77 sows were used in a trial bristles were taken from these animals (a) on the 84th day of pregnancy, (b) on the day of gestation and (c) on the 42nd day of lactation. The average ash content of the bristles was 1.23%. It was not found to be influenced by gestation. Before gestation the Ca content of the bristles rose significantly while the Na and K content decreased (P less than 0.05). The Mg, P and Cu content of the bristles increased during lactation whereas the F content fell significantly. The concentrations of all other elements did not change significantly in the phase of pregnancy and during lactation.
Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/gaan19 Der Einfluß endogener Faktoren auf den Asche-, Kalzium-, Magnesium-, Kalium-, Natrium-, Phosphor-, Zink-, Eisen-, Kupfer-und Mangangehalt der Schweineborste Abb. 3. Dcr P-, Zn-, Fe-, Cu-und Jln.Gelialt der Schweineborsten in AbhLngigkeit von der Lebendmasse Aiistieg des Fe-Gelinltes dcr Borsten init zunelinicndcr AJasse clcr Versuchstieru bednrf dnher IIOCI~ d~r Iinu~alen B~f l ; l a r~~~g .Die Variationen ini Zn-, (31-iind ;\In-Gehnlt sind iinYerliiiltnis ZII den bcidenanderen I
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.
Sex-specific hormones were found to influence the bristle's mineral content. The bristles of female (N=151) and male (N=152), 42-day old piglets did not differ in the proportion of the elements under study (P greater than 0.05). The bristles of 36 female and 36 male castrated fattening pigs in the 40-110 kg weight range did not reveal significant differences either (P greater than 0.05). The bristles of sows and boars showed differences in the contents of ash, Mg, K, Na, P, Zn and Mn (P greater than 0.05) as well as in the contents of Fe (P greater than 0.01) and Cu (P greater than 0.05). The difference for the Ca-content could not be statistically secured (P greater than 0.05). The content of the bristle or hair of sexually mature animals in certain elements is influenced by sex hormones and should be regarded as a secondary sexual characteristic.
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