The 2015 most popular beef AI sires that were used in suckler herds have now been revealed. These lists see a Limousin bull HCA (Hauteclair) come to the top siring a total of 9,763 calves in suckler herds 2015. Hauteclair (HCA) (Pictured Above) had 9,763 calves registered to him in suckler herds in 2015 more than any other bull. Charolais sire Lisnagre Elite (ET) (LGL) was top of the Charolais list with 7,220 calves registered to him in suckler herds in 2015.