The presidents at Brigham Young University and Ricks College, the LDS Church's private schools, will serve until replaced, officials said Monday.

Both BYU President Jeffrey R. Holland and Ricks President Joe J. Christensen were called to full-time positions as members of the First Quorum of the Seventy of The Church of Jesus Christ of Latter-day Saints during the Saturday afternoon session of conference."Both of them will serve until they are released," said Don LeFevre, church spokesman. "As far as their replacements go, that's up to the leadership of the church and the Church Educational System. Anything beyond that would be just speculation."

Paul Richards, BYU public communication director, said he will have a better idea concerning the replacement process after the university's Board of Trustees meets Tuesday. "They haven't had a chance to meet yet and make a determination," Richards said. "We will know more after Tuesday."

Early Monday, Elder Christensen hadn't yet discussed his new assignment with his staff at Ricks, the two-year school in Rexburg, Idaho.

The replacement process hasn't been discussed yet, said Brent Kinghorn, community services vice president. "We have not seen President Christensen, so we really do not have a confirmation. I know some general authorities have been presidents of missions and presidents of temples. Maybe this one will be president of a college."

Elder Holland was appointed president of BYU in the fall of 1980. Among his accomplishments was a massive, $100 million fund-raising campaign, "Excellence in the '80s" program and the completion of the BYU Jerusalem Center, despite loud opposition from orthodox Jews.

Elder Christensen took over at Ricks in 1986 and guided the school through its 1988-89 centennial celebration. Ricks is the largest private junior college in the United States.