The aim of this work was to study the effects of grass utilization in the diets on performance of finishing Bísaro pigs. A total of 22 pigs (16 castrated males and 6 females) was housed outdoors and fed ad libitum (37-85 kg live weight) on a growing diet and then transferred to an indoor system (with free access to an outdoor area) for 49days, according to 3 different treatments: 100% concentrate (C), 75% concentrate + ad libitum grass (CE75), 50% concentrate + ad libitum grass (CE50). The grass was supplied and its intake registered on a daily basis. Every 14 days, the pigs were weighted and their backfat (P2 in vivo) measured. After slaughter (average weight of 107 kg LW),yield and 1/2 left carcass characteristics were controlled. During the outdoor growing phase, the ADG was 513 g/day. During the indoor finishing phase, the increase was proportional to the reduction of concentrate in the diet. The ADG(g) and the fat deposition (P2 cm) were significantly different (P<0.05) in the 3 treatments (ADG: C=641; CE75=467;CE50=356 and: C=11.4; CE75=+9.5; CE50=+6.2). The empty body weight (kg) was also proportional to the intake of concentrate (C=116.2; CE75=107.7; CE50=102.2). Comparatively to the weight of the body parts, pigs that had higher intake of grass and lower of concentrate showed a higher % of shoulder (P<0.05; C=20.4; CE75=21.7;CE50=22.2) and the pH 45min of CE carcasses was significantly higher (P<0.05). As a conclusion, concentrate substitution for grass showed a slower growing rate, thinner carcasses and a high technological quality.
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