Selection for postweaning gain in rats: I. Correlated response in feed utilization and body composition.

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Response to selection for up (U) and (D) 3- to 9-wk gain in rats on average daily gain (ADG), average daily feed intake (ADI), gain/feed (G/F), body composition (BC), fasting metabolic rate per unit metabolic size (MR) and partial efficiency of weight gain (ADG/Fg) was evaluated after 34 generations of mass selection. At 3-wk weaning, 120 litters representing F1 crosses of two replicates within each of the U, D and control (C) selection lines were divided within sexes between bulk-feeder and tube-feeder cage types for recording feed intake until 9 wk of age. Rats from tube-feeder cages representing 16 litters/line were utilized for MR and BC data. Response in ADG was asymmetrical; 16% higher for U line but only 8% lower in D line, compared with C line. Correlated responses were positive and significant in both U and D lines for ADI (6% and -3%) and G/F (5% and -5%). Line differences in MR were not significant but both selected lines were slightly higher than C line in MR at 6 wk of age, and the reverse at 9 wk of age. Over the period of 6 to 9 wk of age, maintenance requirements per unit metabolic size and ADG/Fg were 1 and 5% above for the U and -1 and -4% for D lines, relative to C line. Females of both selected lines were fatter than C line (P less than .05) at 9 wk of age, but only D line males were fatter than C line.

Original languageEnglish (US)
Pages (from-to)34-45
Number of pages12
JournalJournal of animal science
Volume63
Issue number1
DOIs
StatePublished - Jul 1986

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correlated responses
Body Composition
body composition
average daily gain
feed conversion
Fats
Dilatation and Curettage
rats
Weaning
feed intake
Weight Gain
Fasting
Maintenance
cages
line differences
lipids
fasting
weaning
weight gain
gender

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

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Selection for postweaning gain in rats : I. Correlated response in feed utilization and body composition. / Rios, J. G.; Nielsen, M. K.; Dickerson, G. E.; DeShazer, J. A.

In: Journal of animal science, Vol. 63, No. 1, 07.1986, p. 34-45.

Research output: Contribution to journalArticle

Rios, J. G. ; Nielsen, M. K. ; Dickerson, G. E. ; DeShazer, J. A. / Selection for postweaning gain in rats : I. Correlated response in feed utilization and body composition. In: Journal of animal science. 1986 ; Vol. 63, No. 1. pp. 34-45.
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