Green Party MP Sue Kedgley is upset Parliament's Speaker will not allow a conscience vote on her Animal Welfare Amendment Bill.
Ms Kedgley says Lockwood Smith has agreed to allow a conscience vote on Maori Party MP Te Ururoa Flavell's Gambling Bill.
She says she agrees with that, but the issue of animal welfare is also a matter of conscience.
Ms Kedgley says Dr Smith has refused a conscience vote on her bill on the grounds it is an economic matter.
But she says animal welfare is an ethical and moral issue.