MAD fibre

Method 7.3. Determination of modified acid detergent fibre (MAD fibre)... 

Procedure (ash-free MAD fibre). Place the crucible and its contents of MAD fibre in a cool muffle furnace. Increase the temperature of the furnace to 475-500°C keep at this temperature for at least 30 min and until ashing is complete. It is important not to overshoot the temperature, because the sintered crucibles will be damaged at 515°C. Remove the crucible from the muffle furnace, cool in a desiccator and weigh. 

Calculations. Subtract the weight of the empty crucible from the weight of the crucible plus MAD fibre and multiply by 1000 to give the g kg or by 100 to give the % MAD fibre in the sample DM. 

Sodium chlorite, because of its quick action and ability to bleach cotton which has not been caustic boiled, is well suited for continuous processes. It is used to an increasing extent for bleaching knitted fabrics, and it is claimed that there is substantial economy in the consumption of chlorite, especially in comparison with treatment in a winch. Man-mad fibres require quantities of about 0-15 to 0-2 per cent of sodium chlorite on the weight of the goods. With regard to cotton there appears to be little information, but it is probable that between 1 and 1-5 per cent of sodium chlorite is required. It is also necessary to add an activator to bring the/>H to between 3-5 and 4 either before or during the dwell period in the J box. 

For the other feed materials, the MAD values were established either by in vivo measurements taken from the literature and/or from INRA, or, in a very limited number of cases, from the pig or ruminant values presented in this book, when crude fibre and ADF was lower than 15 % dry matter or higher than 15 % dry matter respectively. 

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