Improving the nutritive value of Nigerian rubber kernel (Hevea braziliensis) products through processing. II. Apparent nutrient and metabolizable energy values

Authors

  • J.A. Agunbiade Department of Agriculture and Horticulture, University of Nottingham School of Agricultural and Food Sciences, Sutton Bonington, Loughborough LE 12 SRD. U.K.
  • J. Wiseman Department of Agriculture and Horticulture, University of Nottingham School of Agricultural and Food Sciences, Sutton Bonington, Loughborough LE 12 SRD. U.K.
  • D.J.A. Cole Department of Agriculture and Horticulture, University of Nottingham School of Agricultural and Food Sciences, Sutton Bonington, Loughborough LE 12 SRD. U.K.

Keywords:

Hevea braziliensis, Rubber kernels, Processing, Nutritive value, Broiler chicks

Abstract

A metabolism trial was designed to investigate the effect of method of processing (raw sundrying, oven-drying, soaking, autoclaving, and roasting), rate of inclusion (ROI), and method of estimation (regression or single-level assay) on apparent nutrient and metabolizable energy value of full-fat and fat-extracted rubber kernel meals and oil using 264 seven-day-old Ross broiler chicks. The oil and full-fat meals were incorporated at levels to provide 40, 80, and 120 g kg-1 of added oil in the basal diet. Fat-extracted meals were also included at the equivalent levels in the full-fat meals. Apparent metabolizable energy (AME) values were not significantly influenced by ROI with the values determined by regression being more precise than those estimated by single-level assay. Heat treatment generally improved AME, and for the full-fat meals, moist heating heat-processing (autoclaving or soaking prior to oven-drying) was more effective than dry-heating (oven-drying and roasting). The AME of the roasted full-fat was 16.1 MJ kg-1 dry matter (DM) while the mean value of soaked and autoclaved full-fat (21.3 MJ kg-1 DM), was significantly greater than the mena of oven-dried and roasted full-fat meals (18.7 MJ kg-1 DM). Rubber kernel oil had an AME value of 35.3 MJ kg-1 DM. An improvement in energy and nutritive value brought about by processing suggests inhibition of inherent deleterious factors, the specific nature and definite levels of which would require

How to Cite

Agunbiade, J., Wiseman, J., & Cole, D. (1996). Improving the nutritive value of Nigerian rubber kernel (Hevea braziliensis) products through processing. II. Apparent nutrient and metabolizable energy values. Tropical Agriculture, 73(2). Retrieved from https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/2558

Issue

Section

Research Papers