To facilitate the work of harvesting unequally ripened crops of clover, and to reduce the risk of loss, farmers use, among other things, the sodium salt of monochloracetic acid as an agent to produce early ripening. A few days after spraying with 20 kg per hectare dissolved in 500 1 of water the crop will have withered and dried up, being then ready to be harvested mechanically. Since monochloracetate is used on seed-crops and is decomposed by soil bacteria (JENSEN 1957(JENSEN , 1959(JENSEN , 1960, the chance of its poisoning domestic animals is regarded as negligible. The same has been claimed to apply to game, but in 1958 a report was received of poisoning after spraying that killed a flock of wild geese (Grey Lag Goose, Anser Anser L) . (1958)(1959) reports as fOllOWS : ROSEN0RN-LEHNOn August 4, 1958, between 10 a.m. and 4 p.m., a white clover field of 18 hectares was sprayed with a solution of 18 kg sodium monochloracetate in 400 1 of water, to which had been added a 1 % (v/v) solution of sulphonated detergent per hectare.About 170 wild geese, which used to spend the nights on a reservation 1 km from the clover field, had for some time been foraging on a neighbourpg field of Poa pratensis. This crop had been harvested and the straw burnt off on the same day as the clover field was sprayed with monochloracetate. The geese therefore sought their food in the newly sprayed clover field. The next few days the geese were not observed, and they were then all found dead on their reservation.Everything pointed to poisoning with monochloracetate. As, however, the geese were in a state of advanced decay and disintegration, this diagnosis could not be confirmed. We therefore thought it appropriate to investigate the toxic effect of monochloracetate on geese. Material and Methods.As test animals we used young full-grown domestic geese weighing from 4.5 to 5 kg.The birds were exposed to sodium monochloracetate of 97.5 % (w/w) purity, either by
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