Milk production in Morocco has increased in recent years to meet local demand. For this reason, this work was carried out in order to study the evolution of the main factors of physicochemical variation of fresh mixture milk of the cow harvested in Moroccan farms and cooperatives, by comparing them with the results of research carried out in Morocco during the last century. 52 samples were taken to represent the different periods of the year. The results showed that the physicochemical properties studied were not significantly improved over the years. Thus, the protein content (3.05%) decreased concerning the fat content (3.57%) in recent decades. This change is mainly related to lactation, cow diet and climate change. Overall, these results could help further studies aimed at controlling the physicochemical properties of milk, taking into account the factors mentioned.

The demands of quality and choice in the dairy industry require analysis of extended performance. Ancient milk protein measuring devices take a long time and provide slow and inaccurate results. This work is part of the reliable analysis of cow’s milk proteins and defines the laws linking the two parameters, total nitrogen (NT) and protein nitrogen (NP). We are studying to prove a fast and effective method for measuring the non-protein nitrogen (NPN) composition of milk that allows the direct calculation of NP from the NT value, whose objective is to adapt the calibration of the Milko Scan FT2 cow’s milk protein analysis since NPN has a direct impact on protein analysis, payment of milk, and on the manufacture of milk products. The study showed that there is a compatibility between these two parameters and gave an idea of the percentage (5.9%) of NPN in milk. New analytical solutions such as the latest generation of the Kjeldahl K-375/376 and the new Milko Scan FT2 meet these needs. Data processing is done using XLSTAT, which is free statistical analysis software.