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Proposed draft guidance documents: Efficacy of inhibitor products

Have your say

New Zealand Food Safety would like your feedback on 2 proposed new guidance documents:

  • Efficacy and plant safety of urease and nitrification inhibitor products
  • Efficacy of methane inhibitor products

These documents explain the information needed to support efficacy claims in an application to register an inhibitor product under the Agricultural Compounds and Veterinary Medicines (ACVM) Act 1997.

Submissions close at 5pm on 28 October 2022.

Consultation documents

Draft guidance – Efficacy of urease and nitrification inhibitor products [PDF, 468 KB]

Draft guidance – Efficacy of methane inhibitor products [PDF, 385 KB]

Background information

A number of inhibitor substances were declared to be agricultural compounds under the Agricultural Compounds and Veterinary Medicines Act 1997 on 18 July 2022 by an Order in Council.

Agricultural Compounds and Veterinary Medicines (Inhibitor Substances) Order 2022 (SL 2022/191) – New Zealand Legislation  

This means those inhibitors products containing any of these substances now require authorisation under the ACVM Act. 

Find out more about inhibitors and the ACVM Act

There are currently no efficacy guidance documents for applicants on what information they need to supply as part of their application for registration of their inhibitor product.

Making your submission

Send us your feedback by 5pm on 28 October 2022.

Email your submission to

While we prefer email, you can send your submission by post to:

ACVM Consultation
New Zealand Food Safety
Ministry for Primary Industries
PO Box 2526
Wellington 6140
New Zealand.

What to include

We would like your feedback on the 2 proposed guidance documents, including on the following questions for each document:

  • Is the draft sufficiently clear?
  • Are there any aspects not covered in the draft that you believe should be in the draft?
  • Is there any unnecessary information included in the draft?

For the methane inhibitor product guidance document:

  • Under section 6.1.3(3) is "minimum mean reduction" supported? If not, what do you consider a more appropriate measurement?
  • Under section 6.1.3(4) on different feed types, is this supported? If not, what would you consider as an alternative?
  • Under section 6.1.3(5) on persistent activity, is 3 months appropriate? If not, what would you consider to be a more appropriate period and the rationale for this?
  • Section 6.1.5 covers dry matter intake requirements. Currently, this is an area where there is still uncertainty on what should be required. We would welcome your thoughts on what the content of this section should be.

Make sure you also include in your submission:

  • the title of the consultation document in the subject line of your email
  • your name and title (if applicable)
  • your organisation's name (if applicable)
  • your contact details (for example, phone number, address, and email)
  • the answers to the questions posed.

Submissions are public information

Note that all, part, or a summary of your submission may be published on this website. Most often this happens when we issue a document that reviews the submissions received.

People can also ask for copies of submissions under the Official Information Act 1982 (OIA). The OIA says we must make the content of submissions available unless we have good reason for withholding it. Those reasons are detailed in sections 6 and 9 of the OIA.

If you think there are grounds to withhold specific information from publication, make this clear in your submission or contact us. Reasons may include that it discloses commercially sensitive or personal information. However, any decision MPI makes to withhold details can be reviewed by the Ombudsman, who may direct us to release it.

Official Information Act 1982 – NZ Legislation