Page 91 - Poultry-Punch April 2020 edition

POULTRY PUNCH ARTICLE

of excessive pesticide or fungicides. oil seed meals like mahua, castor or karanja ,Gaithersburg, MD,USA,AOAC
Leather smell of meat meal indicates cake. The amount of acid insoluble ash is a International.
adulteration with leather meal. good guide to the amount of sand or other 2. AOAC,1995,Animal feed ,Chapter 4.
Taste: Each ingredient has a different dirt which may be present. Determination offficial Methods of Analysis 16th
taste; any change in the taste like bitterness of peroxide content and free fatty acid in edition (AOAC) International ,Arlington
in grains and oilseed cakes indicates the oily materials is indicative of rancidity and ,VI,USA,30pp.
presence of mycotoxin. The level of salt duration of storage, respectively. 3. Gerht ,A.J.and B.Poudstone ,(1976)
can be detected by tasting. Bitter taste Feed Manufacturing Technology
of rice polish indicates rancidity of fatty References- ,10:253-256.
acids. 1. AOAC,2000.offficial Methods 4. Jones ,F.T.( 1989), Korean
Touch: Feeling the raw material of Analysis,Seventeenth Edition J.Animal.13(1):25-39
indicates dryness. Clumps can be found
out by inserting the hand inside
the bag. The clumps may be
due to high moisture content,
improper storage, packing of
fresh warm solvent extracted
meal that crumble on application
of light pressure. Clumps formed
due to excess moisture will be
very hard.
Sound: Dry grains on
pouring down or biting will
produce sound of spilling coins,
indicative of optimum moisture
in grains. Common adulterants
in feeds and fodders: The feed
ingredients should be checked
for possible adulterants (Table
1). Adulteration is defined
as the admixture of a pure
substance with some cheaper
and low quality substance,
done intentionally usually to
make money. The common
contaminant or adulterant is
husk or sand. Winnowing is the
best method to detect husk in the
feedstuff. Sieving can be done to
differentiate contaminants based
on particle size. To detect for
the presence of sand a weighed
quantity of grain is soaked
in water and then by sieving
with hand, the grains can be
separated. The remaining water
is decanted and the settled sand
is weighed to assess the level of
contamination. Low CP and high
CF in oil seed meals is indicative
of adulteration with fibrous
material. The high CF alone is
indicative of adulteration with
urea and or some inferior quality

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