does the 9-11th rib composition correspond with body composition in fat-tailed afshari lambs?

To predict body composition of growing afshari fat-tailed lambs using the 9-11th rib composition as a predictor of whole body composition, 10 lambs were randomly selected (43.9 ± 3.9; mean shrunk body weight; mean ± sd) and harvested accordingly. after slaughter, the 9-11th rib sections were harvested from chilled carcasses for 24 h; fat, lean, fat-tail and bone were weighted separately and total separable fat (without fat-tail) and lean were grounded twice to obtain a homogenous sample for further chemical analysis. rib dissection separable lean, fat and bone percent were (mean ± sd) 33.9 ± 6.6, 23.6 ± 6.6, and 17.3 ± 7.4, respectively. in addition, rib dissection ether extract, crude protein, moisture, and ash percent were (mean ± sd) 27.6 ± 4.1, 19.3 ± 0.7, 49.6 ± 5.3, and 1.7 ± 0.3, respectively. except for carcass separable bone percent (with and without fat-tail), it was shown that the 9-11th physical rib composition can properly predict the carcass separable fat (adjusted r2 of 0.62 and 0.86 with and without accounting for fat-tail, respectively; p > 0.01) and lean (adjusted r2 0.77 and 0.71 with and without accounting for fat-tail, respectively; p > 0.01). as for the carcass chemical composition, with or without accounting for fat-tail, none of rib chemical commotion based on as-is analysis predicted chemical carcass composition. however, when as-is data were represented as soft tissue dry matter, only rib crude protein (%, without accounting for fat-tail) could predict carcass crude protein (adjusted r2 = 0.60; p > 0.005). in general, our results for the first time in fat-tailed sheep, showed that the 9-11th rib section can only predict physical, but not chemical, composition of fat-tailed lamb carcass.to predict body composition of growing afshari fat-tailed lambs using the 9-11th composition as a predictor of whole body composition, 10 lambs were randomly selected (43.9 ± 3.9; mean shrunk body weight; mean ± sd) and harvested accordingly. after slaughter, the 9-11th rib sections were harvested from chilled carcasses for 24 h; fat, lean, fat-tail and bone were weighted separately and total separable fat (without fat-tail) and lean were grounded twice to obtain a homogenous sample for further chemical analysis. rib dissection separable lean, fat and bone percent were (mean ± sd) 33.9 ± 6.6, 23.6 ± 6.6, and 17.3 ± 7.4, respectively. in addition, rib dissection ether extract, crude protein, moisture, and ash percent were (mean ± sd) 27.6 ± 4.1, 19.3 ± 0.7, 49.6 ± 5.3, and 1.7 ± 0.3, respectively. except for carcass separable bone percent (with and without fat-tail), it was shown that the 9-11th physical rib composition can properly predict the carcass separable fat (adjusted r2 of 0.62 and 0.86 with and without accounting for fat-tail, respectively; p > 0.01) and lean (adjusted r2 0.77 and 0.71 with and without accounting for fat-tail, respectively; p > 0.01). as for the carcass chemical composition, with or without accounting for fat-tail, none of rib chemical commotion based on as-is analysis predicted chemical carcass composition. however, when as-is data were represented as soft tissue dry matter, only rib crude protein (%, without accounting for fat-tail) could predict carcass crude protein (adjusted r2 = 0.60; p > 0.005). in general, our results for the first time in fat-tailed sheep, showed that the 9-11th rib section can only predict physical, but not chemical, composition of fat-tailed lamb carcass.to predict body composition of growing afshari fat-tailed lambs using the 9-11th composition as a predictor of whole body composition, 10 lambs were randomly selected (43.9 ± 3.9; mean shrunk body weight; mean ± sd) and harvested accordingly.