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

Accueil du site → Doctorat → Autriche → Genetic differentiation and metabolic adaptation of cattle populations along the slopes of Simien Mountains of North Western Ethiopia

Universität für Bodenkultur Wien (2010)

Genetic differentiation and metabolic adaptation of cattle populations along the slopes of Simien Mountains of North Western Ethiopia

Gebeyehu, Zewdu Wuletaw

Titre : Genetic differentiation and metabolic adaptation of cattle populations along the slopes of Simien Mountains of North Western Ethiopia

Auteur : Gebeyehu, Zewdu Wuletaw

Université de soutenance : Universität für Bodenkultur Wien

Grade : Dr. nat. techn. 2010

Résumé
Sustainable utilization of animal genetic resources demands comprehensive characterization of the intended genotypes. Here an effort is made to investigate cattle breeds of North Western Ethiopia in terms of genetic distances and adaptive attributes. First we investigated altitude adaptation of indigenous and crossbred cattle populations found in the altitude range of 1700 - 3500 m. A total of 218 animals were tested for their pulmonary artery pressure, percent arterial oxygen saturation, and 672 animals for haematological parameters. Results show that no sign of pulmonary hypertension was observed among all the cattle genotypes. Low % SaO2 and absence of hematopoiesia (red blood cells and Hemoglobin) were also evidenced as typical features of the high altitude cattle. Further analysis of histological data of muscular pulmonary arteries revealed that these cattle do have thick percent medial thickness but wider lumen. We suggested that, Simien cattle have benefited special mode of adaptation to high altitude hypoxia probably due to its anatomical feature (wider lumen) of distal pulmonary arteries. Analysis of genetic variability of these populations using microsatellite markers confirmed little but significant genetic differentiation and inbreeding with out evidence for recent bottleneck. Although further molecular analysis evidenced two major clusters, the populations exhibited high within breed genetic diversity, which is important for future breed improvement. Thus, it is concluded that adopting effective breeding and management practices while maintaining their adaptive attributes is the most sustainable way to facilitate conservation and utilization of these cattle resources

Mots clés : Anpassung / Rind / genetische Diveristät / Histologie / Sauerstoffsättigung / Äthiopien — Adaptation / cattle / genetic diversity / histology / oxygen saturation / Ethiopia

Présentation (österreichischen Bibliothekenverbundes)

Version intégrale

Page publiée le 22 novembre 2015, mise à jour le 13 mars 2019