Sat Apr 15, 1:12 PM ET MOSCOW (Reuters) - Hundreds of Russians gathered for the first day of the annual "pig Olympics" on Saturday, cheering a field of 12 piglets who competed in three events: pig-racing, pig-swimming and "pigball". Each pig was carried into the arena, squealing angrily and dressed in its own numbered bib, while Muscovites laid bets on challengers such as Mykola from Ukraine, Nelson -- representing South Africa -- and the home favourite, Kostik Russisch Schwein. In pigball, contestants chase a sweet-tasting soccer ball around an enclosed arena with their snouts, scoring when the ball goes into a goal. The pig-admirers included ultra-nationalist politician Vladimir Zhirinovsky, who put 100 roubles (2.05 pounds) on Borka to win the running race, in honour of one of his political rivals. "I've always loved pigs, all my life. I had four or five when I was a kid," he told Reuters. Alexei Sharshkov, vice-president of the Sport-...