title: Effect of dietary starch level and its rumen degradability on lamb meat fatty acid composition.
abstract: Forty lambs were fed one of four diets supplemented with a linseed and sunflower oil blend but differing in starch level (mid, ≈35 vs. high, ≈50%) and starch rumen degradability (mid, ≈70 vs. high, ≈80%). The effects of diet on growth, carcass traits and meat fatty acid (FA) composition, with emphasis on biohydrogenation intermediates were evaluated. Lambs stayed on trial for 5weeks until slaughter. Treatment had no effect on animal performance and carcass traits. High-degradability diets decreased (P=0.04) meat shear force compared with mid-degradability diets. Lipid content of meat was unaffected by the diet. Mid-starch diets increased (P<0.05) the saturated FA and cis-MUFA but decreased (P<0.05) the trans-MUFA, particularly the t10-18:1, when compared with high-starch diets. The t11-18:1 (0.7% of total FA) and c9,t11-18:2 (<0.3%) remained low and the 18:3n-3 remained high (1.74%) and unaffected by diet.
authors.affiliation: Faculdade de Medicina Veterinária, ULisboa, 1300-477 Lisboa, Portugal; Escola Superior Agrária de Coimbra, Instituto Politécnico de Coimbra, 3045-601 Coimbra, Portugal.
authors.forename: Maria A
authors.initials: MA
authors.lastname: Oliveira
authors.affiliation: Faculdade de Medicina Veterinária, ULisboa, 1300-477 Lisboa, Portugal; CIISA, Centro de Investigação Interdisciplinar em Sanidade Animal, Avenida da Universidade Técnica, 1300-477 Lisboa, Portugal.
authors.forename: Susana P
authors.initials: SP
authors.lastname: Alves
authors.affiliation: CIISA, Centro de Investigação Interdisciplinar em Sanidade Animal, Avenida da Universidade Técnica, 1300-477 Lisboa, Portugal; Unidade Estratégica de Investigação e Serviços em Produção Animal e Saúde (UEISPSA-INIAV), 2005-048 Vale de Santarém, Portugal.
authors.forename: José
authors.initials: J
authors.lastname: Santos-Silva
authors.affiliation: Faculdade de Medicina Veterinária, ULisboa, 1300-477 Lisboa, Portugal; CIISA, Centro de Investigação Interdisciplinar em Sanidade Animal, Avenida da Universidade Técnica, 1300-477 Lisboa, Portugal. Electronic address: rjbbessa@fmv.ulisboa.pt.
authors.forename: Rui J B
authors.initials: RJB
authors.lastname: Bessa
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D004032:Diet / Q000662:veterinary*; D005227:Fatty Acids / Q000032:analysis*; D005504:Food Analysis; D063427:Food Quality; D008043:Linseed Oil / Q000008:administration & dosage; D010938:Plant Oils / Q000008:administration & dosage; D000069466:Red Meat / Q000032:analysis*; D012417:Rumen / Q000378:metabolism*; D034561:Sheep, Domestic; D013213:Starch / Q000008:administration & dosage*; D000074242:Sunflower Oil
chemical_list: D005227:Fatty Acids; D010938:Plant Oils; D000074242:Sunflower Oil; D008043:Linseed Oil; D013213:Starch
keywords: Biohydrogenation intermediates; Corn; Fatty acids; Lamb meat; Starch; Wheat