The objective of this study was to determine post-mortem measurements for predicting carcass traits in growing rabbits. A total of 50 clinically healthy New Zealand White × Californian male rabbits with a body weight (BW) of 1351 ± 347 g between 60 to 80 days of age were used. Body weight was recorded 12 h before slaughtering. Data recorded at slaughtering included carcass weights (HCW). After cooling at 4 °C for 24 h, carcasses were weighed (CCW) and then were carefully split longitudinally with a band saw to obtain left and right halves. In the right half carcass, the following measurements were recorded using a tape measure: dorsal length (DL), thoracic depth (TD), thigh length (TL), carcass length (CL), lumbar circumference (LC). The compactness index (CCI) was calculated as the CCW divided by the CL. Thereafter, the right half carcass was weighed and manually deboned to record weights of muscle (TCM), and bone (TCB). The CCI explained of 93% of variation for TCM (R2 = 0.93 and a CV = 9.30%). In addition, the DL was the best predictor (p < 0.001) for TCB (R2 = 0.60 and a CV = 18.9%). Our results indicated that the use of carcass measurements could accurately and precisely (R2 = ≥ 0.60 and ≤0.95) be used as alternatives to predict the carcass tissues composition in growing rabbits.

<p><strong>Background. </strong>Carcass yield varies depending on the relative proportions of muscle, fat and bone, therefore, the possibility of predicting its value would produce valuable information that will promote the viability and sustainability of rabbit meat production. <strong>Methodology.</strong> Thirty-eight male growing rabbits (New Zealand White × Californian) with body weights (BW) of 1329 ± 291 g and from 60 to 100 days of age were used. Real time ultrasonography (RTU) measurements were taken 12 h before slaughtering. For that, rabbits were shaved between the 6^th and 7^th lumbar vertebrae. The <em>longissimus thoracis et lumborum</em><em> </em>muscle (LM) area (LDA) and also the maximum LM width (LDW) and the maximum depth LM (LDD) were measured. Data recorded at slaughtering included carcass and non-carcass components. After chilling at 4° C for 24 hours, carcasses were split longitudinally to obtain left and right halves that were later weighed. Thereafter, the right half carcass was weighed and manually deboned for recording weights of muscle (TCM), and bone (TCB). <strong>Results.</strong> The highest correlation (r = 0.84, <em>P</em> &lt;0.001) was observed between TCM and LDD, while the lower correlation (r = 0.4,<em> P</em> &lt;0.001) was observed between TCB and LDW. The BW were highly related to carcass characteristics (r&gt;0.77≤0.97). <em>In vivo</em> RTU measurements explained a low to moderate amount of variation in TCB and TCM with an r²of 0.36 to 0.77 (<em>P</em> &lt; 0.001) respectively. BW explained from 49 to 92% of variation in TCB and TCM, respectively. <strong>Implications.</strong> The <em>in vivo</em> ultrasound measurements it is a viable tool that allows predicting carcass value of rabbits.<strong> Conclusion. </strong>Our results indicated that the use of RTU measurements could accurately predict muscle from growing rabbit's carcass.</p>