Scottish Fold
The Scottish Fold is a distinctive breed of domestic cat characterised by a natural dominant gene mutation associated with osteochondrodysplasia. This genetic anomaly affects cartilage throughout the body, causing the ears to "fold", bending forward and down towards the front of the head. While this trait contributes to the breed's unique appearance, often described as "owl-like", it also causes health problems.
The breed's name, originally Lop-ears or Lops after the lop-eared rabbit, became Scottish Fold in 1966. Depending on registries, longhaired Scottish Folds are varyingly known as Highland Fold, Scottish Fold Longhair, Longhair Fold, and Coupari.
Research has revealed that all Scottish Fold cats are affected by osteochondrodysplasia, a developmental abnormality that affects cartilage and bone development throughout the body. This condition causes the ear fold as well as malformed bone structures, and the breed can develop severe painful degenerative joint diseases at an early age. Because of these health conditions, breeding Fold cats is prohibited in several countries, and some major cat registries do not recognise the breed.
History
Origin
The original Scottish Fold was a white barn cat named Susie, who was found at a farm near Coupar Angus in Tayside, Scotland, in 1961. Susie's ears had an unusual fold in their middle, making her resemble an owl. When Susie had kittens, two of them were born with folded ears, and one was acquired by William Ross and his wife, Molly, neighbouring farmers who were cat fanciers. The breeding programme produced 76 kittens in the first three years – 42 with folded ears and 34 with straight ears. The conclusion from this was that the ear mutation is due to a simple dominant gene. Ross registered the breed with the Governing Council of the Cat Fancy in the United Kingdom in 1966 and started to breed Scottish Fold kittens with the help of geneticist Pat Turner. However by the early 1970s the GCCF stopped registering the cat due to concerns about potential health issues such as ear infections and deafness.In 1970 the first Scottish Fold kittens were introduced to America via a Neil Todd of Massachusetts who was researching the mutation. Further cats were brought over and the Scottish Fold breeding program continued with American Shorthairs and British Shorthairs being introduced.
Breed recognition
In 1978 the Cat Fanciers' Association granted the breed championship status.In the mid 1980s the long-haired version started to gain recognition.
The International Cat Association was the first registry to recognized the longhairs for championship competition in the 1987–88 show season and CFA followed in 1993–94.
Characteristics
Ears
Scottish Fold kittens that do not develop folded ears are known as Scottish Straights.Body
The Scottish Fold is a medium to large sized cat, which can come in any colour, even calico. Males typically weigh, and females weigh. The Fold's entire body structure, especially the head and face, is generally rounded, and the eyes large and round. The nose is short with a gentle curve, and the cat's body is well-rounded with a padded look and medium-to-short legs. The head is domed at the top, and the neck very short. The broadly-spaced eyes give the Scottish Fold a "sweet expression".Coat
Scottish Folds can be either long- or short-haired, and they may have nearly any coat colour or combination of colours. Shorthair Scottish Folds have thick and soft fur, with longhair Folds having longer fur and tufts located around the extremities.Genetics
An early study suggested that the fold is inherited as an autosomal dominant trait. A later study suggested an incomplete dominance. A cat with folded ears may have either one or two copies of the dominant fold gene. A cat with normal ears should have two copies of the normal gene.Mating a homozygous fold with any cat will produce all folds, but because homozygous folds are prone to severe health issues, breeding for them is generally considered unethical. A homozygous to normal mating will produce only heterozygous folds but presumably in ethical breeding programs, there will be no homozygous cats available to breed from.
The only generally accepted breeding gives a 50% chance of producing heterozygous folds and 50% chance of producing progeny with normal genes.
There is suspicion that some non-fold litters are genetically heterozygous folds but because of very low expression of the gene, appear to be straight-eared. Such kittens may develop folded ears initially which then straighten back out. Because of this there are suggestions by some breeders to avoid mating Folds with straight-eared Scottish Folds but only use British Shorthairs as outcross. If Scottish Shorthairs are to be used, they should be test mated to a BSH to make sure that they are not genetically folds. If such apparent straight-eared cats are mated with a fold, there is a 75% chance of folds and 25% chance of straight ears.
