Madison Square Garden Co.’s fiscal third-quarter earnings fell 22% as the National Basketball Association’s work stoppage hurt the media-and-sports company’s revenue. The NBA work stoppage delayed the start of the professional basketball league’s regular season by about two months, cutting the combined number of preseason and regular season games to six from 40 a year earlier. The former component of Cablevision Systems Corp. has continued to post a profit since it went public early last year. Cablevision spun off MSG to separate its cash-rich cable businesses from its more financially volatile entertainment properties. For the quarter ended Dec. 31, MSG reported a profit of $25.6 million, or 33 cents a share, down from $32.7 million, or 42 cents, a year earlier. Revenue dropped 14% to $373 million. Operating margin edged up to 12.9% from 12.1%. Revenue at MSG Media, which includes MSG Networks, fell 1.2% though the segment’s operating profit rose 14%. MSG’s entertainment business more than doubled its operating profit despite a 15% decline in revenue. The sports segment saw revenue drop 31% and its operating loss widened, according to WSJ.com.