Effect of Slaughter Weight, Carcass Weight and Sex on the Carcass Fatty Acid Composition of Boutsiko Breed Lambs
محورهای موضوعی : CamelV. Alexandridis 1 , B. Skapetas 2 , D. Kantas 3 , P. Goulas 4 , A. Eleptheriadou 5
1 - Department of Animal Production, Technological Educational Institute of Larisa,41110, Larisa, Greece
2 - Department of Animal Production, Technological Educational Institute of Thessaloniki, 57400, Thessaloniki, Greece
3 - Department of Animal Production, Technological Educational Institute of Larisa,41110, Larisa, Greece
4 - Department of Animal Production, Technological Educational Institute of Larisa,41110, Larisa, Greece
5 - Department of Animal Production, Technological Educational Institute of Thessaloniki, 57400, Thessaloniki, Greece
کلید واژه: age, Path analysis, sex, lambs, Fatty Acids, slaughter weight,
چکیده مقاله :
The aim of the present study was to assess the effect of slaughter and carcass weight, age at slaughter and sex on the fatty acid profile of the Greek Boutsiko sheep breed. Twenty lambs (ten females and ten males) were examined. The lambs were slaughtered at the age of 48 days. Carcasses were chopped in nine specific cuts and a random sample of 100 g was taken from each cut, with a total of 180 samples. From every ground sample a quantity of 2 g was taken for lipid extraction and preparation of fatty acid methyl esters. To predict the relationship of age, sex and weight on saturated fatty acids (SFA), monounsaturatedfatty acids (MUFA) and polyunsaturated fatty acids (PUFA) a path analysis was adopted which tests all regression equations simultaneously. Age at slaughter was assumed to have an indirect impact via slaughter weight and carcass weight. Findings suggest that the model which uses slaughter weight instead of carcass weight, predicts better the fatty acid composition of Boutsiko breed lambs. As to the nutritional quality of the meat, the PUFA / SFA ratio was found relatively low while the ratio ω-6/ω-3 PUFA, was acceptable for human healthy nutrition. The best fatty acid composition was found for leg, shoulder and racks. It was concluded that producers may increase the age of slaughter, but that should be combined with their engagement in low cost diet modifications so as to improve production and cost efficiency and at the same time retain the quality of lamb meat.
هدف از مطالعه، بررسی اثر وزن پیش از کشتار، وزن لاشه، سن کشتار و جنسیت بر پروفایل اسیدهای چرب بره‌های نژاد بوتسیکو یونان است. 20 بره (شامل 10 نر و 10 ماده) مورد آزمایش قرار گرفتند. بره‌ها در سن 48 روزگی کشتار شدند. هرکدام از لاشه‌ها به 5 بخش تقسیم شدند و یک نمونه تصادفی 100 گرمی از هر کدام از این بخش‌ها برداشت گردید (مجموعاً 180 نمونه). از هر کدام از این نمونه‌ها یک نمونه 2 گرمی جهت استخراج چربی و تخلیص آنزیم متیل استراز اسید چرب، اخذ گردید. جهت پیش‌بینی رابطه سن، جنسیت و وزن با اسیدهای چرب اشباع (SFA)، اسیدهای چرب غیر اشباع یگانه (MUFA) و اسیدهای چرب غیراشباع چندگانه (PUFA)، از یک آنالیز مسیر استفاده شده و همه معادلات تابعیت به طور همزمان مورد آزمون قرار گرفتند. فرض شده است که سن کشتار اثری غیرمستقیم از طریق وزن پیش از کشتار و وزن لاشه دارد. نتایج نشان می‌دهد که مدلی که از وزن کشتار به جای وزن لاشه استفاده می‌کند، بهتر می‌تواند ترکیب اسیدهای چرب بره‌های نژاد بوتسیکو را پیش‌بینی نماید. با در نظرّ گرفتن ارزش غذایی گوشت گوسفند برای انسان، نسبت اسیدهای چرب غیراشباع چندگانه به اسیدهای چرب اشباع نسبتاً پایین بوده ولی نسبت اسیدهای چرب غیراشباع چندگانه اُمگا 6 به اًمگا 3 برای تغذیه سالم انسان در سطح قابل قبولی بوده است. بهترین ترکیب اسیدهای چرب در دست و پا، کتف و شانه دیده شده است. می‌توان این‌گونه نتیجه‌گیری کرد که تولیدکنندگان می‌توانند سن کشتار را افزایش دهند ولی در این کار بایستی جیره به نحوی تغییر داده شود که با حداقل هزینه همراه باشد تا از این طریق تولید و بهره‌وری آن بهبود یافته و همزمان کیفیت گوشت بره‌ها نیز حفظ گردد.
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