BLOEMFONTEIN - A bull bellowed in sacrifice Saturday as South Africa's ruling ANC paid tribute to its ancestors and founding leaders, who 100 years ago paved the way for Nelson Mandela's rainbow nation. President Jacob Zuma led the slaughter of a black bull in a ceremony on the second day of the African National Congress centenary festivities to celebrate its rich anti-apartheid legacy now tarnished by scandals and challenges. "Today our leaders, traditional leaders and traditional healers, had to perform certain rituals before we get into serious business of celebration," said Zuma after the sacrifice.