Genetic find might lead to TB-resistant cattle

Scientists have identified genetic traits in cattle that might allow farmers to breed livestock with increased resistance to bovine TB.

Scientists have identified genetic traits in cattle that might allow farmers to breed livestock with increased resistance to bovine tuberculosis (TB).

The study, which compared the genetic code of TB-infected animals with that of disease-free cattle, could help to eliminate a disease that leads to major economic losses worldwide.

The research, led by the University of Edinburgh's Roslin Institute, has identified a number of genetic signatures associated with TB resistance in the cows that remained unaffected.

The study builds on previous research by the Roslin Institute that showed that some cattle might be more resistant to bovine TB as a result of their genetic make-up.

Researchers at the Roslin Institute said the latest finding is significant as it sheds further light on whether it might be possible to improve TB control through selective breeding.

The team used the latest gene identification techniques to compare the genes of healthy and infected female Holstein-Friesians.

Bovine TB, caused by Mycobacterium bovis, not only infects cattle, but other livestock and wildlife. It also remains a risk to humans.

Despite intensive efforts over many decades, bovine TB continues to have a serious effect on livestock, affecting farm profitability and animal welfare.

This latest research, funded by the U.K.'s Biotechnology & Biological Sciences Research Council (BBSRC) and the European Union, was published in the journal Heredity.

Researchers at The Roslin Institute worked on the study with colleagues from the Agri-Food & Biosciences Institute (AFBI) and Queen's University Belfast.

Refining genomic predictors of resistance will be the focus of a new BBSRC-funded study to be carried out by researchers at Roslin, the AFBI and Scotland's Rural College, the SRUC.

Lead researcher Professor Glass said of the results: "Differences between cattle in their genes is not the only factor in determining whether the animal will get bovine TB or not; various environmental factors as well as differences in the TB bacteria may also affect susceptibility.

"If we can choose animals with better genotypes for TB resistance, then we can apply this information in new breeding programs alongside other control strategies. It is hoped that can help us to more effectively control TB in cattle."

The study is available online at http://www.nature.com/hdy/journal/vaop/ncurrent/full/hdy2013137a.html

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