Limits to sustained energy intake II. Inter-relationships between resting metabolic rate, life-history traits and morphology in Mus musculus

M S Johnson, S C Thomson, J R Speakman

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Abstract

Links between resting metabolic rate (RMR) and reproductive output have been previously sought at both inter- and intraspecific levels, but have only been found in some interspecific studies, We aimed to examine correlations between RMR measured both prior to breeding and at peak: lactation with litter size and litter mass in Mus musculus. By manipulating the litter size of some females at birth, we aimed to establish the direction of causality in any correlation between litter size and RMR. Correlations between maternal morphology and RMR, litter size and litter mass were also examined. Neither pre-breeding RMR nor mass-independent pre-breeding RMR was correlated with litter size or litter mass. RMR at peak lactation, however, was positively correlated with litter size and negatively correlated with mean pup mass. After correcting for the effects of body mass, residual peak lactation RMR was not correlated with litter size or litter mass. Body size was the major morphological variable influencing litter mass, offspring mass and asymptotic food intake. Mammary tissue mass was correlated with litter size when only the data for mice raising unmanipulated litters were used. RMR at peak lactation was significantly related to the principal component of morphology dominated by carcass mass, This study confirms the findings of previous intraspecific and some interspecific studies that found no correlation between RMR and reproductive output after the effects of body mass had been removed.

Original languageEnglish
Pages (from-to)1937-1946
Number of pages10
JournalJournal of Experimental Biology
Volume204
Publication statusPublished - 2001

Keywords

  • energetics
  • maximal metabolic rate
  • sustained metabolic rate
  • pregnancy
  • lactation
  • reproduction
  • mouse
  • REPRODUCTIVE ENERGETICS
  • INTRASPECIFIC VARIATION
  • PEROMYSCUS-MANICULATUS
  • TENRECIDAE MAMMALIA
  • LACTATING MICE
  • BODY SIZE
  • BIRDS
  • INSECTIVORA
  • BUDGETS
  • CONSTRAINTS

Cite this

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title = "Limits to sustained energy intake II. Inter-relationships between resting metabolic rate, life-history traits and morphology in Mus musculus",
abstract = "Links between resting metabolic rate (RMR) and reproductive output have been previously sought at both inter- and intraspecific levels, but have only been found in some interspecific studies, We aimed to examine correlations between RMR measured both prior to breeding and at peak: lactation with litter size and litter mass in Mus musculus. By manipulating the litter size of some females at birth, we aimed to establish the direction of causality in any correlation between litter size and RMR. Correlations between maternal morphology and RMR, litter size and litter mass were also examined. Neither pre-breeding RMR nor mass-independent pre-breeding RMR was correlated with litter size or litter mass. RMR at peak lactation, however, was positively correlated with litter size and negatively correlated with mean pup mass. After correcting for the effects of body mass, residual peak lactation RMR was not correlated with litter size or litter mass. Body size was the major morphological variable influencing litter mass, offspring mass and asymptotic food intake. Mammary tissue mass was correlated with litter size when only the data for mice raising unmanipulated litters were used. RMR at peak lactation was significantly related to the principal component of morphology dominated by carcass mass, This study confirms the findings of previous intraspecific and some interspecific studies that found no correlation between RMR and reproductive output after the effects of body mass had been removed.",
keywords = "energetics, maximal metabolic rate, sustained metabolic rate, pregnancy, lactation, reproduction, mouse, REPRODUCTIVE ENERGETICS, INTRASPECIFIC VARIATION, PEROMYSCUS-MANICULATUS, TENRECIDAE MAMMALIA, LACTATING MICE, BODY SIZE, BIRDS, INSECTIVORA, BUDGETS, CONSTRAINTS",
author = "Johnson, {M S} and Thomson, {S C} and Speakman, {J R}",
year = "2001",
language = "English",
volume = "204",
pages = "1937--1946",
journal = "Journal of Experimental Biology",
issn = "0022-0949",
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TY - JOUR

T1 - Limits to sustained energy intake II. Inter-relationships between resting metabolic rate, life-history traits and morphology in Mus musculus

AU - Johnson, M S

AU - Thomson, S C

AU - Speakman, J R

PY - 2001

Y1 - 2001

N2 - Links between resting metabolic rate (RMR) and reproductive output have been previously sought at both inter- and intraspecific levels, but have only been found in some interspecific studies, We aimed to examine correlations between RMR measured both prior to breeding and at peak: lactation with litter size and litter mass in Mus musculus. By manipulating the litter size of some females at birth, we aimed to establish the direction of causality in any correlation between litter size and RMR. Correlations between maternal morphology and RMR, litter size and litter mass were also examined. Neither pre-breeding RMR nor mass-independent pre-breeding RMR was correlated with litter size or litter mass. RMR at peak lactation, however, was positively correlated with litter size and negatively correlated with mean pup mass. After correcting for the effects of body mass, residual peak lactation RMR was not correlated with litter size or litter mass. Body size was the major morphological variable influencing litter mass, offspring mass and asymptotic food intake. Mammary tissue mass was correlated with litter size when only the data for mice raising unmanipulated litters were used. RMR at peak lactation was significantly related to the principal component of morphology dominated by carcass mass, This study confirms the findings of previous intraspecific and some interspecific studies that found no correlation between RMR and reproductive output after the effects of body mass had been removed.

AB - Links between resting metabolic rate (RMR) and reproductive output have been previously sought at both inter- and intraspecific levels, but have only been found in some interspecific studies, We aimed to examine correlations between RMR measured both prior to breeding and at peak: lactation with litter size and litter mass in Mus musculus. By manipulating the litter size of some females at birth, we aimed to establish the direction of causality in any correlation between litter size and RMR. Correlations between maternal morphology and RMR, litter size and litter mass were also examined. Neither pre-breeding RMR nor mass-independent pre-breeding RMR was correlated with litter size or litter mass. RMR at peak lactation, however, was positively correlated with litter size and negatively correlated with mean pup mass. After correcting for the effects of body mass, residual peak lactation RMR was not correlated with litter size or litter mass. Body size was the major morphological variable influencing litter mass, offspring mass and asymptotic food intake. Mammary tissue mass was correlated with litter size when only the data for mice raising unmanipulated litters were used. RMR at peak lactation was significantly related to the principal component of morphology dominated by carcass mass, This study confirms the findings of previous intraspecific and some interspecific studies that found no correlation between RMR and reproductive output after the effects of body mass had been removed.

KW - energetics

KW - maximal metabolic rate

KW - sustained metabolic rate

KW - pregnancy

KW - lactation

KW - reproduction

KW - mouse

KW - REPRODUCTIVE ENERGETICS

KW - INTRASPECIFIC VARIATION

KW - PEROMYSCUS-MANICULATUS

KW - TENRECIDAE MAMMALIA

KW - LACTATING MICE

KW - BODY SIZE

KW - BIRDS

KW - INSECTIVORA

KW - BUDGETS

KW - CONSTRAINTS

M3 - Article

VL - 204

SP - 1937

EP - 1946

JO - Journal of Experimental Biology

JF - Journal of Experimental Biology

SN - 0022-0949

ER -