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Four Scientific Studies On Span Of Life Related To Age Of Maturity

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Record 1 from database: MEDLINE
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Title
Adult life span as a function of age at maturity.
Author
Prothero J
Address
Department of Biological Structure, School of Medicine, University of Washington, Seattle 98195.
Source
Exp Gerontol, 1993 Nov, 28:6, 529-36
Abstract
A regression analysis was made of age at first reproduction in female mammals, as a function of body weight, using the data of Wootton. Data on maximal life span, also expressed as a function of body weight, were used to calculate "adult" life span, wherever possible, by subtracting the cognate value for age at first reproduction. Then a regression analysis of adult life span as a function of age at first reproduction was made. In both cases global regression lines (i.e., for whole data sets) were computed by standard least squares and by a robust method, as well as local regression lines for subgroups classified by taxonomic and ecological criteria. The slopes of the various regression lines were found to vary widely as a function of the method of classification. This result argues against the notion that the ratio of life history variables is a constant, or that one life history variable is likely to be a simple function of another. The results for bats are anomalous, in that age at first reproduction appears to be independent of body weight (over about two orders of magnitude). It is concluded that a full understanding of life history variables, such as maximal life span and age at maturity, is likely to depend on combined physiological, ecological, and evolutionary insights.
Language of Publication
English
Unique Identifier
94185737

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MeSH Heading (Major)
Longevity|*; Sex Maturation|*
MeSH Heading
Age Factors; Animal; Female; Regression Analysis; Reproduction

Publication Type
JOURNAL ARTICLE
ISSN
0531-5565
Country of Publication
ENGLAND

Record 2 from database: MEDLINE

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Title
Adult life span as a function of age at maturity.
Author
Prothero J
Address
Department of Biological Structure, School of Medicine, University of Washington, Seattle 98195.
Source
Exp Gerontol, 1993 Nov, 28:6, 529-36
Abstract
A regression analysis was made of age at first reproduction in female mammals, as a function of body weight, using the data of Wootton. Data on maximal life span, also expressed as a function of body weight, were used to calculate "adult" life span, wherever possible, by subtracting the cognate value for age at first reproduction. Then a regression analysis of adult life span as a function of age at first reproduction was made. In both cases global regression lines (i.e., for whole data sets) were computed by standard least squares and by a robust method, as well as local regression lines for subgroups classified by taxonomic and ecological criteria. The slopes of the various regression lines were found to vary widely as a function of the method of classification. This result argues against the notion that the ratio of life history variables is a constant, or that one life history variable is likely to be a simple function of another. The results for bats are anomalous, in that age at first reproduction appears to be independent of body weight (over about two orders of magnitude). It is concluded that a full understanding of life history variables, such as maximal life span and age at maturity, is likely to depend on combined physiological, ecological, and evolutionary insights.
Language of Publication
English
Unique Identifier
94185737

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MeSH Heading (Major)
Longevity|*; Sex Maturation|*
MeSH Heading
Age Factors; Animal; Female; Regression Analysis; Reproduction

Publication Type
JOURNAL ARTICLE
ISSN
0531-5565
Country of Publication
ENGLAND

Record 3 from database: MEDLINE

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Title
Evolution of life history variation among female mammals.
Author
Charnov EL
Address
Department of Biology, University of Utah, Salt Lake City 84112.
Source
Proc Natl Acad Sci U S A, 1991 Feb, 88:4, 1134-7
Abstract
A unified approach is developed for the evolutionary structure of mammalian life histories; it blends together three basic components (individual growth or production rate as a function of body size, natural selection on age of maturity, and stable demography) to predict both the powers and the intercepts of the scaling allometry of life history variables to adult size. The theory also predicts the signs (+, -) of the correlations between life history variables when body size is held constant. Finally, the approach allows us to eliminate body size to predict the dimensionless relationships between the life history variables themselves.
Language of Publication
English
Unique Identifier
91142126

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MeSH Heading (Major)
Evolution|*; Mammals|*PH; Variation (Genetics)|*
MeSH Heading
Animal; Female; Mathematics; Models, Genetic; Models, Statistical; Mortality

Publication Type
JOURNAL ARTICLE
ISSN
0027-8424
Country of Publication
UNITED STATES

Record 4 from database: MEDLINE
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Title
Basic neuroendocrine events before puberty in cattle, sheep and pigs.
Author
Pelletier J; Carrez Camous S; Thiery JC
Address
 
Source
J Reprod Fertil Suppl, 1981, 30:, 91-102
Abstract
Neuroendocrine events before puberty are compared in male and female cattle, sheep and pigs. The patterns of secretion of gonadotrophin, the age-related LH responses to castration or LH-RH administration and the effects of prolonged steroid treatment give information about the maturity of the hypothalamic-pituitary axis. It appears that in all three species the mechanisms involved in the expression of puberty are progressive rather than abrupt events. Some original contributions reported here, such as age-related changes in plasma levels and pulses of LH in the gilt, and the variations in pituitary cytosol receptors to 5 alpha-dihydrotestosterone and oestradiol-17 beta in the male lamb support this contention. Finally, this brief review of the neuroendocrine events known to occur before puberty in three domestic mammals underlines numerous missing links in our understanding of the prepubertal processes.
Language of Publication
English
Unique Identifier
83163915

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MeSH Heading (Major)
Cattle|*PH; Sex Maturation|*/DE; Sheep|*PH; Swine|*PH
MeSH Heading
Aging; Animal; Brain|PH; Castration; Comparative Study; Electrophysiology; Estradiol|PD; Feedback; Female; FSH|BL; Gonadorelin|PD; Hypothalamus|PH; LH|BL; Male; Neurons|PH; Pituitary Gland|PH; Prolactin|BL; Receptors, Androgen|ME; Receptors, Estrogen|ME; Testosterone|BL

Publication Type
JOURNAL ARTICLE; REVIEW
ISSN
0449-3087
Country of Publication
ENGLAND

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