Chemical composition and anti nutritional factors in karanja (Pongamia pinnata) seed kernels and its in vitro evaluation

Abstract

Karanja (Pongamia pinnata) seeds collected from different places of Karnataka were analyzed for morphological measurements, chemical analysis and anti-nutritional factors like karanjin, pongamol, trypsin inhibitors. Variation were observed in seeds size (1.18–1.68 g), CP (14.46–23.09%), fat (30.76–39.99%), and ANF’s like karanjin (0.57 to 1.75%), pongamol (0.25 –1.27%) and trypsin inhibitor activity (790–1278 μg / g seed meal). Further, karanja seed meal (KSM) and Karanja defatted meal (KDM) were incorporated in concentrate mixtures at graded levels (25, 50, 75 and 100%) to replace standard soybean meal. To this effect, 9 iso-nitrogenous concentrate mixtures were prepared using (C1 to C9) with 4 levels of replacement (25, 50, 75 and 100% on nitrogen basis) with KSM (C2 to C5) KDM (C6 to C8) and C1 as control. IVDMD, IVOMD (%) followed a decreasing trend when KSM was added to concentrate mixtures whereas complete removal of oil (KDM) resulted in similar trend as that of control. However, both KSM and KDM did not exert any effects on rumen fermentation parameters. Results obtained in the study indicated variation in chemical constituents, ANF’s in the seed samples collected across Karnataka and complete removal of oil from karanj seeds caused beneficial effects on nutrient digestibility in vitro.