THE INFLUENCE OF THE FEEDING INTENSITY ON THE POLYENE FATTY-ACID CONCENTRATION IN THE BODY-FAT OF HEAVY PIGS (GREATER-THAN-160-KG-LW)

In one feeding experiment with 4x12 DuxDL-barrows the animals were fed on different nutrient level and the influence on fattening and carcas s performance as well as the fat quality of the fat compartments was d etermined. The positive control group I was fed a diet with 13 MJ ME/k g continuously, whereas the energy content of the extensivenegative co ntrol group IV was about 11.5 MJ ME/kg. In group II the conversion to the high energy level occurred at the beginning of the middle period ( up to 54 kg LW), in group III at the beginning of the final period (up to 109 kg). Contrary to group I the pigs of group II could compensate the growth retardation of the first period till the end of fattening; the pigs of group III were considerably left behind. All three groups had the same dressing percentage and obesity, whereas the continuousl y extensive fed group IV showed less results in these parameters. Cons idering the same intake of linoleic acid in all four groups, in the an alyzed fat compartments abdominal fat and back fat the contents increa sed in spite of the less obesity of the animals of group IV. The conce ntrations of linolenic acid raised up significantly, but not in the sa me proportion to the contents of the extensive feed mixtures. This res ult could be explained by a decreased praecaecal fat digestion because of the adsorptive effect of high fibre contents in the ration.