Over 89 days, 10 lambs (S) were fed concentrates and hay in stall, while 9 lambs (P) grazed at pasture. Twogroups of 9 animals grazed at pasture until switching to a concentrate-based diet for 14 or 37 days before slaughter (P-S14 and P-S37). The fat content of longissimus dorsi muscle (LM) increased with increasing duration of concentrate feeding (P = 0.05). As a consequence, the concentration of polyunsaturated fatty acids(PUFA) and of the highly peroxidisable (HP) PUFA in the polar lipids was similar between treatments. Lipidoxidation in fresh LM over 8 days of storage was affected by the diet (P b 0.0005) with the P-S37 and P treatmentsproducing, respectively, the highest and the lowest TBARS values. The P treatment reduced TBARS in cooked minced LM over 2 days of storage and no difference was found between the P-S14, P-S37 and S treatments.Colour stability of fresh LM was not noticeably affected by the dietary treatment.
The effect of the change from a herbage- to a concentrate-based diet on the oxidative stability of raw and cooked lamb meat
Luciano G
Primo
;Biondi L;Lanza MPenultimo
;Priolo AUltimo
2013-01-01
Abstract
Over 89 days, 10 lambs (S) were fed concentrates and hay in stall, while 9 lambs (P) grazed at pasture. Twogroups of 9 animals grazed at pasture until switching to a concentrate-based diet for 14 or 37 days before slaughter (P-S14 and P-S37). The fat content of longissimus dorsi muscle (LM) increased with increasing duration of concentrate feeding (P = 0.05). As a consequence, the concentration of polyunsaturated fatty acids(PUFA) and of the highly peroxidisable (HP) PUFA in the polar lipids was similar between treatments. Lipidoxidation in fresh LM over 8 days of storage was affected by the diet (P b 0.0005) with the P-S37 and P treatmentsproducing, respectively, the highest and the lowest TBARS values. The P treatment reduced TBARS in cooked minced LM over 2 days of storage and no difference was found between the P-S14, P-S37 and S treatments.Colour stability of fresh LM was not noticeably affected by the dietary treatment.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.