He commented on how all the cows were "outstanding" and it was difficult to pick category winners, Sinclair said.
Compared with last year, five more farms and 51 more cows were entered in the southern region this year.
"I think it's because all the A&P shows have been cancelled and people are still wanting to compete."
In past competitions, the southern finalists were from a couple of farms. This year the finalists were from nine farms.
"That's pretty exciting that everyone is doing well."
The competition, run by the New Zealand Holstein Friesian Association, had six in-milk age categories.
The top two cows in each class in each region progress to the national competition to compete for the champion and reserve champion titles.
For the national competition, another judge began scrutinising the southern finalists this week, visiting the first farm in Invercargill on Monday.
The national prize winner would be announced at the Holstein Friesian New Zealand annual conference in June.