Substitution of de‐oiled rice bran with Khejri pod meal and groundnut oilcake with Khejri seed meal in the diet of Labeo rohita (Hamilton, 1822)

Abstract

Two 45-day experiments were conducted to substitute the de-oiled rice bran (DORB) with Khejri pod meal (KPM) and groundnut oilcake (GNOC) with Khejri seed meal (KSM) in the diet of rohu, Labeo rohita. In the first experiment, diets comprised 0, 50, 100 and 150 g KPM kg−1 diet and denoted as CP, KPM5, KPM10 and KPM15, respectively, while in the second experiment, the diets contained 0, 50, 100 and 150 g KSM kg−1 diet and designated as CS, KSM5, KSM10 and KSM15 respectively. We randomly distributed 120 fish (mean weight- 5.10 ± 0.05 g) to twelve experimental tank following completely randomised design. Dietary KPM did not influence the growth rates, feed conversion ratio, body indices, body composition and survival (p > 0.05). No differences were observed in digestive, metabolic and stress enzymes activities (p > 0.05). In the second experiment, significantly higher growth performance and feed conversion were found in KSM5 and KSM10 (p < 0.05). However, these were similar in control and KSM15-fed groups (p > 0.05). Intestinal protease activity (r = 0.65), hepatic alanine aminotransferase (0.94–0.95) and aspartate aminotransferase in muscle (r = 0.93–0.94) were positively correlated with growth indices. Hepatic lactate dehydrogenase and catalase activity were significantly higher in KSM15-fed group (p < 0.05). Based on the results, 50% substitution of DORB and GNOC with KPM and KSM could be possible in the carp diet respectively.