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Two experiments were conducted to determine the compensatory responses of pig to feed restriction during the growth period. Eighty Dalland pigs (40 boars and 40 gilts) and 60 Large White × (Large White × Landrace) barrows were used in two different experiments. They were slaughtered at 97 and 122 kg. During the restriction period, the animals were restricted by 46% and 25% of their ad libitum consumptions in experiment 1 and 2 respectively. The restriction periods lasted 28 and 35 days respectively. Considering the whole study period, in experiment 1 the average daily weight gain and food intake were lower for restricted pigs compared to those fed ad libitum: 762 vs 856 g (P < 0.03) and 2147 vs 2396 g (P < 0.08). However, the feed conversion ratio was no different: 2.83 vs 2.80 g g-1 (P < 0.81). In this experiment, the interaction treatment x sex was not significant in either test. When performance over the total period was examined in experiment 2 (moderate restriction), a stronger trend was seen towards a greater average daily weight gain in groups with restricted access to feed (853 vs 821 g in those fed ad libitum, P < 0.11). No significant differences were observed for average daily feed intake, feed conversion ratio and dorsal fat thickness (measured at the 14th rib by ultrasound) (2638 vs 2635 g, 3.09 vs 3.2 g g-1 and 16,9 vs 16.2 mm respectively).

The efficiency of manure separation by a conveyor belt under a partially slatted floor for fattening pigs was determined for two types of belts, a fíat belt with an incline of up to 6° transversely and a concave belt with an incline of up to 1° longitudinally. A 31.20% and 23.75% dry matter content of the solid fraction was obtained for the fíat and concave belt, respectively. The fíat belt was more efficient at 6° than other slope angles. The residence time of the manure on the two belt types influenced the separation efficiency from a Uve weight of 63.00 kg upwards. The quantity of residue produced with this system was _ .