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Contamined hay harvested in the south-east of France in June 1986 was fed to 4 pregnant ewes from about 1 month before to 1 month after lambing. The cae­ sium body burdens ( 137 Cs and 134 Cs) of ewes and lambs (n = 6) were assessed by whole-body counting ; the milk intake of the lambs was estimated as a func­ tion of their daily weight increase. The mean milk and meat transfers in ewes, between D10 and D30 after lambing were respectively 4.7 ± 1.4 % and 7.9 ± 1.7 %. At birth the mean caesium body burden of the lambs was 3.2 ± 8 % of the dam body burden ; at weaning (D30) the mean retention of the ingested radio- caesium was 39 + 6 % vs 27.3 + 3.2 % for the dams. The spontaneous decorpo- ration half-time of caesium in lambs at weaning was about 14.5 days (mono- exponential curve) vs about 26 days for the dams (long component of bi-exponential curve). Meat transfers, uptake and spontaneous decorporation parameters were also studied : 1) in 4 lambs from 1 to 3 months after weaning ; and 2) in 3 young animals between 9 and 10 months after birth. The values of the different parameters of caesium transit in neonates and lambs are discussed with regard to contamination accident management.

Transfert du radiocésium présent dans du foin contaminé par les retombées de Tchernobyl à des brebis gestantes et à leurs produits à différents âges