shows the FCC variations during the experimentalperiod. FCC significantly (P 0.001) increased with the increasingof age and live weight of pigs: FCC at the last sampling date showsalmost double value (108.10 ng/g) if compared to the first samplingdate (56.74 ng/g). Furthermore, at the end of the experimentalperiod, stocking density shows a significant effect analyzing FCCs ateach sampling date. At the second-last sampling date, FCC levelsdetected in pigs housed in high stocking density (HD-BP: 110.03 ng/g and HD-EP: 112.57 ng/g) were higher (P 0.01) if compared topigs housed in low stocking density (LD-BP: 90.40 ng/g and LD-EP:85.45 ng/g). Similarly, higher (P 0.05) FCCs were detected at thelast sampling date in pigs housed in high-density pens (HD-BP:123.59 ng/g and HD-EP: 111.15 ng/g) than in low-density pens(LD-BP: 102.06 ng/g and LD-EP: 94.76 ng/g).