NEWMARKET, UK--For an auction largely trading in very modest material, the March Sale could hardly have found a more resonant register at Tattersalls on Wednesday. For one thing, the fact that it was staged at all was a tribute to the improvisation and resilience demanded of the bloodstock industry, no less than any other walk of life, over the past year. And two of its three principal dividends, albeit infinitesimal on the scale of the investment they represented, caused those involved to reflect afresh on the recent loss of two...