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We are about to DNA test some cattle for parentage verification as they were ET calves and will be using the new SNP test for the first time. I am curious whether it would be worth doing the test for RFI (residual feed intake) at the same time. The donor animals we used are my best for gaining condition and weight on grass - does that mean they would likely show up as good scorers on the RFI test or are they better because they eat more or for some other reason? What I'm really asking is how applicable is the RFI test to proving or disproving the efficiency of cattle under a system like ours?
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