It took me some digging, because all the articles you pull up when researching, CONVENIENTLY, EXCLUDE the following paragraphs:
http://www.ngaherelodge.com/wp-content/uploads/2018/07/Lowline-Angus-Briefing-Paper.pdf
"The protein conversion performance of the High Line and Low Line animals was monitored
on an individual basis, and then recorded. The Trangie Research Centre concluded that the
High Line animals were about five percent more efficient converters of grass to meat than
the Low Line. Nevertheless, the computer printouts which showed the best performers
were High Lines and the least effective performers were Low Lines, also showed that for the
great bulk of High Lines and Low Lines their efficiency as protein converters were much the
same. "
"The NSW Agricultural Department was proposing to terminate the experiment, sending the cattle
from the trial to abattoirs for slaughter but after some hesitation, and after strong representation,
complete dispersal sales were held at Glen Innes and at Trangie and the cattle were sold into private
ownership. "
I am not saying they are not useful in a nitch market. I am just stating what the REAL story behind them is. The only reason I knew this, was I have a good friend that has family in NZ & Australia. He told me the real story.
Simply put, they were destined to be destroyed, but somebody wanted them, so they put them up for auction.