Birman cat nutrition: calories, kidney checks and hairballs

Healthy Birmans tend to have higher blood creatinine than other cats, which matters more for this breed's long-term care than any single ingredient. In a 2018 study of clinically healthy Birmans, both creatinine and SDMA, the two blood markers used to judge kidney function, ran higher than in cats of other breeds, and some healthy Birmans sat above the standard reference range. Beyond that, a Birman is a medium-to-large, stocky longhair that takes about three years to mature, according to the Cat Fanciers' Association. Its coat is easier to keep than most longhairs', and the breed has a documented higher risk of feline infectious peritonitis.

Calories and body weight

A Birman's stocky build can hide extra weight, so the scale and the hands are more reliable than the eye. The Merck Veterinary Manual estimates a cat's resting energy requirement (RER) as 70 × body weight in kg to the power 0.75, then multiplies it by 1.2 for a neutered adult, 1.4 for an intact adult and 1.0 for a cat prone to obesity. Kittens get 2.5 × RER, or can be fed free choice.

The numbers are a starting point. An indoor, neutered adult that spends much of the day resting usually belongs at the lower end. Weigh the cat once a month on a kitchen or baby scale. At a healthy weight the ribs can be felt under a thin layer of fat without pressing, and there is a visible waist from above. Puzzle feeders and several small portions spread across the day give an indoor cat something to do at mealtimes and slow down fast eaters.

Heart health and taurine

Cardiomyopathies are common in cats. The ACVIM consensus statement on feline cardiomyopathies notes that many affected cats tolerate the disease well and live a normal lifespan, while others develop heart failure, blood clots or sudden death. Hypertrophic cardiomyopathy (HCM), where the heart muscle thickens, is the form Birman breeders screen for; the Cat Fanciers' Association credits that testing with helping keep the breed's gene pool healthy. How much more often Birmans develop HCM than other cats is not well established.

No food has been shown to prevent HCM. Taurine often gets mentioned here, but its link is to a different disease. Cats need taurine in their diet, and a deficiency causes dilated cardiomyopathy, where the heart muscle becomes thin and weak. Clinical cases have become far less common since that link with taurine-deficient diets was recognized. A complete and balanced cat food supplies enough taurine, so deficiency is now mainly a concern for cats on diets that are not, such as some home-made recipes.

Coat and grooming

The Birman coat is silky and of medium length. According to the CFA it has no undercoat to tangle or mat, the breed sheds less than most longhaired cats, and weekly combing is usually enough. Diet does its part quietly. A complete food provides the protein, fatty acids and zinc that skin and hair depend on, and switching brands rarely changes a healthy coat. When a Birman's coat turns greasy, dull or unkempt, the cause can be weight gain, arthritis, dental pain or another illness that makes grooming harder, and that calls for a vet check rather than a new food.

Hairballs

A semi-longhaired cat that grooms itself carefully will swallow hair. According to the Cornell Feline Health Center, it is not unusual for a cat to bring up a hairball every week or two without lasting harm, and a hairball that passes into the intestine instead can cause a blockage. Cornell also advises a prompt vet visit for any cat vomiting more than once a week, or vomiting alongside lethargy, poor appetite, blood, increased thirst, changes in urination or diarrhea.

Regular combing removes loose hair before it is swallowed and is the simplest measure. Hairball-control foods generally rely on added fiber to move hair through the gut. They are not a substitute for a vet visit when a cat brings up hairballs more than once a week, because that frequency falls under the same threshold as any other vomiting.

Kidney checks in older Birmans

Chronic kidney disease is diagnosed and staged largely from blood creatinine and SDMA. A healthy Birman with naturally higher values can look as if its kidneys are failing when judged against ranges built from other cats. The 2018 study concluded that SDMA may be the better marker in Birmans and that reading both values together helps avoid misdiagnosis or mis-staging. In practice, a baseline blood panel while the cat is young and healthy gives the vet a personal reference point for later years. If results come back borderline, mention the breed and ask whether a breed-specific range applies.

Water intake matters for kidney and bladder health in any cat. Wet food, or water added to dry food, raises the total a cat takes in, and a water fountain or several bowls around the house can help cats that drink little.

Feline infectious peritonitis

FIP is a severe inflammatory disease caused by feline coronavirus, a common infection that stays mild in most cats. Purebred cats are affected more often than mixed breeds. In 16 years of records from a veterinary teaching hospital, Birmans were one of six breeds with a significantly higher risk, and young cats, males and intact cats were also diagnosed more often.

No food, supplement or immune booster has been shown to prevent FIP. What owners can control is prompt attention. A young Birman with a fever that does not settle, weight loss, a swelling belly, labored breathing or changes in its eyes or behavior should see a vet without delay, and any new kitten should have its first health check soon after coming home.

Sources

1. Serum symmetric dimethylarginine and creatinine in Birman cats compared with cats of other breeds. Journal of Feline Medicine and Surgery, 2018.
2. Birman. The Cat Fanciers' Association.
3. Nutritional requirements of small animals. Merck Veterinary Manual.
4. ACVIM consensus statement guidelines for the classification, diagnosis, and management of cardiomyopathies in cats. Journal of Veterinary Internal Medicine, 2020.
5. Echocardiographic evidence for myocardial failure induced by taurine deficiency in domestic cats. Canadian Journal of Veterinary Research, 1994.
6. Vomiting. Cornell Feline Health Center, Cornell University College of Veterinary Medicine.
7. Prevalence of feline infectious peritonitis in specific cat breeds. Journal of Feline Medicine and Surgery, 2006.