A COMPARATIVE STUDY OF THE EFFECTS OF MALEIC HYDRAZIDE AND p-DIMETHYLAMINOAZOBENZENE ON RAT LIVER
Rats receiving 2% maleic hydrazide (MH) in their diet and rats fed 0.06% p-dimethylaminoazobenzene (DAB), for periods up to 26 weeks, were compared with a control group on a stock diet. For the rats on DAB there was a decrease in body weight, in desoxyribose nucleic acid (DNA) per liver cell nucleus, and in the size of the average liver cell. There was an increase in liver weight, in DNA per liver, and in the number of cells per liver. These findings confirmed previous work with this compound. No significant changes were found in any of these measurements for the rats on MH. Pathological study revealed liver neoplasms in all animals fed DAB for 10 weeks or longer. No abnormal findings were reported for any rats on MH. The results indicate that maleic hydrazide, an antisprouting agent, does not produce any effects in rat liver similar to those caused by DAB, a known carcinogen.