Difference between Species in the Metabolism of Technogenic Radionucleids in the Mammary Gland of Dairy Animals

Tz. HINKOVSKI1 and V. MARINOV2

1 Agricultural Academy, BG-1373 Sofia, Bulgaria
2 Central Laboratory of Radiation Protection and Technology, BG-1360 Sofia, Bulgaria

Abstract

HINKOVSKI, Tz. and V. MARINOV, 1999. Difference between species in the metabolism of technogenic radionucleids in the mammary gland of dairy animals. Bulg.J.Agric.Sci., 5: 757-460

As a result of the accident at the Chernobyl Nuclear Station on April 26, 1986, there was a radioactive contamination of a large part of Europe. Shortly after the accident, as early as the first days of May, the Agricultural Academy launched studies of the differences between species in the metabolism of technogenic radionucleids in the mammary of productive animals based on the characteristics of the radioactive contaminant and the specifics of the animal nutrition technologies.
The highest rate of contamination of milk with iodine-131, cesium-137 and cesium-134 was observed in sheep (10535 Bq/l) followed by goats (2432 Bq/l) and cows (1360 Bq/l). Buffalo milk was reported for the lowest content of the three radionucleids (477 Bq/l). The presence of iodine-131 in buffalo milk was 34.4 times lower than sheep, 7.2 times lower than goat and 3.9 times lower than cow milk. In terms of cesium-137 these values were 1.7, 1.5 and 1.2 times, respectively. Therefore, in the same conditions of permanent radioactive contamination of feed for dairy animals, buffalo milk, due to a peculiarity of the metabolism mainly of iodine 131, proved to be raw material and food to be preferred especially in the period of the so called "iodine hazard" vs. the remaining milk types.

Key words: technogenic radionucleids, dairy animals, metabolism, mammary