Effects of replacing fish meal with rubber seed meal on growth, nutrient utilization, and cholesterol metabolism of tilapia (Oreochromis niloticus × O. aureus)

Abstract

A feeding trial was conducted to evaluate the effects of replacing fish meal with rubber seed meal (RSM) on growth, nutrient utilization, and cholesterol metabolism of tilapia (Oreochromis niloticus × Oreochromis aureus). Five experimental diets were formulated with 0, 150, 300, 450, and 600 g kg RSM replacing graded levels of fish meal, respectively. Each diet was randomly assigned to triplicate groups of 25 fish (initial average weight 65.3 g) per aquarium in a rearing system maintained at 29 ± 1 °C for 8 weeks. Dietary 150 g kg RSM inclusion did not affect the weight gain and daily growth coefficient, whereas these were depressed by a further inclusion. Additionally, feed efficiency ratio and protein efficiency ratio were not affected by dietary RSM inclusion regardless of inclusion level. However, the inclusion of 450 and 600 g kg RSM decreased the mid-intestinal trypsin, lipase, and amylase activities; the hepatic acyl-CoA/cholesterol acyl transferase; low-density lipoprotein receptor; and 3-hydroxy-3-methyl-glutaryl-CoA reductase activities. Similarly, dietary 600 g kg RSM inclusion inhibited the plasma catalase and hepatic glutathione peroxidase activities. These results indicated that 150 g kg RSM can be included in tilapia diets, whereas higher inclusion of RSM inhibited the growth rate, digestive enzyme activity, antioxidant capacity, and cholesterol metabolism.

Effect of replacing dietary soybean meal with pumpkin (Cucurbita pepo) seed cake on growth, feed utilization, haematological parameters and fatty acid composition of mirror carp (Cyprinus carpio)

“…Similar to our results, replacing fish meal protein with PSC protein did not significantly decrease the intake of the PSC-containing diet compared to that of the reference diet in O. mykiss (Greiling et al, 2018). Similarly, the inclusion of a rubber seed meal instead of SBM did not affect the feed intake of tilapia (Deng et al, 2017). In this study, the best FCR value was observed in the PSC66 treatment, and this positive result was also detected for WG and SGR.…”

“…mykiss (Greiling et al, 2018). Similarly, the inclusion of a rubber seed meal instead of SBM did not affect the feed intake of tilapia (Deng et al, 2017). In this study, the best FCR value was observed in the PSC66 treatment, and this positive result was also detected for WG and SGR.…”

INCLUSION OF MESQUITE POD MEAL (<i>Prosopis juliflora</i>) IN DIETS FOR NILE TILAPIA (<i>Oreochromis niloticus</i>) JUVENILES

“…Another response that favored the inclusion of MPM in diets was the enzymatic activity that is involved in amino acid metabolism (liver transamination), which did not alter its activity at the different inclusion levels. In tilapias, reductions of aspartate aminotransferase (AST) activity were observed in plant-based diets and it was suggested that the reduction occurs by distancing the nitrogen products from the oxidative pathways (Deng et al, 2017). In addition to plant sources, Xiong et al (2014) observed that high protein/ starch ratios increased AST activities.…”

Potensi Tepung Rumput Laut Ulva sebagai Bahan Pakan Ikan

“…Sebagian besar bahan baku untuk produksi pakan ikan hingga saat ini masih tergantung pada impor (GPMT, 2015). Upaya untuk mengurangi ketergantungan ini adalah dengan memanfaatkan bahan baku lokal seperti dedak, pollard, daun ubi kayu, biji karet dan biji kapuk sebagai bahan pakan ikan (Al Mahmud et al, 2012;Hassan et al, 2017;Deng et al, 2017;Kumar et al, 2014). Adanya faktor anti nutrisi seperti sianida, asam fitat atau serat kasar yang terlalu tinggi serta ketersediaannya yang relatif terbatas, menjadi kendala dalam memanfaatkan bahan baku darat tersebut.…”