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World Wide Sires: Helping Farmers Reach Genetic Excellence for Over 45 Years


Who We Are


World Wide Sires (WWS) was founded in 1971 by Bill Clark, California dairyman and breeder of Cal-Clark Board Chairman (sire of Blackstar). Mr. Clark’s passion for cows and international people grew into a global business that has become a household name for farmers around the world.


In 2001, WWS was purchased by American A.I. cooperatives, Select Sires and Accelerated Genetics. The two organizations joined forces after 16 years of working with WWS to deliver industry-leading genetics to over 80 countries worldwide. Select Sires and Accelerated Genetics became a unified cooperative, with 30,000 farmer owners, in 2017. WWS continues to serve as the international marketing arm for their superior dairy and beef genetics.


The same passion for cows and people that created WWS is what drives the business today, connecting the World

Wide Sires family of distributors, sales teams and valued customers.


What We Do

WWS offers customers an unparalleled line-up with bulls excelling in TPI, Production, Management Traits, Fertility and Type. We place emphasis on quality and quantity, as we offer a large selection of bulls that are consistently rising to the top.


The world’s best product also comes with the world’s best service. Our customers and their success are our highest priority.

Why WWS?


Simply put, WWS delivers. We provide profitable genetics, superior customer service, and a dedicated team to ensure your herd’s success.


We deliver

  • A diverse selection of Daughter Proven Sires and Genomic Young Sires

  • The Holstein breed’s Top TPI Sires and their elite sons

  • Industry-leading fertility

  • The world’s largest and most successful mating program: The World Wide Mating Service (WMS)

  • A state-of-the-art Global Training Center with experienced staff and a hands-on dairy management program

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