The aim of the research was to compare the thickness and the medullation of white and coloured wool from alpacas of different ages. The colour of the wool did not significantly affect the thickness and degree of medullation of the alpaca wool. Discontinuous medullas are found even in very fine hair. With age, the mean fibre diameter increased; the share of non-medullated fibres in the fleece decreased; and the share of medullated fibres, especially those with an discontinuous medulla, increased.

The composition of muscle fibers is influenced by animal breed or age. In our study we found  differences in fiber diameter between  sheep breeds. Lambs of a more primitive breed were characterized by smaller diameters of all fiber types. The study has shown that the diameters of muscle fibers in the examined muscles increase with age. It was also stated that the muscle type, animal genotype and body weight at slaughter influence the chosen meat quality attributes.

In this work, alpaca wool thickness and medullation characteristics were analyzed based on the animals' sex and color. The wool of females was thinner and had a lower medullation percentage than for males. The share of non-medullated fibers in the area up to 30 µm was also greater in the wool of females than for males. Light wool was thinner and had a lower degree of medullation than dark wool. The discontinuous and continuous medullated light fibers were thinner than those of dark fibers.

In an experiment the longissimus lumborum and gluteus medius muscles were collected from lambs of two genotypes to analyse physico-chemical traits, fatty acid profile, taurine, carnosine, and L-carnitine. Results showed a greater impact of the lamb’s genotype on physical traits of meat than on its chemical composition and content of bioactive components. Muscle type had an effect on meat colour; collagen content; fatty acid profile; and the amount of taurine, carnosine, and L-carnitine.

The research was carried out on lamb meat to determine the physicochemical characteristics and oxidative stability of lipids. The analysis was performed on fresh and 14 d aged longissimus lumborum and gluteus medius muscles. The meat aging determined all physicochemical features except protein and fat content. The tenderness of meat was better in muscles aged for 14 d. The muscles differed in the degree of lipid peroxidation in both fresh and aged meat.