At present, there was only regulatory oversight for animals which were manipulated or experimented on while they were alive.
The Animal Welfare Amendment Bill which the committee was considering would allow Government to require institutions to report the killing of animals that were bred, but not used, for research.
Dr Williams said current rules also did not calculate how many animals were experimented on after being killed - such as having fresh tissue removed.
There was little data on this use of animals, but a survey found one large university killed then carried out testing on 3000 animals a year.
Around 300,000 animals were used in animal testing each year by universities, most of them rodents but also cattle, chickens and sheep.
Law changes
• New offence for wilful ill-treatment or reckless treatment of wild animals, with maximum sentence of 5 years' jail or $100,000 fine
• Killing of an animal for research must have approval of an ethics committee
•New powers for Government to ban painful surgical procedures, or to require a university to report how many animals it bred and did not use for testing.