Selection for postweaning gain in rats: II. Correlated response in reproductive performance.

J. G. Rios, M. K. Nielsen, G. E. Dickerson

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Reproductive performance was evaluated on lines of rats selected 34 generations for up (U) and down (D) 3- to 9-wk weight gain and from a control (C). Direct response to 3- to 9-wk weight gain was 16% in U and -8% in D lines. Inbreeding was similar among lines. Both selection lines were poorer in percentage of fertile pairs than the C line, especially so in D (P less than .10). The lines differed (P less than .05) in litter size born with means of 11.4, 10.4 and 9.6 for U, C and D, respectively. The significant positive correlated response in litter size corresponded to that expected from intraline association with female body weight. Selection for increased postweaning gain resulted in 5% earlier age but little change in weight at vaginal opening. The D line was similar to C in age, but 7% lighter in weight at vaginal opening. The U line was significantly higher (14, 12 and 69%) for ovulation rate, number of fetuses and post-implantation losses, but not for pre-implantation losses. The D females were similar to C females in all components of litter size. Males of all lines were similar in age at first mating, but U males were 22% heavier than C males in weight at first mating. A positive correlated response in weight of testes at 91 d of age disappeared when adjusted for intraline association with body weight.

Original languageEnglish (US)
Pages (from-to)46-53
Number of pages8
JournalJournal of animal science
Volume63
Issue number1
DOIs
StatePublished - Jul 1986

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correlated responses
Litter Size
reproductive performance
litter size
Weights and Measures
rats
Weight Gain
weight gain
Body Weight
body weight
Inbreeding
Ovulation
inbreeding
fetus
ovulation
Testis
testes
Fetus

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

Cite this

Selection for postweaning gain in rats : II. Correlated response in reproductive performance. / Rios, J. G.; Nielsen, M. K.; Dickerson, G. E.

In: Journal of animal science, Vol. 63, No. 1, 07.1986, p. 46-53.

Research output: Contribution to journalArticle

Rios, J. G. ; Nielsen, M. K. ; Dickerson, G. E. / Selection for postweaning gain in rats : II. Correlated response in reproductive performance. In: Journal of animal science. 1986 ; Vol. 63, No. 1. pp. 46-53.
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