Before SBL finally decided to build its own bull stud (USSL,1974-75), its bulls were scattered in various bull studs at various times and semen available through contracted distributors.
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| Curtiss Breeding Service ad in betterbeefbusiness July 1970 |
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| from Simmental Shield magazine August 1970, p. 45 |
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| SBL ad in betterbeefbusiness October 1970 |