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An experiment was carried out in 50 multiparous sows to determine the nature and importance of the tissues involved in the body composition changes occurring between mating and weaning. They were distributed into 5 groups at Ist post-weaning oestrus, fed 1.8 kg feed/d (3 000 kcal DE/kg and 13.5 p. 100 TCP) during gestation, 3 kg/d (group 4) and 6 kg/d (group 5) during lactation (3 O50 kcal DE/kg and 17 p. 100 TCP) and slaughtered at different stages of the reproductive cycle. At slaughtering, viscera and carcass weights were measured. Fat and muscle thickness were estimated and fat and eye muscle areas were measured on a cross section of the loin. The carcass was thereafter cut and the different cuts weighed. After measurement of its specific gravity a ham was dissected. The dry matter and lipid content of M. longissimus dorsi were determined. During gestation the net weight gain of sows was negative (5.6 kg), but this weight loss remained restrictcd as compared to that observed in non-mated females (group 3 :

Body composition changes of multiparous sows during the reproductive cycle. Influence of the level of feed intake during lactation