[The tolerance and residue accumulation of sodium-2,2-dichloropropionate (Dalapon) administered over 90 days to dairy cows]

The influence of the pesticide Sodium-2,2-dichlorpropionate (Na-DCP; Dalapon) was investigated on dairy cows concerning of its effect on ability and health condition. The investigations were carried out in practice using several parameters (feeding, efficiency, haematological and clinicochemical parameters, tests of the slaughtered organisms including their patho-histological examination). The arising of residues was controlled in milk, organs and tissue as well. The pesticide was daily applied orally with the feedstuff in 3 different dosages (2.5, 10, 30 mg/kg b. w./d). Feedstuff consumption, results of milk production and milk quality were not influenced by Na-DCP. The presented results can not verify with safety the insignificant alterations of some clinicochemical parameters (Creatinine, Bilirubin). Direct after the deposit of Dalapon in all samples of milk, organs and tissue residues of this pesticide could be observed. The maximum tolerable residue levels for animal in the ex-GDR were exceeded under these conditions.

[Use of mestranol as an anabolic substance in fattening bulls]

In 5 experiments 137 fattening bulls received between 0 and 20 mg Mestranol per animal and day. In one experiment a dose of 10 mg/day reduced consumption. The cause of this effect could not be found. In three experiments Mestranol increased weight gain by 4-13%. Feed expenditure was significantly decreased in only one experiment, in which 5-10 mg were given (average of all experiments: 4%). In dependence on the amount of Mestranol the weight of skin, horn and testicles decreased, when only 5-10 mg were given, however, protein retention increased whereas fat retention decreased. When 20 mg Mestranol are given per animal and day, the anabolic effect is missing although the NEFcattle-expenditure per kJ retention including maintenance decreases. This is due to a higher fat retention, which is causally inexplicable. The ergotropic effect of Mestranol depends on its dosage and possibly the nutrients in the ration.