Phenotypic expression of parasite susceptibility to Haemonchus contortus in Pelibuey sheep

Veterinary Parasitology
N F Ojeda-RobertosD R Notter

Abstract

The objective of this study was to determine if the mean faecal egg count (FEC) from a first experimental Haemonchus contortus infection could be used to classify parasite-naïve Pelibuey hair sheep as parasite-resistant high responders and parasite-susceptible low responders. Twenty 6- to 7-month-old Pelibuey male sheep raised free of gastrointestinal nematodes were challenged with 7500±1412 H. contortus L3 larvae administrated orally on day 0 of the study. Faecal samples from each lamb were obtained daily from 21 to 41days post-infection (Stage I). Lambs received a second artificial infection of 8420±1545L3 larvae on day 42, with faecal samples collected from day 65 to day 78 (Stage III). The mean FEC for each lamb in Stage I was used to classify 8 lambs with means for FEC that were more than two standard errors (SE) below the overall mean (i.e., <4764 eggs per gram of feces; epg) as high responders. The remaining 12 lambs were classified as low responders. Means for FEC in Stage I were 2449±194 epg for high responders and 14,461±1044 epg for low responders (P<0.05). High responders also had lower FEC than low responders in Stage III (actual means of 650±220 vs. 5933±1990 epg; P<0.05 following log transformation to normalize t...Continue Reading

Citations

Jan 11, 2019·Parasitology Research·Claudia V Zaragoza-VeraAlma C Berumen-Alatorre
Mar 29, 2019·Journal of Animal Science and Biotechnology·Mahmuda Bilkis Bintee AlamShuhong Zhao
May 25, 2021·Veterinary Parasitology : Regional Studies and Reports·Jerónimo Sepúlveda-VázquezJuan Felipe de Jesús Torres-Acosta
Jun 14, 2021·Veterinary Parasitology·E Ramos-BrunoG I Ortiz-Ocampo

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