Battling to Satisfy India's Taste for Ice Cream
India's Gujarat Cooperative Milk Market Federation, which markets under--and is known by--brand name Amul, is battling Hindustan Lever for ice cream market in India; Amul appears to be gaining steadily over Hindustan Lever, which has been losing ground; Hindustan Lever's ice cream revenue fell 27 percent in quarter ended June; Hindustan Lever, which is 51 percent owned by Unilever, says it is less concerned with volume sales than with earnings, and that profits from ice cream are rising, totaling more than $1 million per quarter for first time in period ended June 30; map; photos (M)