FAT QUALITY IN HEAVY PIGS DEPENDENT ON TH E PROVISION PERIOD OF EQUALQUANTITIES OF RAPESEED OIL

The presented results should give a contribution to the question, if f eeding of equal volumes of rape-seed oil during different periods of f attening could influence the polyen acid content in the fat compartime nts of the carcass. In comparison to the control group with an additiv e of 1 % rape-seed oil for dust absorption in non-pelleted mixed prove nder 5,5 kg rape-seed oil were added to the isocaloric, isonitrogen, a nd feed additive equivalent fattening feed during the initial, middle and final fattening period. In the dorsale part of backfat no influenc e of temporal different rape-seed oil supplementation on the linoleic acid content in fatty acid sample was detected. In the ventrale part o f backfat and in the abdominal fat the feeding of rape-seed oil in the final period was lifting the concentration of linoleic acid significa ntly. There could be found a temporal different dependence of the lino lenic acid content. All experimental groups with additional rape-seed oil had a significant higher polyen acid content in the fatty acid sam ple of all examined fat compartiments than the control group. In case of a high but optimal fat insertion the supplementation of rape-seed o il produces an acceptable processing and sensorical content of polyen acid in the backfat.