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Dairy Cattle Genetics

World Wide Sires, Ltd. is the international leader for supplying superior frozen semen and embryos to dairy breeders worldwide.

Top Proven Genetics:
The U.S. A.I. industry progeny test 1300 Holstein bulls annually. You will benefit from their advanced and aggressive progeny testing programs. The semen and embryo facilities of every Cooperative meet or exceed the disease-free standards of Certified Semen Services (CSS), the quality control organization which monitors all U.S. A.I. organizations.

Satisfied Customers:
World Wide Sires has provided excellent service for 40 years. Cattle breeders in over 70 countries throughout five continents have supported World Wide Sires genetics by using nearly 4 million doses of semen in 2010.

Most of the U.S. A.I. Cooperatives have 50 years of experience. They have a combined total of over 400 years of expertise in breeding experience, research, and knowledge. The World Wide Sires marketing and management team includes people with a strong agricultural education, training, and background.

Proven Results:
Bulls developed by the U.S. A.I. Cooperatives dominate Holstein-Friesian pedigrees around the world. You will recognize these famous bulls:

Round Oak Rag Apple Elevation
Carlin-M Ivanhoe Bell
Walkway Chief Mark
Bis-May Tradition Cleitus
Arlinda Rotate
Cal-Clark Board Chairman
Emprise Bell Elton
Rothrock Tradition Leadman
To-Mar Blackstar-ET
Tesk-Holm Valiant Rockie
Ha-Ho Cubby Manfred
MJR Blackstar Emory-ET
Fustead Emory Blitz-ET
Regancrest Elton Durham-ET
Mara-Thon BW Marshall-ET
O-Bee Manfred Justice-ET