Bristol Veterinary Service

08/19/2025

Here's some interesting information about Polysaccharide storage myopathy (PSSM) from our friends at Rhinebeck Equine. Have you heard about this condition before? Let us know in the comments below!

"💪🏼 Last week, we discussed Exertional Rhabdomyolysis (ER) aka tying-up. We mentioned that PSSM (Polysaccharide storage myopathy) is associated with genetic susceptibility of ER.

💪🏼 What is PSSM?
PSSM is a disorder that causes muscle soreness and tying up in horses from abnormal glycogen storage in the muscles. The two types of PSSM are Type 1 and Type 2.

♦️ PSSM Type 1 is caused by a mutation in the GYS1 gene (glycogen synthase 1). The mutation causes muscle cells to produce glycogen continually. PSSM Type 1 is more commonly observed in Quarter Horses, Paints, Appaloosas and draft breeds; however, it has been documented in 20 breeds.

♦️ PSSM Type 2 occurs without genetic mutation yet results in abnormal glycogen storage in the muscles. It is still unknown the exact cause of PSSM Type 2. PSSM Type 2 is more common in warmbloods, but it has been linked to other breeds.

🩺 What are the clinical signs?
Sweating, lameness, sore muscles, weakness, undiagnosed lameness, poor performance, and muscle tremors that may occur with or without exercise. Not all horses will exhibit severe clinical signs.

🥼 How do we test for PSSM Type 1 and 2?
Testing for PSSM Type 1 requires hair samples with the roots attached to test for the GYS1 variant. Testing for PSSM Type 2 requires a muscle biopsy.

🩸 Additional testing of insulin may be warranted due to PSSM Type 1 horses are commonly more sensitive to it. Insulin causes the GYS1 gene to produce more glycogen.

💪🏼 How do we treat PSSM once diagnosis is made?
Diet and regular exercise are crucial to managing these horses. Often these horses are on a low non-structural carbohydrate (NSC) grass hay and a ration balancer. However, each horse is an individual and may need more calories which can be achieved by adding a low-NSC or high fat feed. Additional supportive care may be necessary during an active episode of tying up.

🤔 What is the prognosis?
Sadly, there’s no cure, but with dietary and exercise management horses can do well and reduce the frequency of active tying-up episodes."

If you have any concerns about your horse exhibiting signs of PSSM Type 1 or 2, talk to your veterinarian.

📸: Dr. Laura Javsicas, ACVIM, performing a muscle biopsy.

08/06/2025

🎉 Exciting News from Bristol Veterinary Service! 🐾

We are thrilled to congratulate Dr. Curran on her purchase of our small animal division, now proudly operating as Hometown Veterinary Service! 🏥🐶🐱

While we move forward as separate practices, we will continue to share the same location at 26900 75th Street, Salem, WI, as well as the phone number: (262) 859-2560, and our existing webpage for now.

Be sure to check out and follow their journey on their new page – Hometown Veterinary Service!

We are excited to watch this fledgling clinic grow under Dr. Curran’s compassionate care and leadership. Join us in wishing her and the Hometown team every success in this exciting new chapter!

08/05/2025

08/01/2025

In this video, Dr. Marcia Hathaway, University of Minnesota, describes the important role of major and trace minerals in the horse.

07/30/2025

We hope these adorable puppies can brighten your day as much as they brightened ours! Welcome everyone to Bristol Vet! 🐾

07/28/2025

Dr. Kelly Cook saw her first wellness exam today! We are so excited to have her as a part of our team. Dr. Kelly looks forward to meeting you and your fur legged babies!🐾

07/25/2025

The term "fat leg" is pretty self-explanatory, but do you know the difference between stocking up and cellulitis?

Many horses will "stock up" with subcutaneous edema (fluid swelling) in two or more legs (usually the hind limbs). Stocking up generally results from a significant decrease in exercise and usually resolves as the horse starts exercising again.

Lymphangitis (or vasculitis, big leg disease, staph infection, or cellulitis), however, is a bacterial infection and a dramatically different condition. While its causes may vary, it’s easy to spot once it sets in. The swelling will be extreme, hot, very painful to the touch, and the horse will be depressed due to the fever and discomfort.

If you think your equine friend has cellulitis or even if you're not sure, we encourage you to seek professional help promptly. Your equine practitioner will make the best treatment recommendations, both to reduce swelling and to address any sort of bacterial infection that might be active or that could occur due to the edema in the soft tissue.

07/22/2025

As many horse owners start the process of planning out their fall and winter hay supply, many may be considering purchasing round bales for their equine companions due to cost-effectiveness and greater convenience for feeding pastured animals. However, it's important to remember that there are a few things to consider when choosing between square or round bales.

• Are you equipped/prepared to store your hay correctly?
Improperly stored round bales can lose much of their nutritional value and are also more susceptible to mold, dust, and bacteria growth, which can cause respiratory issues and even colic.

• Are your horses protected from botulism?
Round bales provide an optimum environment for the development of the botulism toxin. This toxin is produced when "Clostridium botulinum" is exposed to the right environmental conditions — such as when forage materials are baled and stored while still damp, or when they include the carcasses of dead animals, like birds and mice.

Prevention of this disease through vaccination is critical, especially in areas where the condition is prevalent (such as Kentucky, Ohio, Maryland, Pennsylvania, California, and Tennessee).

• Are round bales a good choice for your horse?
Horses prone to respiratory conditions usually have increased problems with round bales due to their higher dust content.

• Do you have a feeder to place your round bales in?
Round bales not placed in a feeder can create more waste, which means your horses may not be meeting their nutritional requirements.

• Can you secure high-quality round bales?
Not all hay is created equal. Be sure to choose high-quality hay to meet your horse's nutritional needs and minimize the risk of impaction colic, which increases with lower-quality, less digestible forage.

As always, your equine veterinarian remains your best source of information and advice—consult your horse doctor on best practices when feeding hay this fall and winter!

For more information on botulism, visit our website at: https://aaep.org/resource/botulism/

07/22/2025

Bristol Vet is happy to welcome Dr. Kelly Cook to the small animal team! Dr. Cook is a graduate from University of Missouri and is eagerly looking forward to treating your four legged friends.
She is happily accepting new patients!

07/11/2025

Welcoming loads of cuteness to the BVS family!