The present study was conducted to find out the effect of long term feeding of salt treated castor (Ricinus communis) bean meal (SCBM) based concentrate mixture on the performance of stall-fed lambs. Ten male non-descript lambs (3–4 months old) were assigned equally to two dietary treatments in a completely randomized design and fed iso-nitrogenous and iso-caloric concentrate mixture containing 18% groundnut cake (GNC; Control diet) and 25% SCBM replacing 100% GNC nitrogen (Test diet) along with ad libitum Rhodes (Chloris gayana) hay for 168d. The DM intake was 562 and 573 g/d for control and test groups, respectively. The digestibility of proximate principles (DM, OM, CP, EE, CF and NFE) and fiber fractions (NDF and ADF) was similar (P>0.05) between control and test diets. The nutritive value in terms of DCP was comparable between the two diets. However, the TDN value was significantly (P<0.05) lower in the test diet (54.82%) compared to control diet (62.09%). The lambs on test diet grew (61.71±4.88 g/d) at par with those on control diet (61.45±1.56 g/d). The efficiency of utilization of DM for live weight gain was also similar in both the groups. Thus, the castor bean meal, after processing with common salt, was found to be a satisfactory protein substitute to spare 100% nitrogen moiety of groundnut cake in the diet of lambs.
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