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Interpreting Australian Limousin Selection Indexes

There are currently three different selection indexes calculated for Australian Limousin animals. These are:

  • Domestic Maternal Index
  • Export Maternal Index
  • Northern Export Index

Each selection index describes a different production/market scenario and relates to a typical commercial herd using Limousin bulls. Producers are advised to use the selection index that most closely aligns to their production system. Each selection index is focused on efficient beef production, including maternal traits where appropriate. In addition, each selection index targets the following specifications.

Domestic Maternal Index - Estimates the genetic differences between animals in net profitability per cow joined for a typical self-replacing commercial herd targeting the domestic supermarket trade. Selected heifers are retained for breeding and so maternal traits are of importance. Steers and surplus heifers are finished on grass or a short fed grain program. Steers target 450 kg live weight (250 kg carcase weight & 8 mm P8 fat) and heifers 425 kg (235 kg carcase weight & 9 mm fat depth), at 15 months of age. In response to industry feedback; positive emphasis has been placed on the ability to meet MSA specifications.

Export Maternal Index - Estimates the genetic differences between animals in net profitability per cow joined for a typical self-replacing commercial herd targeting the heavy export trade.  Selected heifers are retained for breeding and so maternal traits are of importance. Steers and surplus heifers are finished on grass or a short fed grain program. Steers target 560 kg live weight (330 kg carcase weight & 12 mm P8 fat) and heifers 525 kg (290 kg carcase weight & 14 mm fat depth), at 22 months of age. In response to industry feedback; positive emphasis has been placed on the ability to meet MSA specifications.

Northern Export Index - Estimates the genetic differences between animals in net profitability per cow joined for a typical commercial herd where Limousin bulls are joined with Bos indicus cows in Northern Australia targeting the export trade. This index assumes all progeny will be finished on grass. At market, steers target 580 kg live weight (330 kg HSCW and 12 mm P8 fat depth) and heifers 545 kg (300 kg HSCW and 14 mm P8 fat depth) at 27 months of age. In response to industry feedback, positive emphasis has been placed on finishing ability. This index can also be used by producers in Temperate Australia that are targeting larger carcase weights.

All selection indexes are reported as an EBV, in units of net profit per cow mated ($) for a given production/market scenario. They reflect both the short term profit generated by a sire through the sale of his progeny, and the longer term profit generated by his daughters in a self-replacing cow herd (where applicable).

All selection index values have been derived using BreedObject technology. More detailed information regarding each selection index is provided on the following pages.

If you have any further queries regarding the Australian Limousin Selection Indexes, please do not hesitate to contact staff at the Australian Limousin Breeders’ Society or your BREEDPLAN processing centre.