vetmed

PAPER SELECTED

Effect of cadmium on the rumen protozoan population in sheep

KISIDAYOVA S, SVIATKO P, ZELENAK I
Veterinarni Medicina 45, 2000, 343-346

The effect of increased cadmium doses on the rumen ciliate population in sheep was investigated. The experiment was carried out on 18 adult Merino sheep fed a diet composed of meadow hay and barley meal for 3 weeks prior to and during the experiment. The cadmium content of the diet (control value) was 0.09 mg/kg dry matter of feed (DM). Increased doses were 5 mg Cd/kg DM and 10 mg Cd/kg DM. Protozoa in the ruminal fluid of sheep were examined throughout seven weeks. Entodinium spp., Dasytricha runinantium, Isotricha spp., Ophryoscolex caudatus tricoronatus, Polyplastron multivesiculatum and the total number of ciliates were counted. Short-time supplementation of cadmium (day 20) increased the total number of ciliates and the number of all protozoan groups examined. No significant effect on the protozoan population can be seen after long-term supplementation of the cadmium doses tested (on day 47)


FULL PAPER on request
« back