Effect of storing duration in summer on the lipid properties in the diet (including 3% perilla seeds) of finishing pigs

We studied the effects of storing duration in summer on the properties of lipids in the diet for finishing pigs which included 3% perilla seeds. In the storing experiment, the control diet and experimental diet which included 3% perilla seeds were stored in a storehouse, with an average temperature of 25.3degC and an average humidity, 77.9% for 4 weeks in summer (July to September 2008). The peroxide value did not change during the experimental period, remaining at almost the same level. Acid value in the experimental diet showed lower values than those of the control diet during the entire experimental period. Moreover, acid values in both diets rose equal during storing. For fatty acid composition each week, there was no difference between these diets. In the feeding experiment, no significant differences were observed between the custom diet group (no storing diet for finishing pigs (including 3% perilla seeds)) and storing custom diet for the 1-week group, 2-week group and 3-week group for daily gain and feed efficiency, final weight, carcass weight, dressed carcass percentage, backfat thickness and fatty acid composition. These results indicate that it is possible for diet feed (including 3% perilla seeds) to be stored 3-4 weeks in summer.