Sheep study looks for genetic clues
12 Dec, 2005
Source: Lincoln University
Scientists are looking for clues to pest resistance and immune response in sheep by studying the genetics of merinos first taken to Pitt Island over 150 years ago.
As a wild population, the Pitt Island sheep have not been exposed to the same selective pressures as farmed flocks on the mainland.
“We think that natural selection through living in a harsh environment for decades may have resulted in them developing resistance to certain parasites. We already know they have a different parasite fauna from flocks on the mainland,” Dr Jo Abbott from Lincoln University explains.
One gene the researchers are particularly interested in has 17 different alleles. The research team using molecular biology techniques to compare allele frequencies in the Pitt Island population with those in New Zealand mainland merino flocks, as well as merinos in Germany, Australia and the West Indies. They are trying to find out whether selective farming practices have led to a shift in allele frequencies.
“Understanding the genetic basis for differences in resistance and immunity may result in farmers being able to breed sheep with stronger immune systems. It would be really exciting if this research meant that farmers were able to breed sheep that were more resistant to parasites.”
One of the long term benefits might be that farmers use fewer drenches and treatments on their flocks.
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- 14 November 2007
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