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Argento
Argento is by the famous stallion Arko III. As a 4, 5 and 6 year old Argento mainly competed in age classes jumping double clears all the time.
Dollar du Murier
This stallion was a stalwart of the French team, winning the Team Gold Medal as well as Individual Silver at the World Equestrian Games in 2002. Together with his rider Eric Navet, they also represented France at the 2004 Olympic Games, were French Champions in the same year and were key members of the French team, which won the Samsung Super League in both 2003 and 2004.
Big Star
Big Star is one of the best showjumping horses in the world, with numerous high profile wins including two Olympic Gold titles under the renowned rider, Nick Skelton. Nick himself has referred to Big Star as “the best horse I have ever ridden”. It is also notable that this exceptional stallion is passing his athleticism and incredible temperament onto his progeny, making him a top choice for any jumping mare.
Cassionato
Successful international Grade A show jumper, who together with his rider Michael Whitaker was part of the British team at the 2016 Rio Olympic Games as well as the 2015 European Championships and in the same year helped Britain win the CSIO 5* Furusiyya FEI Nations Cups at La Baule, Rotterdam and Rome.
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Semen Order Form
Make sure we have all the correct details by using our online booking form
Pre Entry Health Testing
- AHT Submission Form
- Pre-entry health certificate
- EU only pre-entry certificate
- EU Guidance Notes
StalCAM
View every resident stallion live, and the yard, online now through our unique StalCAM CCTV system
Client Comments
As a breeder & stallion owner I find the service that Stallion AI offer invaluable to my business. Tullis’ team of experienced staff are, approachable, courteous & very knowledgeable when it comes to providing a complete end to end fresh/chilled semen delivery service.— Rebecca Fallows-Battersby, LG Sporthorses
Without exception they are extremely reliable, flexible & professional on how they deliver their services.
AI Equipment Sales
Twemlows Stud
Welcome to Stallion AI Services
Stallion AI Services has been successfully practising AI for over 18 years. The centre is owned and managed by Tullis Matson.
We have collected semen from over 600 stallions and carried out over 11,000 collections.
We boast the latest technology in our laboratory, which is envied and admired by breeders throughout the world and we offer a wide range of services including semen freezing and storage, fertility testing, fresh and chilled semen distribution, mare insemination centre, training courses and AI equipment.