Study of the content of heavy metals related to environmental load in urban areas in Slovakia.

Unlabelled: It is natural for the man to take care of his environment so the negative influences of intensification of industrial and agricultural production and the entire process of pollution are kept at minimum or eliminated as early as possible. However, they must first be identified.

Background: companion animals, for example dogs, are a very good indicator of the pollution load on the environment.

[The effect of cadmium on the protozoan population and rumen fermentation of feed in an artificial rumen].

In our experiment, the effects of 5, 10 and 20 mg cadmium per kg dry matter (DM) on protozoan population and rumen fermentation of feed ration consisting of 11.7 g DM of hay and 2.8 g DM of barley (80: 20%) were followed in artificial rumen (Rusitec).

[The effect of cadmium on indicators of rumen fermentation and their levels in biological material in sheep].

The experiment was carried out with three groups, each consisting of six adult sheep of the Merino breed weighing 40-45 kg, fed with the diet composed of 1 kg of meadow hay and an addition of 0.2 kg of barley meal for 3 weeks before the experiment. The first group - the control - was provided the natural supply 0.

[Manganese levels in biological materials from dairy cows].

Manganese in serum, hair and excrements of 2,720 dairy cows was determined under the practical conditions of animal husbandry. Mn content in the above-mentioned materials indicated the state of sufficient supply in 1,480 dairy cows and Mn deficiency in 1,240 dairy cows. The results of Mn content in the followed materials obtained from dairy cows in a different state of organism supplying are presented in Tabs.

[The effect of copper and cobalt supplementation on the digestibility of fibrous feed in sheep].

The effects of an addition of copper, cobalt, and copper + cobalt on the in vitro digestibility of hay, treated beech sawdust and cellulose by the rumen fluid of sheep fed a complete food ration, complete food ration with 15% treated beech sawdust and a diet consisting of 80% hay and 20% barley were investigated, respectively. The rumen fluid obtained from animals fed a complete food ration showed the significantly higher digestibility of hay (Tab. I) when Cu (P less than 0.