Books and Registers

All horses are evaluated on a case-by-case basis following these guidelines:

Book I

  • Sire is a licensed SWB or is approved to breed to SWB mares
  • Dam is SWB with Book I or Book II papers, or an approved warmblood or thoroughbred mare
  • Both sire and dam have at least 3 known generations

Book II

  • Sire is a licensed SWB or is approved to breed to SWB mares
  • Dam’s maternal grandsire or maternal great-grandsire is an SWB (or approved breed) that is not approved for breeding
  • Upgrade possibilities: With a fully approved sire, the offspring of this horse may be eligible to receive Book I papers.

Book III

  • Book III is given in rare circumstances. One of the parents is a SWB in Book IV or in Register A, B, or C who has excelled in sport. If this parent is the dam, she must also be in Studbook B.
  • The other parent is fully approved.
  • Upgrade possibilities: With a fully approved sire, the offspring of this horse may be eligible to receive Book I papers.

Book IV

  • Sire has been evaluated by the stallion committee, but was not approved at the time of breeding and is Book I SWB (or equivalent in an approved breed).
  • Dam is a Book I SWB (or equivalent in an approved breed).
  • Upgrade possibilities: With a fully approved sire, the offspring of this horse may be eligible to receive Book II papers.

Register A

  • Sire is a Book I SWB (or equivalent in an approved breed) but had not been evaluated by the stallion committee at the time of breeding
  • Dam is a Book I SWB (or equivalent in an approved breed).
  • Upgrade possibilities: With a fully approved sire, the offspring of this horse may be eligible to receive Book II papers.

Register B

  • Sire is a licensed SWB or is approved to breed to SWB mares
  • Dam’s pedigree is not acceptable due to unknowns or unacceptable breed
  • Upgrade possibilities: Offspring may be eligible to receive Book I or Book II, depending on its pedigree.

Register C

  • Sire’s pedigree is not acceptable due to unknowns or unacceptable breed
  • Dam’s pedigree may or may not be acceptable
  • Upgrade possibilities: With a fully approved sire, offspring may be eligible to receive Register B papers.