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Methodical problems of nitrogen matters determination in cow's milk

HANUS O, FICNAR J, JEDELSKA R, KOPECKY J, BERANOVA A, GABRIEL B
Veterinarni Medicina 40, 1995, 387-396

In the dairy sector, there has been a long run debate about an appropriate basis of calibration for milk protein content of routine indirect instrumental methods (IM) calibrated according to reference methods. Using traditional methods, milk protein content in per cent is given in terms of the content of so called crude protein, i.e. total nitrogen (according to Kjeldahl method) x 6.38. Indirect methods are usually calibrated for these values. In France, the content of milk true protein, that means the content of protein nitrogen (according to Kjeldahl method) x 6.38, has been used as a calibration basis for a longer time. Optimizing discussion about the aspects of suitability, accuracy and correctness as well as about the advantages and difficulties of these different approaches can be encountered in literature. The objective of the present paper is to discuss theoretical and practical problems: analyses of milk nitrogen matters


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