Investigation of the Effects of Age and Sex on Fiber Characteristics of Iranian Indigenous Goats
محورهای موضوعی : Camel
1 - Department of Animal Science, Karaj Branch, Islamic Azad University, Karaj, Iran
کلید واژه: age, sex, Goat, fiber quality, fleece characteristics,
چکیده مقاله :
This study was conducted to investigate the effects of age and sex on the fleece characteristics of 40 Iranian indigenous Khorasan goats. Goats were divided into two different sex and age (kids and adults) groups. Fiber characteristics under study were: fleece weight, fiber length, lock length, fiber diameter, coefficient of fiber diameter, breaking load, resistance, elongation, hair percentage and down fibers percentage. The results showed that sex and age had a significant effect on fleece weight and fiber diameter. The average fleece weight was 214.6 ± 0.5 g in males and 186.9 ± 4.15 g in females while 196.2 ± 15.8 g in kids and 205.5 ± 15.8 g in adults. The average fiber diameter was 88.4 ± 4.5 microns in males and 73.5 ± 3.9 microns in females while 73.4 ± 3.9 microns in kids and 88.5 ± 4.5 microns in adults. The resistances of hair in kids (8±0.9 grf/t) were lower than in adult goats (10.5±0.7 grf/t). Fleeces had down fibers (1-30% with the average amount of 11.1%±2.2), average fiber diameter of 16.4 ± 0.6 micron and coefficient of variation of fiber by 18.3 ± 1.1%. The correlation between fiber length and lock length, resistance and lock length were 0.9 and 0.6, respectively which was considered highly positive. In the overall view, according to the approximately low fleece weight, low fiber length and including of down fibers in the fleece of indigenous Khorasan goats, they are categorized in hair goats with medium quality fleeces.
این تحقیق به‌منظور بررسی اثر سن و جنس بر ویژگیهای الیاف بز بومی خراسان انجام گرفت. بزهای مورد مطالعه در این تحقیق متعلق به دو گروه سنی متفاوت (بزغاله و بز بالغ) و از هر دو جنس بودند. ویژگیهای الیاف عبارت بودند از وزن بیده، طول الیاف، طول استاپل، قطر الیاف، ضریب تغییرات قطر الیاف، ضریب شکستگی، مقاومت، قابلیت ارتجاعی، درصد الیاف مو و درصد االیاف ظریف. نتایج نشان داد که جنس و سن اثر معنیداری بر وزن بیده و قطر الیاف داشتند. متوسط وزن بیده و قطر الیاف در بزهای نر و ماده به‌ترتیب 5/0 ± 6/214 گرم و5/4 ± 4/88 میکرون و15/4 ± 9/186گرم و 9/3 ± 5/73 میکرون و در بزغالهها و بزهای بالغ به‌ترتیب 8/15 ± 2/196 گرم و 9/3 ± 4/73 میکرون و 8/15 ± 5/205 گرم و 5/4 ± 5/88 میکرون به‌دست آمد. مقدار مقاومت الیاف مو در بزغالهها کمتر از بزهای بالغ بود (9/0±0/8 به 7/0±5/10 گرم نیرو بر تکست). در بیدههای مورد بررسی، درصد الیاف ظریف (1 الی 30 درصد با حد متوسط 2/2±1/11 درصد)، متوسط قطر الیاف 6/0 ± 4/16 میکرون و ضریب تغییرات قطر 1/1 ± 3/18 درصد بود. همبستگی بین طول الیاف و طول استاپل و مقاومت و طول استاپل به‌ترتیب 9/0 و 6/0 بود. در بیان کلی، با توجه به وزن نسبتأ پایین بیده، الیاف کوتاه و وجود الیاف ظریف در داخل بیده، میتوان بزهای بومی خراسان را در گروه بزهای مویی با بیده با کیفیت متوسط طبقهبندی نمود.
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