We carried out this study for the purpose to obtain an index as to the quality of beaver lambs (Biberlamm) made from sheep skins in Japan, and to determine the conditions of the manufacturing process by examining each process in order to estimate the quality of the intermediate products and final products.We used the skins of 24 male lambs of corriedale strains which were fed under the definite conditions and slaughtered at 8 or 10 months old.This study consisted of: (1) The results of these experiments are as follows.and elongations and those of raw skins showed no difference of statistical significance.3. The tensile strength of fur-leather from lambs whose growth rates were good and slaughtered at 8 months of age ranged from 201-338 kg/cm2, averaging 265 kg/cm2, whilethose whose growth rates were bad and slaughtered at 10 months of age ranged from 124-200kg/cm2, with an average value of 167kg/cm2. Comparison of these average values showed significant differences at the one percent level.4. Residual fat in the final products was found in the leather of sheep weighting more than 45kg and slaughtered at 8 months of age, but it was not proportional to the skin weight or thickness of the wool skins.5. There were differences among the strains in the lustre of the wool and the tendency of moire, and partial correction was achieved by ironing.6. The weight of final product per D. S. was 10.7g and it is considered to be light.
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