## 3 Results and Discussion  
### Carcass and Physico-Chemical Traits  
Growth performance results (body weight, feed intake, and feed conversion ratio) regarding all reared chickens (120) are reported by [PERSON] et al. [12]. Final body weight (BW) and carcass traits of slaughtered chickens are reported in Table 2.  
Diet did not affect (\(p>\) 0.05) final BW and carcass traits. Similarly, [PERSON] and [PERSON] [30] found that the different dietary protein sources (wheat middlings-based diet containing soybean vs. micronized-dehulled peas) did not affect the BW of Hubbard broiler chickens. Our carcass traits results are consistent with those of previous studies regarding the effects of diets containing peas or soybean [23; 30]. [PERSON] et al. [31] found a lighter carcass in slow-growing chickens fed with the partial substitution of soybean with extruded fava bean, while no differences were reported for dressing percentage and other carcass traits. Differently, [PERSON] et al. [8] found a lower body weight gain and carcass cuts (breast and legs) weight in chickens (Ross 308) fed with legumes (pea or fava bean) compared to those fed with genetically modified soybean meal; however, they did not observe significant differences in neck and wing weights, and in carcass, breast, neck, and wing yields. Genotype had strong effects on the slaughter BW and carcass characteristics (Table 2). Compared with KB chickens, NR chickens were heavier (\(p<0.01\)) with higher carcass and cuts (breast, legs and wings) weights (\(p<0.01\)); in addition, NR showed higher carcass and breast yields (\(p<0.01\)), while leg and wing yields were similar (\(p>0.05\)) between the studied genotypes. The results observed for the carcass traits could be explained by the greater adaptability of NR birds to the management and environmental farm conditions as reported in our study [12] and by the positive correlations between live weight and the weights of carcass parts [32]. Breast muscle, the main valuable part of the carcass, expressed as a percentage (ranging from 21.18 to 22.67 %), calculated as breast meat weight divided by hot carcass weight, is similar to that reported in the medium-growing chicken Hubbard JA757 [33] and higher compared with slow-growing ISA Dual chickens. Significant interaction (\(p<0.05\)) effects of diet and genotype on the breast weight and yield were observed (Table 2). This result highlights that the KB birds had a higher breast weight and breast yield when fed with a soy diet, while NR birds showed higher values when fed with a pea diet (breast weight: KB-SOY: 348.2 g; NR-SOY: 396.6 g; KB-PEA: 307.6 g; breast yield: NR-PEA: 424.4 g; KB-SOY 21.63%; NR-SOY: 21.93% g; KB-PEA: 20.72%; NR-PEA: 23.41%). Physico-chemical properties of breast muscle are reported in Table 3. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**Diet (D) a**} & \multicolumn{2}{c}{**Genotype (G) b**} & \multicolumn{4}{c}{**Significance**} \\ \cline{2-9}  & **SOY** & **PEA** & **KB** & **NR** & & **D** & **G** & **D \(\times\) G** \\ \hline Final body weight, g & 2800.0 & 2677.5 & 2560.0 & 2917.5 & 44.98 & ns & ** & ns \\ Carcass weight, g & 1709.0 & 1641.5 & 1540.0 & 1810.5 & 28.58 & ns & ** & ns \\ Carcass yield, \% & 61.02 & 61.18 & 60.12 & 62.08 & 0.28 & ns & ** & ns \\ Breast weight, g & 372.4 & 366.0 & 327.9 & 410.5 & 8.11 & ns & ** & ** \\ Breast yield, \% & 21.78 & 22.07 & 21.18 & 22.67 & 0.23 & ns & ** & ** \\ Legs weight, g & 560.8 & 538.3 & 498.5 & 600.6 & 9.78 & ns & ** & ns \\ Legs yield, \% & 32.80 & 32.80 & 32.38 & 33.22 & 0.25 & ns & ns & ns \\ Wings weight, g & 175.7 & 169.0 & 160.9 & 183.8 & 2.91 & ns & ** & ns \\ Wings yield, \% & 10.31 & 10.36 & 10.50 & 10.17 & 0.12 & ns & ns & ns \\ \hline \hline \end{tabular}  
* SOY = control diet including flaked soybean (3.39 g/100 g DM); PEA = experimental diet including pea beans (6.78 g/100 g DM); b KB = Kabir Rosco Plus; NR = New Red. HMC = Water holding capacity; SEM = standard error mean; ns = not significant (\(p>0.05\));  
\end{table}