[Dynamics of abrasion of lead pellets in the gizzard of domestic ducks].

Experiments were made with 6 control and 6 experimental ducks. 10 lead shot were given for once into the gizzard of the experimental animals. During a period of 6 days, changes of the form of the grains of shot, the ALAD-activity, the hematocrit and the hemoglobin have been examined. Finally, significant changes of the form as well as the surface of the lead shot could be seen. The average loss of mass of one grain of shot in 24 hours (former mass 0,15 g) came up to 0,01 g. Already 24 hours after the ducks had received the grains of shot, the ALAD-activity decreased from 70,07 to 5,43 U/l-1. As far as the hematocrit and the hemoglobin are concerned, compared with the control ducks, there were no important differences.