2011 Volume 48 Issue 3 Pages 134-142
We studied the validity of roasting perilla seed for storage of feed containing perilla seed under high temperature and high humidity. In the experiment, feed containing 3% non-roasted perilla seed (NPS diet) and that containing 3% roasted perilla seed (RPS diet) were used for storage at 30.0°C and 80% relative humidity for 5 weeks. In both of the NPS and RPS diets, acid values rose during storage, and there were significant differences (P<0.05) between the non-stored and 2-week or 5-week-stored feed. The RPS diet showed lower acid values than the NPS diet during the entire experimental period. The peroxide values in both the NPS and RPS diets did not change during the experimental period, remaining at almost the same level. For fatty acid composition of the NPS diet, C18 : 3 content in the lipid of the 5-week-stored feed was significantly lower than that of the non-stored feed (P<0.05), and the n-6/n-3 ratio in the 5-week-stored feed was significantly higher than that in the non-stored feed. In the RPS diets, C18 : 2 content in the 5-week-stored feed was significantly higher than that in the 2-week-stored feed, and there were no significant differences for the other fatty acids analyzed. In the feeding experiment, twelve crossbred pigs (LW×D) were assigned to one of three dietary treatments : NPS diet non-stored (NPS0), NPS diet 5-week-stored (NPS5), and RPS diet 5-week-stored (RPS5). Average daily weight gain was significantly higher in RPS5 than that in NPS0 (P<0.05). For the fatty acid composition of adipose tissues, C14 : 0 and C16 : 0 contents in the perirenal fat were significantly lower in RPS5 than in NPS5 (P<0.05), and C18 : 3 contents in perirenal fat and back fat were significantly lower in NPS5 than in NPS0 (p<0.05), and the n-6/n-3 ratio was significantly higher in NPS5 than in NPS0 (P<0.05). For fatty acid composition of intramuscular fat, the C18 : 3 was significantly lower in NPS5 than in NPS0 (P<0.05), but there was no significant difference in the n-6/n-3 ratio between in NPS5 and in NPS0. In the comparison between RPS5 and NPS0, there was no significant difference in the perirenal fat, back fat and intramuscular fat. These results indicate that the use of roasted perilla seed is effective in preventing the oxidation of lipids in feed containing perilla seed during the storage.
