Comparative histopathological effects of ethylene-bis-dithiocarbamate on the testis in rabbits and rats

Maneb is an ethylene-bis-dithiocarbamate fungicide used in the control of the fungal diseases of plants. Males of domestic rabbits Oryctolagus cuniculus and Wistar rats received daily by gavage 2 and 3 mg/kg body weight of Maneb for 3 weeks. At the end of the treatment, the animals were sacrificed and the testis's samples were weighed and placed in formol 10% solution. The histopathology changes study was made in accordance with Martoja and Martoja, 1967 method. The obtained results show a very considerable reduction of the weight of testes in treated animals compared to the control group especially in the rabbits. A very reduction in testosterone concentration was noticed in the treated rabbits. The histological observation showed that no effect was observed in the testes in rats. Then, the testicle of treated rabbits with 2 mg/kg body weight reveal seminal tubules in involution Sertolienne and Leydig cells are a little too visible. White rabbits treated 3 mg/kg indicates that there is no spermatozoa in the epididymis, the most of the tubules are empty as compared to control. The testis in the control show normal spermatogenesis and the mitoses are distributed to all levels and spermatozoa are observed in many tubules and epididymis. In conclusion, administration Maneb with the used doses affects histological deformation in the testis of rabbits.

Hypothyroidism after medium exposure to the fungicide maneb in the rabbit Cuniculus lepus

Dithiocarbamate are widely used as fungicides because of their efficacy against a broad spectrum of fungi and their associated plant diseases. Maneb is one of Ethylenebisdithiocarabamate (EBDCs). Males domestic rabbits received (by gavage) 2, 3, 5 and 8 mg/kg body weight of maneb, for a period of 5 weeks. Total body weights were measured at 48 h interals. At the end of the experimental period, animals were sacrified and some of organs such as, liver, testes, spleen and the kidney were weighted. The obtained data reveal that the used fungicide induces a remarkable increase in body weight of all the treated animals, particularly with the higher dose as compared with control group. An increase in plasma triglycerides, glucose and of cholesterol levels has been recorded. Moreover, a reduction in the weight of kidneys and testes in animals receiving 5 and 8 mg/kg, while a remarkable increase in the weight of the liver has been observed. Thyroxin concentrations underwent a significant reduction in treated individuals. A very significant reduction in, the number, speed and mobility of spermatozoa accompanied with a high ratio of spermatozoa deformation in the treated groups was noticed. In conclusion, administration of maneb causes thyroid pathology and affects the biology of sperms with histological deformation of testes.