The Red Devons are a very old breed and have been bred from a time before modern parasite treatments so have very good natural resistance, which is probably why they will be popular with an organic group.
If it were me I would go for a first cross cow. An F1 will have on average about 16% improvement over the mean of economic traits in the two parent breeds. This is why Black Baldies ( Hereford Angus ) cows have been a mainstay for so long. The most efficient cow is a jersey angus or jersey hereford cross on kg's calf weaned per hectare. But just a plain hereford angus with a Speckled park bull over them might be the best option. The very best way is F1 cows ( jersey x hereford) mated to an F1 bull like a limosine x Charolas so four unrelated breeds are crossed and progeny are terminal
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