Priolo A, Cornu A, Prache S, Krogmann M, Kondjoyan N, Micol D, Berdagué J-L
Unité de Recherches sur les Herbivores, INRA Clermont-Ferrand/Theix 63122 St. Genès Champanelle, France.
Meat Sci. 2004 Feb;66(2):475-81. doi: 10.1016/S0309-1740(03)00136-0.
Volatile compounds were analysed in subcutaneous fat from lambs raised and finished on grass (GG); raised and finished on concentrates (SS); raised on grass and finished on concentrates for a long (GS1) or a short (GS2) period. Whereas 3-methylindole (skatole), a compound that has been described as a good discriminator of grass feeding, was unaffected by the diet (P>0.05), 2,3-octanedione was lower (P<0.01) in the fat from animals that spent a period in stall with a concentrate diet than in those finished on grass. Among the 20 monoterpenes detected, only p-cymene was affected by the treatment, being higher (P<0.05) in the fat from animals raised and finished on grass (GG) than in the other treatments. Eight among the 13 detected sesquiterpenes were affected by the diet treatment. In particular β-caryophyllene, not detected in the fat from animals raised and finished on concentrates (SS group), was at basal levels in the animals raised on pasture and finished for different durations on concentrates (GS1 and GS2 treatments) and was present at high levels in the animals raised and finished on grass (P<0.0005). From a factorial discriminant analysis, four of the 33 terpenes detected discriminated perfectly those animals raised and finished on pasture (GG) from all the other groups (SS, GS1, GS2).
对在草地上饲养育肥的羔羊（GG）、在精饲料上饲养育肥的羔羊（SS）、在草地上饲养并在精饲料上长期（GS1）或短期（GS2）育肥的羔羊皮下脂肪中的挥发性化合物进行了分析。虽然3-甲基吲哚（粪臭素）这种被描述为草饲良好判别指标的化合物不受日粮影响（P>0.05），但在舍饲并采食精饲料一段时间的动物脂肪中，2,3-辛二酮含量较低（P<0.01），低于在草地上育肥的动物。在所检测的20种单萜中，只有对伞花烃受处理影响，在草地上饲养育肥的动物（GG）脂肪中的含量高于其他处理组（P<0.05）。所检测的13种倍半萜中有8种受日粮处理影响。特别是，在精饲料上饲养育肥的动物（SS组）脂肪中未检测到的β-石竹烯，在放牧饲养并在精饲料上不同时长育肥的动物（GS1和GS2处理）中处于基础水平，而在草地上饲养育肥的动物中含量较高（P<0.0005）。通过因子判别分析，所检测的33种萜类中有4种能够完美地区分在草地上饲养育肥的动物（GG）与所有其他组（SS、GS1、GS2）。
