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Birman cat

origin: France · 9 figures in the corpus · Q42563

Every figure below carries this breed's name or id in its source study -- grouped by what it measures, not ranked. A breed appearing under a study here does not mean every other breed was tested and came back negative; it means this is what has a named source so far. See each figure's own page for its caveats.

Longevity

14.39 years (life expectancy at age 0) verified

Birman: years (life expectancy at age 0) (Teng KT, O'Neill DG, Brodbelt DC, Church DB, Pegram C)

  • Study sample n=38.
  • Study breed label 'Birman' does not map 1:1 onto a single roster breed (see this file's _meta.notes).
16.1 years (median age at death) verified

Birman: years (median age at death) (O'Neill DG, Church DB, McGreevy PD, Thomson PC, Brodbelt DC)

  • Study sample n=12 (small sample; treat the estimate as imprecise).
  • Study breed label 'Birman' does not map 1:1 onto a single roster breed (see this file's _meta.notes).

Causes of death

373 deaths per 10,000 cat-years at risk (ASMR) verified

Birman: age-standardized total mortality rate, Swedish insured cats (Egenvall 2009, Agria)

  • A rate, not a life expectancy -- higher ASMR means higher yearly death risk, not necessarily a shorter median lifespan.
  • Breed label 'Birman' does not map 1:1 onto a single roster breed.
2.4 percent stillborn verified

Birman: stillbirth rate, UK pedigree litters (Sparkes et al. 2006)

  • Study sample n=88 litters.
  • Study breed label 'Birman' does not map 1:1 onto a single roster breed.
3.5 percentage points dead between birth and 8 weeks verified

Birman: birth-to-8-week kitten mortality, UK pedigree litters (Sparkes et al. 2006)

  • Study sample n=88 litters.
  • Study breed label 'Birman' does not map 1:1 onto a single roster breed.

Breeding

3.59 mean kittens per litter verified

Sacred Birman: mean litter size (Cerna et al. 2024)

  • Study sample n=44 litters.
  • Study breed label 'Sacred Birman' pools variants or does not map 1:1 onto a single roster breed (e.g. joint shorthair/longhair or joint-breed labels in the source table).
9.1 percent of litters by caesarean section verified

Sacred Birman: caesarean-section rate (Cerna et al. 2024)

  • Study sample n=44 litters.
  • Study breed label 'Sacred Birman' pools variants or does not map 1:1 onto a single roster breed (e.g. joint shorthair/longhair or joint-breed labels in the source table).
19.0 percent cumulative kitten mortality to 12 weeks verified

Sacred Birman: cumulative kitten mortality to 12 weeks, stillbirths included (Cerna et al. 2024)

  • Study sample n=44 litters.
  • Study breed label 'Sacred Birman' pools variants or does not map 1:1 onto a single roster breed (e.g. joint shorthair/longhair or joint-breed labels in the source table).

Category (FIFe)

1 FIFe category (1-4, coat/morphology grouping) verified

Sacred Birman (SBI): FIFe Category 1

  • Category is a coat/morphology grouping FIFe itself uses, not a ranking (1=lowest number, 4=highest, no ordinal meaning).
  • FIFe breed label 'Sacred Birman' (SBI) does not have a confident 1:1 match in data/breeds.json.