Factors Affecting the Metabolizable Energy Content of Rapeseed Meals

Abstract

Seven samples of rapeseed meal were utilized to study the factors associated with variation in metabolizable energy content. Nutritional factors related to metabolizable energy were determined in each sample (crude protein, crude fiber, ether extract, sugar, starch, and available carbohydrates). Gross energy was determined and measurements for metabolizable energy were carried out using the chick procedure. Correlation coefficients were calculated between metabolizable energy and energy factors in rapeseed meal.Results showed a high degree of variation in protein, ether extract, sugar, and available carbohydrate content in the rapeseed meal samples. Metabolizable energy showed a range between 1492 and 1957 kcal/kg. Calculated analysis using two regression equations are shown for metabolizable energy. These regression equations may be utilized to predict metabolizable energy level in rapeseed meal or similar samples. Significant correlation coefficients were observed between metabolizable energy and ether extract plus sugar plus starch or ether extract or available carbohydrates or crude fiber (negative).

Metabolisable energy value of rapeseed meal and its fractions for chickens as affected by oil and fibre content

“…It agrees well with the conclusions of Nwokolo and Bragg (1978). The equation coefficients indicate that AME N of RM is reduced by 0.3 MJ for each per cent of increase of crude fibre and is raised by 0.2 MJ for each per cent of increase in crude fat content.…”