Costs related to the control of lactating cows and milk sampling are quite high, but obtained data and their accuracy are not satisfactory. Consequently, results of selection assessment of bulls’ fathers and mothers are not complete (Sprengel et al., 2001). Costs of milk productivity control...

The research focused on two production systems of fattening pigs: conventional system (housing on cross - barred floor) and ecological system (housing on deep litter). Favorable climatic conditions for pig meat production, possibilities to produce cheaper food of better quality and great amounts...