The Season Effects and Shearing Time on Wool Production, Breaking Resistance, Fibre Diameter and Fiber Length of Baluchi Sheep Breed
2009
Salehi , Mahnaz
The shearing time (shorn once and twice in year) and season effect (spring and summer vs. autumn and winter) on body weight and wool characteristics were studied. 50 female Baluchi sheep 1-3 ages from Abbas Abad station in East-North of Iran were selected and divided into t'vvo groups for two years. The right midside wool samples were collected twice in spring and autumn. The traits of body weight at birth, 1, 2 and 3 years age, fleece weight, staple length at shoulder, flank and rump regions, fiber Hauteur and Barb length, average fiber diameter and it's coefficient of varition (CVFD), tenacity and breaking force were studied. The data were analyzed by repeated measurement and general linear model (GLM) using SAS software package. The effect of birth type was computed as a covariate. The result indicated that fleece weight was significantly (p0.00I) affect by age and shearing time (1.15:1:0.03, 2.12:1:0.07 and 1.98:1:0.061 Kg) for lamb, yearling and two years old respectively. Spring fleece weight at 3yr. old significantly more than yearling and 2yr. old (2.23:1:0.08, 1.78:1:0.04 and 1.63:1:0.07) res. Spring and autumn staple lengths of shoulder, flank and rump were significantly (p0.00 1) effected by age. Rump staple length was longer (p0.000I) than other parts. Hauteur and Barbe fiber length were significantly (p0.000 1) affected by shearing times and ages. The autumn wool fiber diameter from yearling ewes was 32.2:1:0.3 versus 26.8:1:0.3 and 26.8
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