Stud Book Rules

Rules and Services
Identification of Thoroughbreds



Rules and Services

Services for Mare Owners

This information outlines the processes involved in owning a broodmare that is recorded in the Australian Stud Book.

For detailed information view the: Rules of the Australian Stud Book »


Mare Returns

An annual Mare Return is to be lodged by the breeder each year advising:

  • The result of the colour, state, sex and date of birth of a foal
  • Whether the mare has no live foal and the reason for no foal (ie: slipped, missed etc)
  • Whether the breeder’s details have changed or advising of a new breeder.

When is it due?

Due to be returned to the Stud Book or submitted online within 30 days of the birth of a live foal or in the case of no live foal, 12 months from the last date of service.


Not Served Mare Returns

Breeders with a mare that has previously been to stud but has not been served during the current season must submit a ’Not Served Mare Return'. To obtain a ‘Not Served’ mare return, contact the ASB on 02-9663 8411.

When is it due?

Due to be returned to the Stud Book on 15 March of the season the mare was not covered.

Visit our Online Mare Return page to register your mare returns online and receive a 5% discount.



Identification of Thoroughbreds


In previous years, a passport (or Identification Papers) has been produced for Australian thoroughbreds. The production of these papers will cease for 2003 foals onwards and will be replaced by the Thoroughbred Identification Card at the time the horse is parentage verified. Click here to read more about the phase out of passports.

When is it issued?

Thoroughbred Identification Card is produced at the time a horse is parentage verified.


Parentage Testing

Every foal born from 2003 onwards and every broodmare in Australia is required to have a DNA test (referred to as Parentage Testing). Only authorised ASB veterinarians can carry out the extraction of hair required for this test. A DNA hair testing kit will be sent to the breeder by the ASB.

Please note that if a foal dies, its Parentage Testing Kit must be returned to the ASB as soon as possible.

When will my kit be sent?

The ASB will advise breeders of a two-month period in which their foal/s must be parentage tested. This is done at the same time as microchipping.

See our Foal Identification Checklist.


Imported Horses Parentage Testing

All imported horses are required to be DNA typed to enable acceptance into the ASB.

When is it due?

An import application form is due within 30 days of the horse’s arrival. The ASB will forward a DNA hair testing kit to the import applicant.


What's in the Parentage Testing Kit?

  • 1 x label (pre-printed with the horses' parents) to attach the hair sample to the DNA card
  • 1 x DNA card
  • 1 x MBS form
  • 1 x Batch Report form for the breeder
  • 1 x Batch Report form for the identifier
  • 1 x Microchip applicator with 8 barcode labels



All foals born in Australia from 2003 onwards are required to be microchipped.

What is the process?

The ASB will advise breeders of a two-month period in which their foal/s must be microchipped. This is done at the same time as parentage testing.

All imported horses born 2003 season onwards are required to be microchipped in Australia if not microchipped in their country of origin or previous country of residence.

An import application form is due within 30 days of the horse’s arrival. Microchipping is to be done at the same time as DNA sampling.

Only authorised ASB veterinarians can carry out the implanting of microchips. The ASB will forward the microchipping kit to the breeder. Breeders should then organise the authorised ASB vet to implant the microchip.

Microchipping is completed at the same time as parentage testing.

The veterinarian is required to complete a Microchip, Brand and Sample (MBS) form and return it to the Stud Book.

MBS form due within 5 days of microchipping the foal.

Mares and stallions born prior to 2003 and Shuttle Stallions are not required to be microchipped.


Freeze Branding

All thoroughbred horses in the Australian Stud Book are required to be freeze branded. Breeders who do not have unique brands (ie: other breeders have the same brand) must look in the Brands Register on this website to find out what numbers foals should be branded or call the ASB on 02-9663 8411.

When do I freeze brand my foal?

Foals must be freeze branded by 31 March of the first year of their life.


Brands Register

The Australian Stud Book is accumulating a database of all registered thoroughbred brands in Australia. Visit the Brands Register.

How do I register my brand?

Breeders should register their brands with the ASB as soon as possible to acquire a Brand Index Number.


Brand Index Number

Once registered with the ASB, a breeder’s brand is allocated a Brand Index Number. This number is required to be provided to the veterinarian carrying out parentage testing and microchipping.

What is my brand index number used for?

Veterinarians must quote the Brand Index Number on the Microchip, Brand and Sample form.


Foal Identification

Follow the steps below to see the requirements for new season foals. Dates and further information can be found in the Identification of Thoroughbreds section.




Step 1 If you do not have your brand registered with the Australian Stud Book, download a form from the Australian Stud Book website or contact the Stud Book. Once registered, you can obtain your Brand Index Number.
Step 2 Freeze Brand foal (by 31 March of 1st year of its life).
Step 3 Wait for the ASB to send your foals parentage testing kit. The kit will provide you with the dates that you are required to organise the vet to parentage test your foal (see kit contents).
Step 4 Arrange for the veterinarian to visit in the month designated by the Australian Stud Book to implant microchip. The vet will take a testing sample and complete the Microchip, Brand and Sample form and return it to the ASB. The vet will require your Brand Index Number at this time (see step 1 above).
Step 5 Approximately two weeks after the vet has taken the sample, check that the foal has been parentage verified on the Unnamed Produce page.




Stallion Return


Studmasters must submit a Stallion Return form each year for all stallions that serve mares. This form notifies the ASB of:

  • The approximate number of mares the stallion will cover during the season
  • The advertised service fee (including GST) for the season
  • The details of the stud and its location

These details are then displayed on the website under the stallions name.

When is it due?

Stallion Returns are sent to Stud Masters in May and are due to be returned to the Stud Book by 30 June each year.


Stallion Declaration of Service

A list of all mares served by a stallion, plus the first and last service date of these mares must be declared to the Stud Book. The Declaration of Service can be completed online through either the Stud Book website or through a direct data transfer from the stud’s computer system to the Stud Book. Studs interested in learning more about this method should contact the ASB on 02-9663 8473.

When is it due?

Automatic data transfer from stud to Stud Book is done daily. Other Service Declarations are due 15 January.


Horses Sold at Public Auction

Steps Owner Sales Copmany / Stud Book

Complete sale entry form (available from sale companies).

Send the horse’s Document of Description (if born before 2003) or Thoroughbred Identification Card to the sales company with the entry form.
 Sales company produces catalogue from entry forms received.
2 All horses born from 2003 onwards must be microchipped prior to sale. Contact the Stud Book if you have not yet received a parentage testing kit for microchipping.
3 Horse is sold at sale.

Passport is forwarded to purchaser by the sale company.

Horse born in 2003 or after will not have a passport.