He joins two other Blues players out on loan at Moors - goalkeeper Connal Trueman and defender Dan Cleary.BCFC
The loan runs from today until 14 October 2017.
Twenty-year-old McDonald has been a regular for Blues Under-23s over the past few seasons, and finished the 2016/17 campaign as their top scorer, bagging 10 goals from just 24 starts.
He joins two other Blues players out on loan at Moors - goalkeeper Connal Trueman and defender Dan Cleary.
Moors, who are managed by Liam McDonald, are next in action this coming Saturday, when they travel to Bromley.
They have had a difficult start to their 2017/18 league campaign - collecting just seven points from their opening ten games, and are currently in 22nd spot in the table.