Abstract

Outdoor species Mus spicilegus Petenyi, 1882 were trapped in 2004–2006 on fields of eastern Slovakia in vicinity of village Kechnec (48°33′7.2′′ N, 21°14′25.0′′ E; 200 m a.s.l.). Spring-summer population demography and reproductive aspects (in period March – June) were analyzed in this study. Totally, 51 individuals of the outdoor mound-building mice were trapped. The sex ratio was in favor of males (χ2 = 1.96, df = 1, p > 0.05). Prevalence of adult mice was significantly higher than of subadults, and it was noticeable in males (χ2 = 9.75, df = 1, p < 0.01). For five pregnant females trapped during 2004–2006 average litter size was 8.6 (7–10) embryos per female. Evaluation of all pregnant females (n = 9) from Slovakia (2002–2006) confirmed similar values – 8.3 (6–10) embryos per female.

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