Dynamic disorders of the upper respiratory tract in warm-blooded and cold-blooded trotter racehorses

June 28, 2013, Norwegian School of Veterinary Science

(Medical Xpress)—Eric Strand's doctoral research shows that these genetically distinct breeds are predisposed to different types of upper airway problems, and this indicates that certain physical traits can be the cause of different forms of collapse in the upper respiratory tract. Strand has also developed and standardised a new diagnostic treadmill protocol for disorders of this kind, which has resulted in more accurate diagnosis and the discovery of new disorders.

All over the world, disorders of the are a frequent reason for referring horses to equine hospitals. These disorders result in increased airway resistance through the upper , which will have a negative effect on the horses' performance. There are two main categories of upper respiratory tract disorders: those that can be diagnosed while the horse is resting (static disorders) and those that can only be diagnosed while the horse is under exertion, for example on a treadmill (dynamic disorders).

Eric Strand demonstrated that cold-blooded trotter racehorses are predisposed to dynamic disorders around the , while warm-blooded trotter racehorses are predisposed to dynamic collapse of the . The flexion (bending) of the head and neck that occurs when racehorses are on the bit exacerbated most of the dynamic disorders. Strand's thesis describes dynamic laryngeal collapse in conjunction with poll (head/neck) flexion as a serious new upper respiratory tract disorder and the most common throat disorder in cold-blooded trotter racehorses. Some racehorses have gone down while racing because there is too little passage of air through their laryngeal opening, which has collapsed due to this disorder. The Norwegian School of Veterinary Science is undertaking further research into this problem, with the aim of breeding healthier cold-blooded trotter racehorses.

The purpose of this doctoral research project was to improve the current method of diagnosing disorders of the upper respiratory tract and to increase our understanding of dynamic airway disorders. During the course of the project, Strand developed and standardised a new diagnostic treadmill protocol for endoscopy with video transmission, and also established a grading system for newly discovered types of collapse of the respiratory tract in racehorses.

Dynamic disorders of the upper respiratory tract in warm-blooded and cold-blooded trotter racehorses

Strand found that cold-blooded and warm-blooded trotter racehorses had different predispositions to six disorders of the upper respiratory tract. In both breeds, dynamic disorders were more common than static .

Eric Strand carried out his doctoral research at the Equine Clinic at the Norwegian School of Veterinary Science.

DVM Eric Strand defended his PhD research on 20th-21st June at the Norwegian School of Veterinary Science with a thesis entitled: "A study of upper respiratory tract obstruction during exercise in 3 breeds of racehorses."

Explore further: Asymptomatic carriage of M. pneumoniae common in children

Related Stories

Asymptomatic carriage of M. pneumoniae common in children

May 14, 2013
The bacterium M. pneumoniae is carried at high rates in the upper respiratory tracts of healthy children and usual diagnostic tests cannot differentiate between such asymptomatic carriage and actual respiratory tract infection, ...

Children who have their adenoids out do not get fewer upper respiratory infections

September 7, 2011
Children who have their adenoids surgically removed do not get fewer upper respiratory tract infections such as sinusitis and colds, finds research published in BMJ today.

Infections increase risk of mood disorders

June 17, 2013
New research shows that every third person who is diagnosed for the first time with a mood disorder has been admitted to hospital with an infection prior to the diagnosis. The study is the largest of its kind to date to show ...

High occurrence of hereditary osteochondrosis and loose bone fragments in Norwegian standard bred trotters

October 26, 2012
A PhD research project carried out at The Norwegian School of Veterinary Science has revealed that 50.7% of Norwegian standard bred horses of the same age suffer from loose bone fragments and defects in their joints. Genetic ...

Recommended for you

Flu infection study increases understanding of natural immunity

January 23, 2018
People with higher levels of antibodies against the stem portion of the influenza virus hemagglutinin (HA) protein have less viral shedding when they get the flu, but do not have fewer or less severe signs of illness, according ...

New long-acting approach for malaria therapy developed

January 22, 2018
A new study, published in Nature Communications, conducted by the University of Liverpool and the Johns Hopkins University School of Medicine highlights a new 'long acting' medicine for the prevention of malaria.

Virus shown to be likely cause of mystery polio-like illness

January 22, 2018
A major review by UNSW researchers has identified strong evidence that a virus called Enterovirus D68 is the cause of a mystery polio-like illness that has paralysed children in the US, Canada and Europe.

Creation of synthetic horsepox virus could lead to more effective smallpox vaccine

January 19, 2018
UAlberta researchers created a new synthetic virus that could lead to the development of a more effective vaccine against smallpox. The discovery demonstrates how techniques based on the use of synthetic DNA can be used to ...

Study ends debate over role of steroids in treating septic shock

January 19, 2018
The results from the largest ever study of septic shock could improve treatment for critically ill patients and save health systems worldwide hundreds of millions of dollars each year.

New approach could help curtail hospitalizations due to influenza infection

January 18, 2018
More than 700,000 Americans were hospitalized due to illnesses associated with the seasonal flu during the 2014-15 flu season, according to federal estimates. A radical new approach to vaccine development at UCLA may help ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.