The Cartujano line in Spanish law: what the official texts actually say
Spain's livestock decrees and the Purebred Spanish Horse breeding programme mention the Carthusian strain by name. We read each passage and list what they settle and what they leave open.
“Cartujano” is one of the most valuable words in a Spanish horse advert, and one of the least defined. This article does not retell the legend. It looks at the places where the word appears in Spanish law and in the official breeding programme for the Purebred Spanish Horse (PRE), quotes what those texts commit to, and marks the questions they do not answer.
Where the Carthusian strain appears in official texts
We searched the full text of the official documents named below for the word and its Spanish forms (cartujano, cartujana). The results:
| Document (date) | Passage | What it establishes |
|---|---|---|
| Real Decreto 2129/2008, Annex I (text as issued) | Native horse breeds “de fomento”: “Española” | The catalogue as issued in 2008 names the breed only; the strain is not mentioned anywhere in the decree. Annex I was later replaced by ministerial orders (next row). |
| Orden APM/26/2018 (BOE of 22 January 2018), Annex I | “Española (con estirpe Cartujana)” | The strain first appears in the national catalogue here, inside the PRE entry. The 2012 and 2016 versions of Annex I (Orden AAA/251/2012, Orden AAA/1357/2016) read “Española” only. |
| Real Decreto 45/2019, Annex I, 1.e | “Pura Raza Española (incluida la estirpe Cartujana)” | The national catalogue lists the Carthusian strain by name, inside the PRE entry, not as a breed of its own. Real Decreto 527/2023 replaced this annex in June 2023 and its section 1.A.e keeps the same wording. |
| PRE breeding programme 2020, section I | The Carthusian bloodline “is recognized specifically” in the Official Catalog and included “within the scope of the PRE” | The managing association reads the catalogue entry the same way: one breed, one named strain inside it. |
| PRE breeding programme 2020, section III.1 | The main objective includes guaranteeing “the preservation of the Breed and the Carthusian bloodline” | Conserving the strain is a stated goal of the programme, alongside improving the breed. |
| PRE breeding programme 2020, section III.4 | Software to estimate inbreeding, for the breed “and more specifically the Carthusian bloodline” | Inbreeding inside the strain is treated as a specific concern. |
| Real Decreto 45/2019, Annex III, B | The Yeguada de la Cartuja–Hierro del Bocado in Jerez de la Frontera is designated the national zootechnical reference centre for horses | A state-owned stud carrying the Carthusian name has a formal role; the programme also names it as gene bank and reproduction centre. |
Two of these points are easy to miss. The explicit strain wording entered the national catalogue in January 2018 (Orden APM/26/2018) and was carried into the 2019 catalogue; it is not in the 2008 text or in the 2012 and 2016 versions of the annex, so a text written before 2018 could truthfully say the national list did not name it. And in every passage the strain sits inside the PRE: none of the documents treats “Cartujano” as a separate breed.
What “estirpe” means in Spanish law
Both decrees define the term. Real Decreto 45/2019 (Article 3.b) describes an encaste, estirpe o variedad as a closed subpopulation of a breed, genetically stable and uniform, created by reproductive isolation using animals of that breed only, without other genetic material, for at least five generations. The 2008 decree (Article 2.c) used almost the same wording, defining a “closed population” without the words “genetically stable and uniform”.
That is a pedigree definition. It says how the group was bred (closed, at least five generations), not that the group is genetically distinct from the rest of the breed.
What the texts do not settle
- How a horse is certified as Carthusian. The 2020 programme divides the stud book into three registers (Birth, Permanent, Non-Reproductive) with groups A and B inside two of them. None of those is a Carthusian register, and the programme does not describe a procedure for confirming that a given horse belongs to the strain. The 2022 stud-book management regulation we also read does not mention the strain at all. We could not find the certification rule in the documents we opened, so ask the seller which document their claim rests on.
- How many Carthusian horses there are. The programme gives a census for the whole PRE (252,852 head at the end of 2019) but no separate figure for the strain.
- Whether the strain is genetically different. The decrees do not address it.
The history and the genetics, briefly (secondary source)
The background below is summarised from the English Wikipedia article on the Carthusian Spanish horse (CC BY-SA 4.0), which we use only as a secondary source here. That article traces the line to breeding by Carthusian monks recorded from 1476, to a stud near Jerez, and to a dark grey stallion named Esclavo, a descendant of a horse acquired by the Zamora brothers early in the eighteenth century, as founding sire. It also reports two studies that did not find the strain to be genetically distinct: a 2005 pedigree analysis by Valera and colleagues in Livestock Production Science and a 2006 genetic study. We have not opened either paper, so treat those findings as reported, not verified by us.
Our reading of the two kinds of evidence together: the legal definition and the genetic findings do not contradict each other. A strain can meet a closed-pedigree definition while sharing almost all of its genes with the breed it was drawn from. “Carthusian” is a statement about ancestry; it is not, on these sources, evidence of a different kind of horse.
A short checklist for a Cartujano claim
- Ask which register and document confirm it. A PRE passport shows registration in the PRE stud book; the strain claim needs its own basis.
- Check whether the text you are reading predates the 2019 catalogue. If it cites “the official list”, find out which one.
- Separate pedigree from performance. Nothing in the documents above links the strain to a higher score, a genetic category or a breeding grade.
- Treat price premiums as market behaviour, not as an official valuation; none of the texts sets one.
Sources
- BOE: Real Decreto 45/2019, Article 3.b, Annex I (1.e) and Annex III (B). Opened 2026-10-31.
- BOE: Real Decreto 2129/2008, Article 2.c and Annex I. Opened 2026-10-31.
- BOE: Real Decreto 527/2023, Annex I section 1.A.e (current catalogue; same Carthusian wording). Opened 2026-10-31.
- BOE: Orden APM/26/2018 (Annex I, horse entries), Orden AAA/1357/2016 and Orden AAA/251/2012 (Annex I, horse entries; checked for the strain name). Opened 2026-10-31.
- ANCCE: Purebred Spanish Horse Breeding Program (English edition of the programme approved on 15 June 2020 and published in BOE no. 175 of 24 June 2020), sections I, II.2, III.1 and III.4. Opened 2026-10-31.
- ANCCE: Reglamento de Gestión del Libro Genealógico del PRE (stud-book management regulation), updated June 2022 (searched for the strain; no mention found). Opened 2026-10-31.
- Wikipedia: Carthusian Spanish horse, text available under CC BY-SA 4.0; history paragraph paraphrased and shortened. Opened 2026-10-31.
Who this is for
A reader who meets the word Cartujano in a sales advert or pedigree and wants to know what Spanish law and the official PRE breeding programme say about the Carthusian strain.