 Henry Fell, in "Intensive Sheep Management" posits that the Romney is, “A breed which ha[s] all the virtues save one, that of prolificacy… will thrive happily at extraordinary densities and seems to enjoy it.” A number of large Romney flocks in New Zealand have in the last several decades achieved better than 1.7 lambs for every ewe exposed to the ram, showing much better prolificacy than Fell had observed in England.Some leaders are going yet higher, still with good survivability.Almost every detailed description of the Romney cites relative resistance to foot rot, an attribute rarely mentioned in descriptions of other breeds.