Effects of dietary n-3 polyunsaturated fatty acids and ... - FINS

1 st WorkshopXIII International Feed Technology Symposium192A COMPARISON OF THE GRAVIMETRIC ANDTHERMOGRAVIMETRIC METHOD FOR ASH CONTENTDETERMINATION IN FEEDSTUFFSMilica Pojić, Jasna MastilovićInstitute for Food Technology, Bulevar cara Lazara 1, 21000 Novi Sad, SerbiaABSTRACTAccording to national and international regulations ash represents the mandatoryparameter for feedstuffs labelling. It represents the total amount of the inorganic contentused to estimate energy and calculate non-fiber carbohydrate content of feed. Thegravimetric method is routinely performed in feed testing laboratories for ash contentdetermination. Besides, it is official and widely accepted method for ash contentdetermination in feedstuffs. Since it is characterized by different sources of uncertainties,the research on new analytical procedures has been stimulated. The thermogravimetricmethod (TGA) has already being utilized for ash determination in different kinds of food(such as coffee, milk powders, starches, flours, oil seeds etc.) since it requires shorteranalysis times, smaller sample masses and no sample pretreatment. The values for ashcontent of feed samples selected for the study measured by the TGA method were higherthan those measured by the gravimetric method. The TGA method was characterized bybetter precision in comparison to the gravimetric method. The MANOVA test (P