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Monday, May 23 • 17:00 - 18:00
Genotypic and phenotypic resistance and resilience of sheep to gastro-intestinal parasitism

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Selection for genetic resistance and resilience to gastro-intestinal worms is established practice in the Australian sheep industry. Genetic resistance is mediated by host immune response which has been shown to be a significant contributor to reduced growth rate in scourworm infections in sheep. Several questions of practical importance arise:  Can  selection for resistance inadvertently reduce productivity of meat sheep ?: Are there differences in the cost of the immune response between lambs that differ in their potential to limit worm infection (resistance)?: If so, is the cost influenced by co-selection for increased growth rate in the presence of infection (resilience)?  There are two mechanisms to address these questions, namely review of industry genetic and productivity data, and structured experimentation in known genetic lines of sheep. This presentation draws the available information together, defines undisputable knowledge, attempts to identify questionable assumptions, and assembles thoughts on what we need to know to underpin ongoing efficient selection for resistance and resilience to worm infections in sheep.


Dr Ian Carmichael

Dr Ian Carmichael graduated in Veterinary Science from Melbourne University in 1967 and was awarded a DVSc from the University of Pretoria, South Africa in 1990. He worked in Africa and Asia for two decades as a specialist research scientist in government and corporate educational... Read More →

Monday May 23, 2016 17:00 - 18:00 ACST
Room L2 Adelaide Convention Centre

Attendees (4)