Resistance of Sabi and Dorper ewes to gastro-intestinal nematode infections in an African semi-arid environment

O Matika, S Nyoni, JB van Wyk, GJ Erasmus, RL Baker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Sabi and Dorper ewes were evaluated for resistance to gastro-intestinal nematode parasites (predominantly Haemonchus contortus) at the Matopos Research Station in Zimbabwe. Live weights (LWT), blood packed red cell volume (PCV) and faecal egg counts (FEC) were recorded at mating, I month before lambing and 1-3-month post-lambing for five separate lambings between 1996 and 2000. Dorper ewes were heavier (P <0;01) than Sabi ewes at all sampling times. Sabi ewes were more resistant to internal parasites than Dorper ewes as shown by their significantly lower FEC and significantly higher PCV at all sampling times except at 2-month post-lambing for FEC and at weaning (3-month post-lambing) for PCV At all sampling times except at weaning individual ewes were treated with an anthelmintic when their FEC was greater than 1500 eggs/g (epg) and/or their PCV was less than 20%. The proportion of Dorper ewes that was treated with anthelmintic was significantly higher than that of Sabi ewes at all sampling dates. This effect was particularly marked 1- and 2-month post-lambing. There was a post-parturient rise in FEC in the 2-month period after lambing for both breeds. (C) 2002 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Article numberPII S0921-4488(02)00251-1
Pages (from-to)95-102
Number of pages8
JournalSmall Ruminant Research
Volume47
Issue number2
Publication statusPublished - Feb 2003

Keywords

  • FECAL EGG COUNTS
  • GOATS
  • SUBHUMID TROPICS
  • PERI-PARTURIENT RISE
  • RUMINANTS
  • sheep
  • internal parasite resistance
  • SHEEP
  • Haemonchus contortus
  • Zimbabwe

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