Jurors in the federal trial in Amarillo deliberated for about two hours late Friday before resuming Monday.
Two quarter horse breeders in 2012 sued the Amarillo-based AQHA in federal court, raising antitrust issues and challenging a ban on clone registration.
Association's lawyers say a cloned horse doesn't come from a registered mother and father, which is one of the group's rules for listing. The association does register horses that have been bred using other breeding technologies.
An AQHA attorney says the 280,000-member association has the right to set its own rules for issuing and maintaining pedigree records for American quarter horses.
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