Evaluation of chemical composition of raw and processed tropical sickle pod (Senna obtusifolia) seed meal

Augustine C.1*, Kwari I.D.2, Igwebuike J.U.2, Adamu S.B.2

1Department of Animal Production, Faculty of Agriculture, Adamawa State University, Mubi, Adamawa State, Nigeria
2Department of Animal Science, Faculty of Agriculture, University of Maiduguri, Borno State, Nigeria

(Manuscript received 12 April 2017; accepted for publication 2 June 2017)

Abstract. A laboratory analysis was conducted to evaluate the chemical composition of raw and differently processed Senna obtusifolia seed meal. Senna vobtusifolia seeds were processed using boiling, soaking, sprouting and fermentation methods respectively. The processed and raw seed meals were milled and the representative seed meal samples were analysed using standard laboratory methods. The results of the chemical analysis revealed that Senna obtusifolia seed meal possessed good nutritional properties (23.40 – 25.90% crude protein and 2.14 – 2.86 MJ/kg metabolizable energy) and has good amino acid profile as an alternative feed source for livestock. However, the raw seed meal contains 378.5, 247.2, 102.0, 248.6 and 190.0 mg/100.0g of tannins, phytates, oxalate, alkaloids and saponins, respectively. The different processing methods were observed to be effective in reducing the level of the antinutrients with fermentation recording the highest reduction levels of 68.25, 66.32, 43.70, 58.07 and 44.30% for tannins, phytates, oxalate, alkaloids and saponins followed by boiling with reduction levels of 66.27, 46.97, 46.97, 47.89, 58.66 and 45.78% for tannins, phytates, oxalate, alkaloids and saponins, respectively. In conclusion, Senna obtusifolia seed can be effectively process for utilization as feed ingredient using fermentation. Feeding trial should be conducted using Senna obtusifolia seed meal to evaluate the feeding value in livestock especially monogastric animals.