Long time grazing of lucerne-cocksfoot and lucerne-cocksfoot-sainfoin swards is supposed to result in a decline of dry matter yields, to reduce the persistence of the sward and to influence the morphology (root collar thickness and crown diameter) and the regrowth of lucerne from root collars and from the stubble. In the years 2000-2004 in the trial run at IUNG-PIB Grabów (province of Mazovia) yields, persistence, regrowth, root collar thickness and crown diameter of lucerne grown in six different associations with cocksfoot or with cocksfoot and sainfoin grown under two grazing systems (short-time: 1-2 days of grazing and 30 days of regrowth, long-time: 7-8 days of grazing followed by 23-24 days of regrowth) were investigated. It was found in the trial that the impact of grazing system became evident only in the third year of sward utilization and that, under a short-time grazing, a significantly higher yield was obtained as compared to that under a long-time grazing. The cultivars Luzelle and Legend were characterized by a higher dry matter yield and by a better regrowth from the stubble as compared to the cv. Kometa. Under the trial conditions the duration of grazing and specific composition of the mixtures had no effect on the number of lucerne shoots in 0.5 kg of the herbage, on the crown diameter or on the regrowth of lucerne from the stubble. A short-time grazing of the mixtures (1-2 days of grazing followed by 30 days of regrowth promoted better foliage development, an increased root collar thickness and increased the persistence of lucerne plants when compared to the short-time grazing (7-8 days of grazing followed by 23-24 days of regrowth). Due to a low dry matter yields, tall shoots and low persistence under long- or short-time grazing the Kometa cv. should not be grown in associations with cocksfoot or with cocksfoot and sainfoin to be grazed by cattle.
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