Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Suède → Assessment of nematode parasitism and clinical parameters in goats and sheep in Mongolia.

Swedish University of Agricultural Sciences (2017)

Assessment of nematode parasitism and clinical parameters in goats and sheep in Mongolia.

Ek Terlecki, Frida

Titre : Assessment of nematode parasitism and clinical parameters in goats and sheep in Mongolia.

Auteur : Ek Terlecki, Frida

Université de soutenance : Swedish University of Agricultural Sciences

Grade : Master Second cycle, A2E 2017

Résumé
Haemonchus contortus is one of the most pathogenic gastrointestinal parasites of small ruminants in the world and causes major losses and animal welfare issues in the animal husbandry. In Mongolia, over a third of the population lives as pastoral herders and relies largely on animal husbandry for food, and livestock production plays an important role in the national economy. The aim of this study was to compare the occurrence of H. contortus in goats and sheep in different environments ; desert, grassland and forest steppe. This was done by investigating the occurrence of trichostrongylid eggs and the variations in the clinical parameters in the different locations and host species. Species identification of H. contortus was unsuccessful due to complications in the PCR analysis. The study was conducted on 88 heads of goats and 80 heads of sheep from 3 different locations in Mongolia ; South Gobi, Bayan Unjuul and Khuvsgul. Faecal and blood samples were collected and FAMACHA© and BCS were estimated for every individual. The faeces were analysed for trichostrongylid eggs (FEC), and blood samples were analysed for haemoglobin and PCV. The FEC of trichostrongylid eggs showed that 98.2 % of the sampled animals indicated no or low worm burdens, with a mean FEC of 68.8 (± 108.3 SD) for sheep and 67.6 (± 108.8 SD) EPG for goats. Mean FEC of trichostrongylid eggs was significantly lower in the desert region (South Gobi), which is in accordance with previous research in Mongolia. In contrast to previous research, no correlation was found between FEC of trichostrongylid eggs and FAMACHA©. There were host species differences for FAMACHA©, haemoglobin values below reference level and in animals with BCS ≤2.5. Goats scored higher on mean FAMACHA© and had a higher occurrence of animals below reference level for FAMACHA©, haemoglobin and BCS. Differences in locations were found in goats for FAMACHA© >3, haemoglobin values below reference level and BCS. Goats in South Gobi had a high occurrence of values that deviate from the normal range for FAMACHA© and haemoglobin, and with lower mean BCS, differing significantly from goats in other locations. In line with previous studies, there was a significant negative correlations between haemoglobin values and FAMACHA© (r = -0.03) as well as between PCV and FAMACHA© (r = -0.58) in this study. However, no correlation was found between FAMACHA© and BCS in contrast to a previous study. Species differences were found between common clinical parameters such as FAMACHA©, haemoglobin values and BCS. South Gobi appears to be a less beneficial location for goats, as the clinical parameters have a higher occurrence of values outside the normal range there. However, the causal relationships between the studied clinical parameters and parasitism could not be verified and require further research.

Mots Clés  : nematodes, Mongolia, sheep, goats

Présentation

Version intégrale (1 Mb)

Page publiée le 7 juin 2020