Fatty acid composition of adipose depots of suckling lambs raised under different production systems |
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| Authors: | Velasco S Cañeque V Pérez C Lauzurica S Díaz M T Huidobro F Manzanares C González J |
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| Affiliation: | 1. Institute of Chemistry, Federal University of Rio de Janeiro, Avenida Athos da Silveira Ramos, 149 – bloco A, CEP 21.941-909, Cidade Universitária, Rio de Janeiro, RJ, Brazil;2. Embrapa Pecuária Sul, P.O. Box 242, BR 153 km 633, CEP 96.401-970, Bagé, RS, Brazil;3. Post-Graduation Programme in Management (UFRGS/PPGA), Federal University of Rio Grande do Sul, Rua Washington Luiz, 855, 3° andar, CEP, 90010-460 Porto Alegre, RS, Brazil;4. Sensometrics & Consumer Science, Instituto Polo Tecnológico de Pando, Facultad de Química, Universidad de la República, By Pass de Rutas 8 y 101 s/n. Pando, Canelones, Uruguay;5. Embrapa Agroindústria de Alimentos, Avenida das Américas, 29501, CEP 23.020-470, Rio de Janeiro, RJ, Brazil;1. Agriculture Research and Development, DEDJTR, Melbourne, Victoria 3001, Australia;2. NSW Department of Primary Industries, Centre for Red Meat and Sheep Development, PO Box 129, Cowra, NSW 2794, Australia;1. Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, building 184, Parkville, VIC 3010, Australia;2. Department of Primary Industries and Regional Development, 3 Baron-Hay Ct, South Perth, WA, 6151, Australia;3. The Statistical Consulting Centre, The University of Melbourne, 139 Barry St, Parkville, VIC, 3010, Australia;4. Faculty of Agriculture and Life Sciences, Lincoln University, PO Box 85084, Lincoln 7647, Canterbury, New Zealand;1. Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC 3010, Australia;2. Formerly Department of Primary Industries and Regional Development, The Government of Western Australia, 3 Baron-Hay Ct, South Perth, WA 6151, Australia;3. Statistical Consulting Centre, The University of Melbourne, Parkville, VIC 3010, Australia;4. Faculty of Agriculture and Life Sciences, PO Box 85084, Lincoln University, Lincoln, 7647 Canterbury, New Zealand;1. Faculdade de Medicina Veterinária, ULisboa, 1300-477 Lisboa, Portugal;2. Escola Superior Agrária de Coimbra, Instituto Politécnico de Coimbra, 3045-601 Coimbra, Portugal;3. CIISA, Centro de Investigação Interdisciplinar em Sanidade Animal, Avenida da Universidade Técnica, 1300-477 Lisboa, Portugal;4. Unidade Estratégica de Investigação e Serviços em Produção Animal e Saúde (UEISPSA-INIAV), 2005-048 Vale de Santarém, Portugal |
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| Abstract: | Forty-nine male Talaverana-breed suckling lambs slaughtered at 14 kg live weight were used to study the fatty acid composition of adipose depots of lambs raised under different management systems (pasture or drylot) and diets (maternal milk with or without a concentrate supplement). Drylot lambs displayed a higher fatness score, in addition to greater dorsal fat thickness; these parameters corresponded with a greater percentage of total fat at dissection. Addition of concentrate to the diet did not modify carcass fatness. Drylot lambs presented higher proportions of oleic acid (C18:1) and monounsaturated fatty acids (MUFA) and lower linolenic acid (C18:3) values in subcutaneous and intramuscular fat (muscle longissimus thoracis). The subcutaneous fat of these lambs thus displayed a higher n-6/n-3 PUFA ratio (C18:2/C18:3) than that of pasture-raised ones. Concentrate in the diet of both pasture and drylot lambs resulted in higher linoleic fatty acid (C18:2) and PUFA values and a greater PUFA/SFA ratio in intramuscular fat than the corresponding values of lambs which consumed maternal milk alone. Loin displayed a higher percentage of subcutaneous and intramuscular chemical fat than leg. Compared with intramuscular leg fat (muscle quadriceps femoris), intramuscular loin fat (muscle longissimus thoracis) had lower oleic acid (C18:1) and MUFA values, higher PUFA values and a higher PUFA/SFA ratio, due to greater linolenic acid (C18:3) levels. |
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