This would be done by such actions as videoing lectures ahead of time, providing other resources and making schedule changes.
Despite the concerns, support for the strike was strong.
The branch had nearly 1200 members across five locations, who voted "overwhelmingly" in favour of taking strike action in a ballot held last week.
University of Otago vice-chancellor Prof David Murdoch said in an email sent to university staff on Tuesday that pay would not be deducted for striking staff.
This was a gesture of good faith and the university was hopeful of finding a solution through bargaining.
The university worked to make "fair and reasonable" offers that rewarded staff as much as possible while upholding its duty of fiscal responsibility, he said.