Животный мир

This article is devoted to an analysis of possible bivoltine development of several bumblebee species in Europe. This study is based on materials collected by the authors in European countries (Slovakia, France and Greece) and in the European North of Russia (Solovetsky Archipelago). Four bumblebee species were studied. They are Bombus hortorum, B. terrestris, B. pratorum and B. jonellus. Bombus hortorum was collected from south-eastern Slovakia and southern France, B. terrestris was additionally from the Isle of Crete, B. pratorum was from southern France and the Solovetsky Archipelago, and B. jonellus was collected only on the Solovetsky Archipelago. Our records reveal that several bumblebee species may have two generations per season. Bombus hortorum and B. pratorum in south-eastern Slovakia and southern France had males present in late May. Both these species have a short life cycle, so they are potentially able to produce two generations in a season. Bombus terrestis was found in January on southern France and in Late November in the Isle of Crete. Because this species has no obligate diapause, this fact may indicate bivoltine development for B. terrestris in the studied territories. The potential ability of B. jonellus to produce two generations per season was revealed during long-term research on the Solovetsky Archipelago.

To define rational amount of floor space per bird and study productive qualities of broilers of cross «Ross-308» depending on the rate of floor space per bird at growing, in cage batteries and on litter the investigations at broilers enterprises of the Orel region were carried out. Broilers were grown in cages KP-8L from the day age and to slaughter (tests 1 and 2) and on litter using floor equipment set of firm «Big Dutchman» (Germany). The number of chickens in the test groups was 90-108 heads. The basic technological parameters of chicken keeping (lighting program, microclimate, feeding program, and mixed feed nutrition) were the same for all groups and corresponded to «Maintenance of «Ross» broilers growing (2009)». At doing research and economic tests the zootechnic factors of broilers growing according to common methods were defined. Statistical analysis of the obtained data was done using personal computer with «Microsoft Excel» (2003) and «Statistica» software. It was proved that according to productive and zootechnic factors complex that rational amount of floor space per bird for broilers of cross «Ross-308» at duration of 38 days fattening to obtain 2,2 – 2,3 kg live weight is 25 birds/m2 at growing chickens in cages, or 394,0 sm2/bird; 20 birds/m2 at growing chickens on litter. Due to chicken intensive growing in the best test groups feed conversion (1,69-1,75 kg) and European Productivity Index (EPI) (335,73- 346,65 units) have improved. Poultry population safety in the groups with optimal amount of floor space per bird was 98,0 - 98,1%. At selection of amount of floor space per bird of broilers first of all is necessary to consider the implied final poultry weight. doi: 10.15217/279701