4/ MAY 2010 THE RIDER


The Rider is the Official Voice of the following Associations


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Ontario Icelandic Horse Association


U of G Researchers First to Identify a Family of Intersex Horses


Koko the horse appeared to be a typical mare, but when she became overly aggressive and tried to mount other mares, her owner became suspi- cious. After a barrage of tests at the Ontario Veterinary College, researchers discovered that Koko was, in fact, a male horse that appeared to be female.


Central Ontario Pleasure Driving Association


The scientists tested Koko’s rela- tives and found that her sister Sequoia and her cousin Pandora were also intersex.


Researchers Allan King, Tracey Chenier and Daniel Villagomez are the first to identify a family of horses with a rare genetic abnormality called pseu- do-hermaphroditism, which causes genetically male horses to appear female on the outside.


Eastern Ontario Pleasure Driving Society


This discovery has caught the attention of media across the country and has been featured in Macleans.ca, CBC.ca, Yahoo News, AOL News, CTV.ca and several other radio, print and online media.


Initially, they thought Koko had an ovarian tumour, which can cause mares to exhibit stallion-like behaviour because of heightened lev- els of testosterone. But when they examined the animal’s reproductive system, the researchers found Koko had internal testes.


closely it was determined the horses had an intersex condition.”


Finding related horses with this condition raises questions about how common this genetic abnormality is and whether it is fair for horses with this condition to race, he added. “Nobody knows who they should race against - fillies or colts.”


Week 2010 Horse


It’s linked recessively to the X chro- mosome and passed through the female line.”


The researchers suspect Koko’s mother has a mutation on her X chro- mosome that causes male offspring to appear female. Female offspring show no abnormalities but can, in turn, pass it on to their male offspring.


“It was a very exciting discov- ery,” said Chenier. “To be expecting a tumour but discover an entirely differ- ent internal system than anticipated sparked a lot of questions.”


The research team then conduct- ed a karyotype analysis, which is a detailed study of an animal’s chromo- somes, and results showed that Koko had a male genotype (XY).


Currently, the team of researchers is looking for the genetic mutation that would cause androgen receptors – those that respond to the male hormones that are responsible for secondary sex characteristics – to be underactive.


“Because these horses are from the same family line, the condition is likely a genetically heritable one,” said Chenier. “A very similar condition can occur in humans with what is known as androgen insensitivity syndrome.


testes, researchers performed surgery to remove them in the hope that she would become less aggressive. “Before the surgery she was so aggressive that it was too dangerous to ride her,” said the owner Sam Camp- bell. “But she is completely different now. She is an incredibly lovely horse.”


Once the mutation is located, a better tool could be developed to test animals suspected of having the condi- tion.


“We are studying the DNA, molecule by molecule, to try and determine what the mutation is and how we can more easily diagnose this disorder in horses,” said King. After realizing Koko had internal


From Our Founder Remembering May 1976


Ontario Combined Driving Association


The CHSA and the NEF, better known back in 1976 as the Canadian Horse Shows Association and the National Equestrian Federation, attempted to take over the sanctioning of Western Horse shows. They published a rule book which contained plagiarized Western Breed Association rules with the plan of forc- ing shows to use these rules. The rules of the AQHA and others were no longer needed. Such fools they were to think that a western breed association would sanction a show using these ill conceived rules. The plan ended in disaster. What became of this was the Canadian Equestrian Federation, which took a long time in recognizing the western horse industry. They seemed to be protecting the money and reserving it for the English equestrian. Times sure have changed.


The Ontario Appaloosa Horse Association sponsored the 19th Annual Canadian National Appaloosa Show at London Ontario.


Ontario


Competitive Trail Riding Association


The Cedar Valley Riders hosted the Burlington sev- enth annual Youth Show at Bayview Park on June 19, 1976.


Ancaster, Ontario Realtor John Voortman, 48, won the provincial PC nomination for Wentworth North


Since then both Sequoia and Pan- dora have undergone the same proce- dure at the Ontario Veterinary College. Although sex development disor- ders are rare, two racing standardbred horses in the United States were recently diagnosed with a similar intersex condition. The two animals turned out to be related to one another, but not to the horses found in Ontario, said King.


The two cases in the U.S. were discovered after repeated drug tests found high testosterone levels. “It was initially assumed the high levels of testosterone were due to steroid use, but when examined more


Riding, John and his family were avid horse owners. The Voortman’s went on to found the Oakrun Farm Bakeries. He did not win the election.


The Leeds and District Western Saddle Club held a contest for their junior riders to design a saddle club crest.


John Dalton, a top Rodeo cowboy from Cheyenne, Wyoming, was killed in a roll over accident. Dalton competed in all rodeo events during the 40’s and 50’s.


Danna Heard won Mr. Shur Gain 1976 at the Ontario Quarter Horse Association’s Quarterama ‘76.


The Moon Ranch in New Mexico advertised in The Rider for an apprentice to work on their horse and cat- tle ranch. The applicants were to be 18 to 25, male or female.


The Burlington- Aldershot Lions Club held their annual all breed show on June 18, 19, 20.


The Ontario Rodeo Association O.R.A. offered Life Memberships at $300.00 and seniors at $200.00.


The Rider had a very moving “In Memoir” for a cow- boy who “RHODE” out of the east. George Robert Harvey born 1910, better known as Dusty Rhodes traveled the entire continent with various Wild West Shows, Rodeos and Carnivals. With his wife Dixie they established their own show performing trick rid-


Horse Week 2010 will begin Sat- urday May 29, 2010 and run until Sunday June 6, 2010. Horse Week is held annually to promote and cele- brate Canada’s thriving horse indus- try. A wide range of activities are held across the country, including trail rides, horse shows, charity events, open houses, etc. to allow horse enthusiasts and the public alike to cel- ebrate horses!


Everyone is encouraged to orga- nize or participate in a Horse Week event. All events taking place between May 29 and June 6 can apply for Horse Week status and be promot- ed through the OEF and Equine Cana- da. Put on your thinking caps and come up with a unique idea to cele- brate, all events will be considered, regardless of size.


If you are organizing an event, please visit the OEF website for sup- port material and helpful tips for run- ning a successful event. Please visit www.equinecanada.ca to register your event online.


Ontario Reined Cow Horse Association


Ontario Team Cattle Penning Association


ing, roping, bull whip tricks and cowboy singing. Below is a poem written by Dusty.


HOW WILL I BE REMEMBERED By Dusty Rhodes


How will I be remembered? What will they say about me? Those whom I hold so dear. What will they best remember? When I am no longer here.


Will they recall mistakes I’ve made? Battles I’ve never won?


Moments of pain I’ve caused them? Things, I’ve left undone?


Will they censor my human feelings? And which I’d been noble and strong Will they scoff at the hopes I nurtured? The dreams that somehow went wrong?


Or will they be moved by compassion Directed from heaven above. To temper their judgment with kindness, And soften their memories with love


On that note I will end this installment of Remembering May 1976.


President: www.orangeapeel.com for canine cancer support www.smilingblue


Aidan W. Finn CD


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