HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Crane, D. S. D. Articles by Rodriguez, R. E. Search for Related Content PubMed PubMed Citation Articles by Crane, D. S. D. Articles by Rodriguez, R. E.

Relation of Age and Weight at Puberty to Reproductive Performance in Two Lines of Mice Selected For 42-Day Weight

University of Florida,¹ Gainesville 32601

Abstract

Age and weight at puberty and correlated response in reproductive performance were determined for two lines of mice (L1 and L2) selected for individual 42-day weight. L1 was maintained on a high-energy diet (D1) and L2 on a low-energy diet (D2). Mice from each of the two lines were also maintained on the opposite diet. The L1/D1, L1/D2, L2/D1 and L2/D2 respective subgroup means for age at puberty (days) were 30.8, 38.4, 29.0 and 36.2 and weight at puberty (g) were 20.9, 18.5, 19.2 and 17.7. Pooled heritability estimates of age and weight at puberty were respectively 0.43 and 0.33. Linear regressions of age on weight at puberty were 0.49 (L1/D1), 0.69 (L1/D2), 0.29 (L2/D1) and 0.57 (L2/D2). Age at puberty was negatively correlated with first litter size (–.11), first litter birth weight (–.25) and number of embryos, second litter (–.35). Weight at puberty was positively correlated with first litter size (0.24), first litter birth weight (0.27) and number of embryos, second litter (0.38).

¹ Department of Animal Science.