Óleo de linhaça na terminação de novilhos Nelore: qualidade da carne

• Ano de defesa: 2014
• Autor(a) principal: Pivaro, Thiago Martins [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Bovino de corte - Nutrição; Nelore (Zebu); Colesterol; Lipidios; Acidos graxos; Carne - Qualidade; Meat
• Link de acesso: http://hdl.handle.net/11449/113993

The objective was to evaluate the physics and chemical characteristics, enzymatic activity, fatty acids ratio and quality indexes of the Longissimus and the Triceps brachii of 35 Nellore steers fed protected linseed oil for 35 , 70 or 105 days before slaughter, in natura oil or without oil addition for 105 days. The roughage was corn silage (40% DM) and diets with added oil were isocaloric (76.1% TDN and 6.1% EE). The animals were confined in individual pens and slaughtered with 522.71 ± 27.99 kg of body weight. The diet addition of linseed oil resulted in increased (P<0.10) levels of saturated and hypercholesterolemic fatty acids, thrombogenicity and atherogenicity indices, and lower Δ9 desaturases enzymes activity on meat compared to the treatment with no oil; on the other hand, increased the concentration of conjugated linoleic acid and ω3 fatty acids, and the ratio ω6:ω3 reduced, but in natura linseed oil was more efficient than the protected form. Increasing the duration time of protected oil supplementation decreased (P<0.10) linearly the cholesterol content and the fatty acids ratio ω6:ω3, and increased conjugated linoleic acid and ω3. The comparison between muscles showed that the Longissimus had higher shear force, lower percentage of cooking losses, total collagen and lipid oxidation compared to Triceps brachii. Higher concentrations of the acids C14:0, C14:1, C16:0, C18:2 cis 9 trans 11, C18:3 ω6 and C20:0 were found on Longissimus, however, the Triceps brachii accumulated highest levels of C17:1, C18:2 ω6,C18:3 ω3, C20:1 ω9, C20:3 ω6, C20:4 ω6, C20:5 ω3 , C22:4 ω6, C22:6 ω3 and C24:1 ω9 acids, showing greater correlation between unsaturated:saturated and polyunsaturated:saturated fatty acid, and we also observed increased elongase activity on shoulder clod than sirloin. Beef incorporates the beneficial aspects for human health of linseed oil fed to fattening steers, even some quality indices were ...