In 2016, the genetic mutation responsible for the folded ears and the osteochondrodysplasia was identified. It was found in a gene encoding a calcium permeable ion channel, transient receptor potential cation channel, subfamily V, member 4. The mutation is a V342F substitution in the fifth ankyrin repeat within the N-terminal cytoplasmic domain. It was also found in a human patient with metatropic dysplasia.
Acceptance
Legal bans on the breeding and sometimes sale of Folds have been enacted in several countries, including Australia, Austria, Belgium, the Netherlands, Norway, and Scotland, due to the breed's health issues, especially deformities and pain caused by osteochondrodysplasia, which results in abnormalities in bone and cartilage throughout the body. Some of the major cat registries, such as the GCCF and FIFe, do not recognise, nor allow for the registry and competition showing of, Scottish folds.Legal bans
Due to the prevalence of osteochondrodysplasia in the breed, several countries and states have prohibited breeding with Scottish folds, in order to protect animal welfare. Banning countries include the Netherlands in 2014, Austria in 2020, Flanders in 2021, Victoria. The breed is also indirectly banned by Norwegian and Swedish legislation prohibiting the breeding of animals with genetic make up that makes it likely to produce unhealthy offspring. Some countries have also banned selling of Scottish fold cats, or the breeding with any cat that bears the gene mutation resulting in osteochondrodysplasia, so even breeding with some of the Scottish straights may be legally restricted. Potential parent cats can be tested for this mutation before breeding.Registry bans
Because of its health problems, the breed is not accepted by either the Governing Council of the Cat Fancy or the Fédération Internationale Féline. GCCF withdrew registrations in 1971 due to crippling deformity of the limbs and tail in some cats and concerns about genetic difficulties and ear problems such as infection, mites, and deafness, but the Folds were exported to the Americas and the breed continued to be established, using outcrossing with British Shorthairs and American Shorthairs. Since the initial concerns were brought, the Fold breed has not had the mite and infection problems.Cat Fanciers' Association breeders have stated that using only fold to non-fold breeding has eliminated problems with stiff tails, shortened tails, and bone lesions. In the FIFe discussion, the representative for British breeders claimed that they were not seeing the problem in their cats, and that the study which showed that all heterozygous also have the condition had a small sample size. An offer of free X-ray radiography was presented to 300 breeders to find a Fold cat with healthy hind legs, but it was never taken up. A similar offer was set up by the World Cat Federation together with researcher Leslie Lyons but there was also no response. FIFe stated that they will not consider recognizing Scottish Folds if breeders will not allow their breed to be scrutinized.
In a report on Scottish Folds, the Breed Standards Advisory Council for New Zealand Cat Fancy states that "Breeders may not have appreciated the strength of the evidence that heterozygous cats can and do develop OCD." While research shows that all heterozygous Folds develop OCD, and anecdotal evidence shows that heterozygous Folds can and do develop OCD, they do not show whether mildly affected parents are more likely to have mildly affected offspring. They also do not show what percentage of Folds are severely affected. The report states that there is not enough information to justify banning Scottish Fold matings, but enough to justify a level of concern. Recommended guidelines include:
- A requirement for periodic vet examination of breeding cats for any evidence of lameness, stiffness, or pain—breeding cats with signs to be desexed.
- A requirement for periodic X-rays of breeding cats and comparison of X-ray evidence with clinical symptoms, possibly leading to a requirement that cats with a specified degree of skeletal change to be desexed.
- Requesting the agreement of pet owners to be periodically contacted by the NZCF or by a researcher, to provide reports about the health of their cat.
- All information to be reported/submitted to the BSAC to allow information to be collated to give an overall picture of FOCD in Scottish Folds in NZ.
- Requirements to be in place for a minimum of 5 years to enable tracking of the health of Folds over time.
Popularity