Szukana fraza: [Opis = "Onset and duration of microtine reproduction varies with the cycle phase in cyclic populations and is temporally stable in non\-cyclic populations. The reproductive variation has been related to annually more or less varying growth rates, including varying contents of chemical stimuli of food plants, or to effects of maternal condition, especially nutrition, on the reproductive performance of the succeeding generation. To distinguish between these two explanations, immatures of Microtus agrestis were caught at annual density peaks in south Sweden and were kept under constant laboratory conditions by natural light and on a simplified food with stable composition for one year or until reproduction ended. Their yung were kept in exactly the same way."]

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