AbstractThe first results are reported of collaborative work carried out, under the aegis of the Agricultural Research Council, at 13 different laboratories to assess different laboratory procedures for the evaluation of quality in protein concentrate feedingstuffs.In all, 130 samples of seven different types of protein concentrate were evaluated by the Gross Protein Value (GPV) procedure as supplements to cereal protein for chicks and in addition Net Protein Utilisation (NPU), with the samples as the sole protein source for rats, was determined for a limited number.Various chemical and microbiological procedures were applied to the samples in the collaborating laboratories. For fish, meat and whale meals the ‘available lysine’ procedure based on the reactivity of ϵ‐amino groups in the lysine units with fluoro‐2,4‐dinitrobenzene correlated best with the GPV results. For cottonseed meals the results of nitrogen solubility tests correlated well with GPV. Microbiological procedures also yielded some useful co
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