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The influence of previous feed (energy) or protein restriction on daily gain composition was investigated on 78 pigs. Group E pigs from 15 to 25 kg (restriction period) consumed 40% less feed (energy) daily, group P pigs, 40% less protein as compared with control pigs, group C. From 25 to 70 kg (realimentation period) all pigs were fed diets with a low (12.4 MJ ME) or high (13.2 MJ ME) energy content on a restrictedfeeding level ox ad libitum. Animals were slaughtered at 15 kg (n=4), 25 kg (n=12) and 70 kg (n=66) and their bodies were analysed for protein, fat, ash and water content. During restriction the P and E animals grew more slowly than the C pigs (370 and 247 vs 513 g/day, PO.01) and deposited less protein daily in their bodies (39 and 37 vs 72 g, PO.01) . Daily fat deposition differed between groups of pigs (PO.01) and was the lowest in the E (13 g) and the highest in the P pigs (95 g). During realimentation (25-70 kg) the P pigs deposited more protein daily (PO.01) compared with the C and E pigs (140 vs 132 and 132 g). Daily fat deposition was the lowest (PO.05) in the P and the highest in the E pigs. The P and E pigs deposited more protein daily in the entrails than the C animals (23 and 22 vs 20 g, respectively; PO.05) . The P pigs tended to deposit more, but the E pigs less protein in the carcass daily as compared with the C pigs (117,110 and 112 g, respectively; PO.07) . It seems that a different compensatory response of pigs previously underfed for protein or feed intake results from the different physiological state of their bodies at the end of restriction. A compensatory response was directed to that part of the body (body component) whose growth had been reduced the most during previous restriction.

The influence of previous protein or energy restriction of young pigs on their daily gain composition