The influence of breed and sex on saleable beef yield

Abstract

Saleable beef yields from the carcasses of 38 Brahman crossbred bullocks, 42 Brahman crossbred females, 75 Hereford bullocks and 35 Hereford females were recorded in the boning room of an export abattoir. Regressions of saleable beef yield on 12th rib fat thickness and on rump P8 fat thickness were examined for breed and sex effects. Linear regression analysis showed that rump P8 fat thickness and 12th rib fat thickness predicted percentage yield of saleable beef with prediction errors at the mean (of the predictor variables) of 2.3 and 2.1 respectively. The inclusion of hot side weight with either fat thickness measurement in prediction equations did not significantly reduce the prediction errors. Either rump (P8) fat thickness or 12th rib fat thickness alone could be used to predict the weight of saleable beef, giving a prediction error of 12.4 kg, and the inclusion of hot side weight in these equations significantly reduced this error to 3.6 kg and 3.2 kg respectively. Quadratic analysis did not improve the accuracy of the prediction of percentage yield of saleable beef from either P8 alone or P8 plus hot side weight but it did reduce the prediction errors of saleable beef weight from P8 plus hot side weight to 3.5 kg. Regressions of percentage yield of saleable beef on 12th rib fat thickness did not vary significantly between Brahman crossbred bullocks and Brahman crossbred females, but they did between Hereford bullocks and Hereford females, and between each of the Hereford groups and the Brahmans. With increasing subcutaneous fat thickness Hereford females maintained a higher percentage of saleable beef than did the Hereford bullocks. Brahman crossbred cattle showed important yield advantages (1-3%) over Hereford cattle at all levels of fat thickness studied.

Carcass traits and saleable meat yield of alpacas (Vicugna pacos) in Australia

“…EMA would be expected to improve the accuracy of predicting the weight of these cuts as this measurement is measured on the LL muscle from which the short loin is derived. However, in comparison to sheep and beef models (Ball & Johnson, 1989;Hopkins, 2008) EMA did not improve the accuracy of other models including those for the prediction of SMY (kg) from alpaca carcases. These differences may be due to the high proportion of variability being accounted for in the alpaca carcass models by HCW and in some cases gender, but suggests that the measurement of EMA is not useful for prediction models for alpaca cuts or SMY.…”

“…These are the first regression models created for alpaca carcasses and have been created using predictors and traits that are routinely (HCW and EMA) and non-routinely (carcass length) measured in abattoirs throughout Australia as predictors of specifically beef cut weights (Annonymous, 2005;Ball & Johnson, 1989). Routine measurements including HCW, EMA, and fat depth are commonly used to improve the accuracy in predicting SMY in beef and lamb carcases (Ball & Johnson, 1989;Hopkins, 2008). However, given the lack of fat on the alpaca carcasses, this measure was not a suitable predictor.…”

Prediction of retail beef yield, trim fat and proportion of high-valued cuts in Nellore cattle using ultrasound live measurements

“…Influences of breed on saleable meat yield (Ball & Johnson, 1989) and on fat partitioning within the subcutaneous depot between rib and rump sites in cattle have been reported (Hopkins et al, 1993;Walmsley et al, 2010).…”

Identifications of Carcass Characteristic for Estimating the Composition of Beef Carcass

“…Their studies concluded that many position of beef carcass in which measurement of fat thick can be conducted and given accurately carcass fat prediction. Johnson and Ball (1988), and Ball and Johnson (1989) found that there was a correlation between fat thick on the 12 th rib or rump position P8 and carcass production from a few various cattle. Hopkins et al (1993) reported that effect of a relationship cattle species among measurement of fat thick using the 12 th rib and rump P8.…”