[Influence of female age on litter size and sex ratio of Blue Polar fox offsprings]
1986
Kuzniewicz, J. (Akademia Rolnicza, Wroclaw (Poland). Zaklad Hodowli Owiec i Zwierzat Futerkowych)
The data of 1,030 litters were analysed. The highest number of puppies at birth was noted in females, two years old, and the highest number of reared ones in females, 4 and 7 years old. The female age and litter size effects on the sex ratio of puppies were significant. The highest number of males was obtained from females 2 and 3 years old in litters with 1 to 9 puppies
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