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Forty-eight Swiss Large White male pigs were blocked by litter and assigned by BW to 4 experimental groups: barrows were fed a grower-finisher diet with a PUFA-MUFA index [PMI=1.3 × MUFA (g/MJ DE)+PUFA (g/MJ DE)] of 1.7 (C), IC pigs were fed a grower-finisher diet with a PMI of 1.7 (IC17), 1.5 (IC15) or 1.3 (IC13). All pigs had ad libitum access to the diets from weaning to 107 kg BW.
Compared with C, IC17 tended (P<0.10) to grow slower but consumed less feed(P<0.01), were more feed efficient (P<0.001) and their carcasses were leaner (P<0.01). The lower saturated fatty acid (SFA) concentration of the AT (P=0.12) and IMF (P<0.05) in IC17 than C was compensated by the higher PUFA level (AT: P<0.01; IMF: P<0.05). The PMI-level had no effect(P>0.05) on growth performance and carcass composition of IC17, IC15 and IC13 whereas total feed intake linearly decreased (P<0.05) with decreasing PMI level. In the AT, but not the IMF, the SFA (P<0.01) and MUFA (P<0.10) concentration linearly increased and that of PUFA linearly decreased (P<0.001) with decreasing dietary PMI level.
These results confirmed that the lower lipid deposition in carcasses of IC markedly increased the degree of unsaturation of AT and IMF lipids. To insure a comparable processing quality of the AT like that found for barrows the dietary MUFA and PUFA supply for IC must be restricted.
C Pauly ,P Spring, and G Bee. 2009. Book of Abstracts of the 60th Annual Meeting of the European Association for Animal Production, 35.
