Skin Quality and Physical Properties of Leather Based on Sex, Age and Body Parts of Goats Reared on Sub-Humid Hill Country
محورهای موضوعی : Camel
م. صالحی
1
(Department of Animal by Product, Animal Science Research Institute, Karaj, Iran)
ا. لواف
2
(Department of Animal Science, Karaj Branch, Islamic Azad University, Karaj, Iran)
ط. فرهوش
3
(Department of Animal Science, Shabestar Branch, Islamic Azad University, Shabestar, Iran)
کلید واژه: age, sex, Leather, Physical characteristics, Skin,
چکیده مقاله :
To investigate the characteristics of skin and leather of hairy goats according to their sex and age, 120 goat skins were selected from the western part of Iran. Results indicated that sex and age had significant effects on weight and area of skin and leather. Moreover, sex and age had significant effects on thickness in different parts of skin except the belly. In this regard, the overall mean weight of skin and leather were 1074.8 ± 27.9g and 427.2 ± 25.9 g, respectively. High coefficients of variation (28.3 and 66.3 percent, respectively) were found in these traits. The ranges of skin and leather area were from 30 to 80 dm2 and 38 to 115 dm2, respectively. Parts of the body (shoulder, hip and ribs) and sample position (parallel and perpendicular) significantly affected the mean of breakage force, tensile strength and elongation of tested pieces. A wide range of breakage force, tensile strength and elongation 4.5-66.0 kgf, 63.4-558.3 kgf cm-2 and 22.0-141.3% were found in the goat leathers, respectively. The results of this study indicated that there are differences between quantitative and qualitative traits of skin and leather of different goats. To achieve better quality goat products, attention should be paid to differences in skin quality of different sexes and ages of goats.
برای بررسی ویژگی‎های پوست و چرم بزهای موئی با توجه به سن و جنس آنها، تعداد 120 پوست بز از بخش غربی ایران انتخاب شدند. نتایج نشان دهنده معنی‌دار بودن سن و جنس بر وزن و مساحت پوست و چرم بود. علاوه بر این، سن و جنس، اثرات معنی‎داری برروی ضخامت چرم و پوست در نواحی مختلف بدن به جز شکم داشتند. متوسط وزن کل پوست و چرم به ترتیب 9/27 ± 8/1074 و 9/25 ± 2/427 گرم بود. همچنین این صفات ضرایب تغییرات بالائی را نشان دادند (به ترتیب 03/28 و 3/66) که مقدار آن برای نواحی پوست از 30 تا 80 dm2 و برای نواحی چرم از 38 تا 115 dm2 متغیر بود. قسمت‎های مختلف بدن (شانه، لگن و دنده‏ها) و موقعیت نمونه (موازی و عمود) به طور معنی‎داری تحت تاثیر متوسط نیروی شکستگی، استحکام کششی و ازدیاد طول قطعات تست شده قرار داشتند. طیف گسترده‏ای از مقادیر نیروی شکستگی، استحکام کششی و ازدیاد طول در چرم بزها مشاهده شد (به ترتیب 5/4-0/66 kgf، 4/63-3/558 kgf cm-2 و 0/22-3/141 درصد). نتایج این تحقیق نشان داد که بین صفات کمی و کیفی پوست و چرم بزهای مختلف، اختلاف وجود داشته و برای بدست آوردن یک ویژگی بهتر برای کیفیت محصولات بز، بایستی اختلافات ناشی از سن و جنس دام‎ها را مد نظر قرار داد.
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