Data/hora: 11/06/2024 05:38:34

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 07/04/2005
Data da última atualização: | 07/04/2005
Autoria: | LÓPEZ-BOTE, C. J.; DAZA, A.; SOARES, M.; BERGES, E.
Título: | Dose-response effect of dietary vitamin E concentration on meat quality characteristics in light-weight lambs.
Ano de publicação: | 2001
Fonte/Imprenta: | Animal Science, v. 73, pt 3, p. 451-457, 2001
Idioma: | Inglês
Conteúdo: | The research was carried out to evaluate lhe effect of different dietary a-tocopheryl acetate (DTA) concentrations in light-weight lambs on muscle a-tocopherol accumulation and on quality characteristics of stored meats. Thirty-two Manchego lambs were randomly distributed to four groups and given diets containing four levels of DTA (20, 270, 520 and 1020 mg/kg diet) for 6 weeks. Lambs were slaughtered at live weights ranging from 23.5 to 26.4 kg. A linear (P < 0.001) and quadratic (P < 0.001) effect of dietary supplementation leveI was observed on muscular a-tocopherol concentration, which fitted the following equation: mg muscle a-tocopherol per kg muscle = 1.78(s.e. 0.18) + 7-08 (s.e.0.89)(1 - e0.0012DTA (P < 0.001, R2 = 0.99). There was a linear effect (P < 0.001) of muscle vitamin E concentration on thiobarbituric acid reactive"substance on day 0 of storage, but a linear plus quadratic effect (P < 0.001) on days 3, 6 and 9. Broken line analysis of data at day 9 of storage indicated a target muscle a- tocopherol concentration of 54 mg/kg. Evolution of surface redness of lamb chops also showed a linear and quadratic effect of dietary treatment on days 3 and 6 of storage, but only a linear effect on day 9. Broken line analysis of data at 3 and 6 days indicated a target a-tocopherol concentration in the range 5.3 to 5.6 mg/kg muscle for optimum red colour stability. Surface luminosity showed no effect of dietary treatment at days 0, 3 and 6 of storage but a linear (P < 0.01) plus quadratic (P < 0.05) effect on day 9 of storage. Broken line analysis at this point indicated a target muscle a-tocopherol concentration of 3.2 mg/kg. It is concluded that lhe effectiveness of dietary a-tocopheryl acetate supplementation depends on the meat quality attribute assessed. A significant positive effect for lipid oxidation can be reached even at the lower supplementation leveI utilized in this experiment (270 mg/kg diet). However, considering the protecting effect at different storage times and particularly the effect on meat surface redness, the optimum leveI would be in the range 5.3 to 5.6 mg/kg muscle, which correspond to a dietary inclusion of 550 to 625 mg a-tocopheryl acetate/kg diet.
Palavras-Chave: | Peroxidade.
Thesagro: | Carne; Cordeiro; Lipídio; Nutrição Animal; Ovino; Qualidade; Vitamina E.
Categoria do assunto: | --
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (17624-1) - ADC - AP - -- -  -  - v.73,p.451 - DIS