Reproductive performance and growth in captive collared lemmings (Dicrostonyx groenlandicus)

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Abstract
Various aspects of reproduction and growth were studied in a laboratory colony of collared lemmings (Dicrostonyx groenlandicus). Males and females were maintained successfully as breeding pairs, and as many as 17 successive litters were produced by one pair. Litter size increased with parity through the third litter and decreased after the eighth. Gestation, which was 19.5 to 21.5 days in non-lactating females, was extended to a maximum of 23 days in lactating females. Postpartum estrus continued throughout the duration of lactation in some females. Males made up less than 38% of the total number of lemmings produced in the colony, regardless of litter size or age at sexing. There was a significant amount of heterogeneity in the sex ratios produced by different pairs of lemmings. Rabbit chow increased reproductive performance compared with a fresh produce diet. Reproductive performance was increased by long photoperiod compared with short photoperiod. Birth weight was independent of litter size but weaning weight was negatively correlated with size of the litter.

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