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The study was conducted in the years 1989-1993. The Black Kite fed primarily on birds and fish, Red Kite — on birds, mammals and carrion. The White-tailed Eagle preyed almost exclusively on birds and fish, and the Lesser Spotted Eagle on small mammals, birds and frogs. The White-tailed Eagle was the most specialized species. Its food niche breadth was smallest among the studied species and food taken in water habitats accounted for 95% of its diet. The Black Kite had the widest food spectrum in terms of the frequency of prey while the Red Kite — in terms of the biomass consumed. The mean body mass of prey specimens taken by the White-tailed Eagle was 578 g, by the Red Kite — 235 g, the Black Kite — 230 g, and the Lesser Spotted Eagle — 34 g. The food niches of both Kites and the White-tailed Eagle strongly overlapped. The smallest overlap was between the food niches of the two Eagles and between the Lesser Spotted Eagle and the Black Kite.
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Livestock production is characterised by cyclical fluctuations. Apart from a widely known and documented phenomenon known as “pork cycle” there is also a less known “cattle cycle”, which was presented on the example of the United States. This country has been considered given the fact that it is the biggest world beef producer and that the production in this country is characterised by industrial scale of high level of vertical coordination development. The last factor is often considered as a factor eliminating cyclical fluctuations.The conducted research confirmed that the curves of population, slaughter and beef price are characterised by cyclical fluctuations caused directly by the changes in the profitability of breeding, which are expressed in the relationship between the beef and maize prices. The analysis has shown that in the recent years the role of cattle price weakened and the role of maize price, which has a greater impact on the relationship, strengthened. The knowledge of the cattle cycle mechanism is especially useful when projecting the population, production and prices of beef. Thus these phenomena should be constantly observed.
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