بررسي اثر فصل بر وزن بيده، قطر، طول و ميزان مقاومت الياف پشم گوسفندان بلوچي

The seasonal effects on fleece weight, fibre diameter, fibre length and tenacity of Baluchi sheep wool

The seasonal effect (Spring and Summer versus Autumn and Winter) on wool charecterstics of Baluchi ewes were studied. The 58 female sheep 1-3 ages from Abas Abad station in East-North of Iran were selected for two years. Twice wool samples were collected from midside in Spring and Autumn. The traits studied were fleece weight at birth, 1, 2 and 3 years age – staple length at shoulder, flank and rump parts – fiber length (Hauteur and Barbe) – mean fiber diameter and coefficient of varstion – tenacity and breaking force. The data were analyzed by repeated mesearment and general liner model (GLM) using SAS software package. The result indicated that fleece weight was significantly affect by age and were 1.98±0.061, 1.15±0.03 and 2.12±0.07 Kg for lamb, yearling and two years old respectively (p<0.001). At three years old fleece shorn in spring was significantly higher (2.23±0.08kg) than that yearling (1.78±0.04 kg) and two years old (1.63±0.07 kg). Spring and Autumn staple lengths of shoulder, flank and rump parts were significantly different and were effected by age (p<0.001). Staple length at rump was longer than shoulder and flank. However the shoulder, flank and rump staple length in yearling Autumn wool (5±0.17, 5.14±0.17 and 5.7±0.17 cm), 2nd Spring wool (8.02±0.17, 6.9±0.18 and 8.76±0.18 cm), 2nd Autumn wool (4.7±0.17, 4.8±0.18 and 5.6±0.17 cm) and 3rd Spring wool were (9.8±0.18, 8.9±0.17 and 9.8±0.18 cm) res. (p<0.001). Spring and Autumn wool fiber length that measured by Hauteur and Barbe system were significantly (p<0.0001) different for ages. In yearling sheep, Autumn wool fiber diameter (32.2±0.3mu) was coarser than in spring wool at two and three age old (26.8±0.3 and 26.8±0.3 mu) res. and also from autumn wool at two years age (24.5±0.3mu). But of course coefficient of varision of mean fiber diameter in Autumn was significant (p<0.0001) from Spring wool. Tenasity force of wool in Spring at three ages (5.6±0.2gf/ tex) was significantly different from Spring and Autumn wool at second age (4.4±0.2, 2.01±0.25gf/tex) and Autumn yearling wool (3.6±0.4gf/tex). Also it was significantly different between above mentioned charectertics for breaking load 4.8±0.2 Kgf versus 3.8±0.2, 2.8±0.2 and 2.25±0.2 Kgf. Res (p<0.0001).