[Distribution of calcium contents in commercially-produced feed for laying hens]

In this paper the quantitative distribution of the quality feature "calcium" in mixed feed for laying hens is dealt with. The magnitudes of the partial error complexes "measuring technique", "materials", "man" and "machine" which affect the total error have been determined using methods of mathematical statistics. They are discussed in terms of the total error. In the example under investigation, the contribution (presented in the form of the variance) of the measuring technique to the total error is almost 5%; that of the raw materials, nearly 10%. Amounting to more than 80%, the partial error complex "machine/man" exerts a dominant effect on total variance.