Trent Bridge

Inaugural Bull Sale 2023 | 9 WAGYU BREEDOBJECT $INDEXES BreedObject $Indexes target economic breeding objectives based on average herd and market conditions and have generally targeted the main markets within the main production systems, combining genetic information within BREEDPLAN into one EBV for each $Index that considers productions costs and realised value. Rump Fat EBV (mm) estimates the genetic differences in fat depth at the P8 site of a 420kg dressed carcase. A higher positive EBV indicates more subcutaneous fat and earlier maturity. Retail Beef Yield Percent EBV (%) estimates the genetic differences in total (boned out) meat yield as a percentage of a 420kg dressed carcase. A higher positive EBV indicates higher percentage yield for the 420kg carcase weight. Marble Score EBV: (Aus-Meat Marble Score) is an estimate of the genetic difference in the Aus-Meat Marble Score in a 420kg carcase. Marble Score EBV utilise the Aus-Meat Marble Score on a scale of 1 to 10, where 10 is equivalent to an Aus-Meat Marble grading of 9+. Where results from the Japanese Digital Image Camera are available, marbling percentage and marble fineness are also used to calculate Marble Score EBV as the genetic correlations between these measures are very high. Larger positive values are more favourable. Marble Fineness EBV: (Marbling Fineness Index) estimates the genetic differences in the Marbling Fineness Index (degree of fleck of marbling fat) as measured by the Japanese Digital Image Camera. A more positive EBV indicates higher levels of marbling fineness. Self-Replacing Breeding Index (SRI) the self-replacing index can be used to select Fullblood bulls that will produce more profitable females when these are retained in Fullblood or Purebred herds, in addition to profitable slaughter progeny. The SRI estimates the genetic differences between animals in terms of net profitability per cow joined for production of replacement females and slaughter steers to a carcase weight of 435kg at 32 months of age. In terms of relative economic importance, the SRI places the following emphasis on these main traits: 38.5% on marble score (MS); 13% on Residual Feed Intake (RFI) feedlot; 11% on sale liveweight (which will reflect the growth potential and therefore carcase weight of an animal); 8% on meat yield; 6% on dressing percentage and 23.5% placed on other cow and calf traits. Fullblood Terminal Index (FTI) The Fullblood Terminal Index has an increased weighting on the Marble Score EBV and can be used to select bulls to produce profitable slaughter progeny where none are retained for breeding. The FTI estimate the genetic difference between animals in terms of net profitability per cow joined based on production of slaughter stock only, with a 435kg carcase from steers at 32 months of age and a 385kg carcase from heifers at 29 months of age. In terms of relative economic importance, the FTI places the following emphasis on these main traits: 64% on MS; 11% on Residual Feed Intake (RFI) feedlot; 9% on sale liveweight; 7% on meat yield; 5 w% on dressing percentage and 3% placed on other young animal traits and 0% on maternal traits. F1 Terminal Index (F1I) The F1 Terminal Index has an increased weighting on the Marble Score EBV and can be used to select bulls to produce profitable F1 slaughter progeny where non are retained for breeding. The F1 Index estimates the genetic differences between animals in terms of net profitability cow joined based on production of a 420kg carcase from steers and a 385kg carcase from heifers at 28 months of age. In terms of relative economic importance, the F1 Index places the following emphasis on these main traits: 68% on MS; 9% on Residual Feed Intake (RFI) feedlot; 4% on sale liveweight; 6% on meat yield; 4% on dressing percentage and 9% placed on other young animal traits and 0% on maternal traits.

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