Key points are not available for this paper at this time.
S. N. Atkinson, M. A. Ramsay, The Effects of Prolonged Fasting of the Body Composition and Reproductive Success of Female Polar Bears (Ursus maritimus), Functional Ecology, Vol. 9, No. 4 (Aug., 1995), pp. 559-567
Atkinson et al. (Tue,) studied this question.