Table 5.
Comparison of non-invasive techniques (reference: lean meat % from dissection)
| Accuracy (alone for pigs) | |||||||
|---|---|---|---|---|---|---|---|
| R 2 | r.m.s.e. | R 2 | r.m.s.e. | ||||
| Method | Reference tissue | Carcass | In vivo | Scan time whole body | X-radition exposure (mrem) | ||
| CT | Lean meat (%) | <0.99 | >0.54 | <0.94 | >1.00 | 5 to 30 s | 9 to 15 |
| MRI | Lean meat (%) | <0.98 | >0.62 | <0.87 | >1.20 | 15 to 30 min | None |
| DXA | Lean meat (%) | <0.91 | >0.82 | <0.72 | >1.75 | 7 to 13 min | 0.03 to 0.06 |
| US | Lean meat (%) | <0.77 | >0.70 | <0.53 | >1.95 | – | None |
CT=computed tomography; MRI=magnetic resonance imaging; DXA=dual-energy X-ray absorptiometry; US=ultrasound.
Carcass: CT data from Judas et al. (2005), Romvari et al. (2006), Vester-Christensen et al. (2009), Monziols et al. (2013); MRI data from Baulain and Henning (2001), Mitchell et al. (2001), Baulain et al. (2003), Collewet et al. (2005); Monziols et al. (2006); DXA data from Bernau et al. (2015); Dunshea et al. (2007) (ewes and wheters: % chemical lean: R 2=0.94); and US data from Branscheid et al. (2011).
In vivo: CT data from Romvari et al. (2005) (no error terms provided); MRI data from Baulain and Henning (2001) (R 2=0.91, r.m.s.e.=1.90% in lambs), Mitchell et al. (2001), Scholz (2002); DXA data from Scholz and Förster (2006), Mitchell et al. (2002) (pigs: R²=0.84 for chemical lean %); and US data from Youssao et al. (2002), Doeschl-Wilson et al. (2005).
References before 2010 in Supplementary Material S1.