"We're up against a $300 million company, and we don't believe they should have the competitive advantage of treating their workers the way they do. It undercuts everybody, it creates a race to the bottom."
Fenton said the new bill wasn't radical legislation, just re-setting to previous conditions and removing an uneven playing field.
She rejected claims the bill will lead to further strikes, saying the meat industry hadn't had a strike since 1999, and "the only radical industrial action we've seen in the meat industry in the last 10 years has been the unlawful lockouts by Affco Talleys, and there's been several of them."
"In the rest of the meat industry we have good relationships. We have collective agreements right across the industry, we have thousands of members, we have regular negotiations and we haven't had a strike in years," Fenton said.
"The union has had to spend a lot of members' resources - and these are not wealthy members, these are people working seasonal jobs out in small towns who are lucky sometimes if they get to work six months in the year. We've had to use their funds to mount a legal defence against one company. You might like to ask a question about why that is."
Last week, Affco made a submission to the select committee, in which it opposed the bill, saying it "takes away employer flexibility, seeks to force common provisions and terms and conditions on all parties, excessively complicates the process for determining a new employees' terms and conditions, undermines health and safety obligations and otherwise hinders efficiency, productivity and the employees' own working success."
National Party MP Scott Simpson said Affco had told the committee the industry had seen a "rapid rate of automation" over the past 10 or 20 years, and if the bill is passed, they may automate further to continue to deliver returns to shareholders.
However, the union's national secretary Graham Cooke denied there had been rapid automation so far and said automation wasn't that simple in the meat industry, though accepted it will eventually happen.
Cooke said Affco was the only company in the industry to restrict union access, and union density in all Affco plants had dropped to 10 per cent by last year from 95 per cent in 2010.
The select committee's report on the bill is due by August 1, after which it will have its second reading.