[Influence of endogenous factors on the ash, calciu, magnesium, potassium, sodium, phosphorus, zinc, iron, copper and manganese contents in the bristles of pigs. 4. Effect of time of cutting and heredity on the inorganic components in the hair of the pigs (bristles of sows and piglets, newly grown hair)].

Samples of sow bristles were examined every 3 months. The results obtained confirmed the monthly gathered experimental data on the ash content and the Ca, Mg, K, and Na content (P less than 0.05-0.001) of Boar Bristles. Similarly, investigations made every 3 months showed a significant seasonal influence on the concentration of these mineral components in the bristles of the pigs (P less than 0.05-0.001). A comparison was made between newly grown hair and original bristles showing the presence of other yet unknown factors that had a controlling influence on the mineral composition of the hair. The inorganic components in the short newly grown hair were not different from those found in analogous long hair.