Abstract
The lead concentration in the blood of calves was mainly examined together with the blood examination to investigate the appearance of lead contamination of a farm where lead poisoning had occurred. The clinically normal Japanese Black beef cattle, 10 days of age, was used on 50 calves from an affected farm and 14 calves from a non-affected farm. Results obtained were as follows: 1) The lead concentration in the blood of calves from the affected farm was 51.5±53.1μg/100ml and this was found to be significantly higher than that (7.9±3.6μg/100ml) of calves from the non-affected farm (P<0.01). 2) The free erythrocyte protoporphyrin concentration of calves from the affected farm was higher than that of calves from the non-affected farm, and a significant correlation was found between them (P<0.05). 3) The calves of the affected farm had been reared in three cattlesheds which were built in 1981 (No.1), 1982 (No.2) and 1983 (No.3). The lead concentration in the blood of calves in each cattleshed was 12.4±7.9μg/100 ml, 48.8±48.9μg/100 ml, 81.8±57.3μg/100 ml, respectively. Comparing these results, the lead concentration in the blood of calves in the newer cattleshed was found to be significantly higher than older ones (1vs 2: p<0.05, 1vs3: p<0.01, 2vs3: p<0.05). 4) The activity of erythrocyte δ-aminolevulinic acid dehydratase of the calves in the newer cattleshed was found significantly lower than older ones (1vs2: p<0.05, 1vs3: p<0.01). 5) The erythrocyte number, packed cell volume and hemoglobin concentration of calves in each cattleshed were not significant but the respective level of the calves in the newer cattleshed had a tendency lower than older ones. 6) The activity of γ-glutamyl transpeptidase of the calves from the affected farm seemed to be higher than normal. These results indicated that the lead contamination was found in calves of the affected farm, and lead contamination of the calves in the newer cattleshed was higher than older ones.
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