Abstract. The most important nutrients affecting wool production include sulfur amino acids, such as methionine, and minerals, such as zinc, and their deficiency may cause wool production decrease. The aim of this study
was to evaluate an effect of zinc and methionine chelate addition on the qualitative characteristics of Merino ewes
wool and zinc content in wool fibers and on their surface. Histological evaluation of fibers was also performed.
The study included 22 Polish Merino ewes divided into two groups: control and experimental (0.4 g chelates
daily per head). The experiment lasted for 4 months (3.5 months of pregnancy and 2 weeks of early lactation).
The length, thickness and breaking force of wool fibers were higher in the experimental group compared to the
control group. Higher content of zinc in wool of sheep from the experimental group was also demonstrated. The
histological structure of fibers from both groups did not differ, as the content of zinc on their surface. It can be
concluded on the basis of the obtained results that the addition of chelates favorably influenced the thickness
compensation of wool fibers and amount of wool obtained from sheep during pregnancy and early lactation, as
well as mechanical features of wool.