Title page for ETD etd-07252012-132647


Document Type Master's Dissertation
Author Qwabe, Sithembile Olga
Email qwabes@arc.agric.za
URN etd-07252012-132647
Document Title Genetic and phenotypic characterisation of the South African Namaqua Afrikaner sheep breed
Degree MSc(Agric)
Department Animal and Wildlife Sciences
Supervisor
Advisor Name Title
Dr C Visser Co-Supervisor
Dr M A Snyman Co-Supervisor
Dr E van Marle-Koster Supervisor
Keywords
  • Namaqua Afrikaner sheep
  • farm animal genetic resources
Date 2012-04-24
Availability unrestricted
Abstract
Genetic and phenotypic characterisation is essential for the conservation and utilisation of farm animal genetic resources, especially indigenous types that are often disregarded due to lower production potential compared to commercial breeds. In this study a genetic characterisation was performed on 144 Namaqua Afrikaner sheep kept at the Karakul Experimental Station (KES) and Carnarvon Experimental Station (CES) and a private farm Welgeluk (WGK) using 22 ISAG recommended microsatellite markers. Results of this study showed that the mean number of alleles were low (3.6 for KES to 4.2 for WGK) for the loci tested. Heterozygosity values across loci ranged between 46% for WGK, 48% for KES and 55% for CES, indicating low to moderate genetic variation within the different populations. The AMOVA analyses revealed that 89.5% of the genetic variation in the breed was due to the differences within populations and 10.5% due to differences between populations. The genetic distance estimates revealed a close relationship between the CES and WGK populations. The population structure confirmed the differentiation of three clusters with relationships between the CES and WGK populations. Phenotypic characterisation of the breed was limited to the Carnarvon flock, where production and morphological data were recorded. Morphological measurements indicated an average body length of 71.2 cm and 68.7 cm for rams and ewes respectively. Over 60% of the sheep had their tail twisted to the left. The molecular data provided by this study will serve as a reference for genetic management and breeding strategies of the indigenous Namaqua Afrikaner sheep.

Copyright 2011, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.

Please cite as follows:

Qwabe, SO 2011, Genetic and phenotypic characterisation of the South African Namaqua Afrikaner sheep breed, MSc(Agric) dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-07252012-132647 / >

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