Bulgarian Journal of Agricultural Science
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T. Ivanova, E. Raicheva
Abstract: The aim of the present study was to determine the wool production and some wool properties from ewes from Synthetic population Bulgarian milk. The study was carried out with 25 ewes at age of 18 months and 25 ewes at 2.5 years reared in
Institute of animal Science – Kostinbrod. The wool samples were taken from the sides of ewes for laboratory assessment of the fiber thickness. The thickness of the wool was measured for 100 fibres from each nonfat wool sample, in µm, by Lanimetrei MP 3, PZo, Poland with enlargement 20. During the shearing of sheep, it was measured the individual quantity of grease wool with accuracy up to 100 g. Samples were taken from different parts of the body in amount of 300 g for determining the yield and preparation of the samples for measurement of the wool’s whiteness. on base of the information for the individual wool production and yield it was calculated the quantity of clean fiber. The whiteness was assessed by photometric methods with Spekol 11 - Carl Zeiss Yena on the base of the measurements of red (X), green (Y) and blue (Z) components of the reflected
light from the wool sample. The degree of whiteness, the degree of yellowing and index of yellowing were calculated. The obtained information was analyzed by methods of variation statistics, the effect of age was established by one-way ANOVA. The significance of the influence of the studied factor was established by F-criterion of Fisher. The significance of the differences between means of the studied traits was evaluated by t-criterion of Student. The age of ewes had significant influence on the yield, clean fiber, thickness and whiteness of wool (P < 0.05) (P < 0.001). It was established negative, considerable high, significant correlation coefficients (r = - 0.51** ÷ - 0.65***) between the whiteness, degree of yellowing and index of yellowing. The ewes with 48 quality of wool had the highest percentage (over 50%).
Keywords: degree of yellowing; sheep; whiteness; wool production; yield
Date published: 2017-09-20
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