Why is ferromolybdenum preferred over molybdic oxide for some alloy steels?

For higher-grade alloy steels containing more than 1 percent molybdenum, ferromolybdenum is preferred over technical molybdic oxide. While technical molybdic oxide is the most cost-effective agent for adding molybdenum to steel and iron, using ferromolybdenum is advantageous because it avoids the necessity of adding oxygen to the heat during the production process.1