract

SALGADO-MORENO, Socorro; CARRILLO-DIAZ, Fernando; ESCALERA-VALENTE, Francisco  and  DELGADO-CAMARENA, Cindy. Tests to identify resistant sheep to gastrointestinal parasites in San Pedro Lagunillas Nayarit. Abanico vet [online]. 2017, vol.7, n.3, pp.63-71. ISSN 2448-6132.  https://doi.org/10.21929/abavet2017.73.7.

The present work was carried out to determine the animals resistant to gastroenteric nematodes in Pelibuey sheep. 40 naturally infected ewes without deworming were sampled every 15 days for a year. The FAMACHA method was used to detect anemic animals when they were infested predominantly by Haemonchus contortus, blood samples were taken to make microhematocrit and stool samples to determine the existing parasites and the parasite load. The samples were processed in the Laboratories of Parasitology and Clinical Analysis of the Academic Unit of Veterinary Medicine of the UAN. The values of hematocrit, parasite load, body condition and FAMACHA score were used to determine the resistance condition. It is concluded that the herd under study maintained a state of resistance to gastrointestinal nematodes (70.5%) throughout the year. In addition, it was evidenced that during the seasons of the year, the herd showed more sensibility in summer and greater resistance in Autumn-Winter.

Keywords : resistance; FAMACHA^©; gastrointestinal parasites; sheep.

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