Signet, part of AHDB, provide the Sheepbreeder recording scheme. This uses breeding information (sire, dam, date of birth, etc) and performance information (weights, ultrasonic measurements for eye-muscle and fat) to provide Estimated Breeding Values (EBVs) for various traits. The main traits are 8 week weight, Mature Size, Litter Size, Maternal Ability, Scan Weight, Muscle Depth and Fat Depth. Some breeders have also been taking advantage of CT technology to enable the production of a Gigot muscularity EBV.
Some of the EBVs are combined into an Index. In the case of Suffolk's and other terminal sires, the index objective is to select superior animals to increase lean meat yield in the carcase whilst limiting any associated rise in fatness.
The Signet evaluations are analysed by Egenes at SAC and are supporte with funding from Eblex, HCC and QMS levy boards.
For more information see the Signet website.