Cambios en el perfil lipídico de la grasa subcutánea segúnel tipo de pienso en cerdos ibéricos próximosa mantenimiento

Abstract

The objective of this research was to study the effect of the feeding level (close to maintenance needs)depending on the type of feed (with different fat levels: 7 % vs. 4 %) and the time, on the subcutane-ous fat profile of Iberian pigs. The outer layer presented greater proportions of C18:0 and C20:0, andthe inner greater C16:0 and C22:5n-3 with the carbohydrate-based diet. On the other hand, with thesupply of high fat feed, greater proportions of C18:2n-6 and C20:3n-9 were obtained in both layers. Regarding the effect of time there was a decrease in C16:1n-7, C18:1n-7 and C18:4n-3 and an increase inC18:0 in the external layer in pigs close to maintenance level. In the inner layer, the proportion of C18:1n-7, C18:3n-3, C20:5n-3 and C22:5n-3 decreased but there were not changes in the sum of the main fattyacid groups. In conclusion, a maintenance waiting time of three weeks implies a reduction in the pro-portions of n-7 monounsaturated in subcutaneous fat of external layer and individual changes in n-3polyunsaturated fatty acids in both layers due to its metabolic utilization; however these changes werenot observed in the total of n-3 fatty acids. No changes were observed in both layer due to the inter-action of both factors (type of diet and time of feeding close to maintenance) which represents an ad-vance in for the management by the rancher in the sector