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In this study, we analyzed the effect of rearing system of ducks on the quantitative and qualitative composition of their gut microfl ora. 180 ducks and 180 drakes of Pekin 44 and Muscovy MR71 lines were kept in the intensive system on litter; the same number of birds was kept in the semi-intensive system. In the latter, starting from the 3rd week of life the birds were allowed to use free ranges. After slaughter of 15 ducks and 15 drakes from each group, their intestinal digesta was subjected to microbiological analysis. The possibility of using the free ranges had a positive effect on the quantitative and qualitative composition of intestinal microfl ora of these birds. The count of aerobic mesophilic heterotrophs in the intestinal digesta of ducks was higher in the case of birds kept in the semi-intensive system. More benefi cial results were achieved in the case of Muscovy ducks considering mainly the coli/lacto ratio which was the lowest (0.08) in this group for both sexes kept on free range. Noteworthy is also that no pathogenic bacteria of the genera: Salmonella, Proteus, Pseudomonas, Staphylococcus, Clostridium perfringens and Escherichia coli were found in any of the analyzed samples.
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Production and trade of duck products in global view

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Duck typically represents a smaller proportion in the poultry meat production of the world. However, certain European, as well as Eastern and South Asian countries produce a significant amount of duck meat. In the recent decades, production significantly increased both in these regions and worldwide. This study focuses on the international situation of the duck sector, as well as changes in production and trade trends. In addition, RCA indexes were used to examine the comparative advantages of duck meat and meat products in the world market of waterfowl products in the case of the most significant exporting countries of the world. It can be concluded that even though certain exporting countries have various trade and competitive advantages in the case of different products, other regions must face disadvantages.
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