A COMPARATIVE STUDY ON SOME TECHNICAL AND ECONOMIC PARAMETERS OF TWO- AND THREE-LINE BUILDINGS FOR FREE REARING OF COWS WITH CLOSED CYCLE OF REPRODUCTION
2008
Dimitrov, V., Thracian University, Stara Zagora (Bulgaria) | Dinev, D., Thracian University, Stara Zagora (Bulgaria)
The objective of the study was to compare two- and three-line buildings for free rearing of cows with closed cycle of reproduction on their basic space-planning parameters, the use of basic construction materials and capital investments for construction of the technological profile of their floors as well as to outline the most economical and practically recommendable variants. A total of 8 technological variants were compared of semi-open buildings (4 for two-line and 4 for three-line buildings) respectively for 40, 60, 80 and 100 cows with the female calves from 3 to 27 months of age and the male calves from 3 to 6 months of age. It was obtained that at the same capacity the two-line buildings were more economical than the three-line ones in terms of the relative built-up areas and the volume and consumption of concrete and reinforced steel for constructing the technological profile of the floor. With the same capacity, the three-line buildings were more economical than the two-line ones in terms of the relative consumption of profile steel and to total capital investments for constructing the technological profile of the floor. With the increase of the capacity from 40 to 100 cows all the parameters studied in both types of buildings – two- and three-line ones – decreased considerably. For example, the total capital investments for the technological profile of the floor decreased from BGN 972 to BGN 863 per cow, i.e. by 12,6%. The variant with three lines of cubicles for 100 cows was the most economical one. It required lower building cost of the technological profile of the floor compared to the other variants.
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