The adoption of cost-effective feeding regimes is essential to maintain the growth and physiological status of lambs after weaning. The economic benefits of an alternative concentrate diet for Omani lambs were also assessed. Twenty male Omani lambs (12.31 ± 3.22 kg; 5 months old) were allocated to a commercial concentrate (control) or formulated concentrate group (n = 10/treatment) for 63 days. The formulated concentrate consisted of date palm fronds (29%), barley (20%), fish meal (12%), date syrup (10%), Moringa oleifera (28%), and salt (1%), with all ingredient proportions expressed on a dry matter (DM) basis. Growth performance, feed efficiency, hematological indices, serum biochemical parameters, and cost analyses were evaluated using individual lambs as the experimental unit. Growth performance, feed efficiency, hematological and serum biochemical parameters, and cost analyses were performed. Final body weight (BW), total weight gain (TWG), average daily gain (ADG), and feed conversion ratio (FCR) were similar between the groups (p > 0.05). The average daily feed intake was similar between groups (p = 0.321). However, the feed cost per kg of gain and feeding cost were lower (p < 0.001) by 63 and 58%, respectively, for the formulated concentrate group. Time × group interactions were observed for red blood cell parameters, with higher platelet counts (p < 0.001) and reticulocyte hemoglobin content (p = 0.018) in the formulated concentrate group. The serum biochemical parameters changed over time, with similar responses between the groups. Appropriate substitution of ingredients in lamb concentrate diets with agricultural by-products positively influenced economic efficiency.
Al-Khalasi et al. (2026) studied this question.