A study of some effects of increased population density on reproduction in two inbred lines of mice : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science at Massey University of Manawatu, New Zealand

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dc.contributor.authorImber, Michael John
dc.date.accessioned2014-11-21T02:21:29Z
dc.date.available2014-11-21T02:21:29Z
dc.date.issued1965
dc.description.abstractThe Theory of Regulation of Reproductive Rate within Populations The original hypothesis considered that soeiopsychological pressure might act as a stressing stimulus in some proportion to population density, which would activate the complex hypothalamo-hypophyseal-adrenocorticalgonadal system (Selye, 1939, 1954; Harris, 1956). This proposal was based on field data reported in the literature and on the results of experiments in the laboratory with the pituitary-adrenocortical system. A relationship between reproductive endocrine function and population density was foreshadowed by Pearl and Surface (1909), who demonstrated decreased egg production by domestic fowl with increased population size even though the area per bird was kept constant. Crew and Mirskaia (1931) and Retzlaff (1938) demonstrated a similar inverse relationship between population size and reproductive performance in albino mice. These authors recognized the importance of behavioural factors in producing these effects. Retzlaff observed that socially dominant female mice gave the best reproductive performance. Selye (1939) demonstrated that stimuli evoking a response of the pituitary-adrenocortical system also suppressed the reproductive function of female rats. He postulated that the decreased reproductive activity might result from a shift in pituitary function to produce an increased amount of adrenocorticotrophin (ACTH) at the expense of the production of gonadotrophins although an actual decrease in the production of gonadotrophins was not shown. [From the Introduction]en_US
dc.identifier.urihttp://hdl.handle.net/10179/5932
dc.language.isoenen_US
dc.publisherMassey Universityen_US
dc.rightsThe Authoren_US
dc.subjectMiceen_US
dc.subjectReproductionen_US
dc.titleA study of some effects of increased population density on reproduction in two inbred lines of mice : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science at Massey University of Manawatu, New Zealanden_US
dc.typeThesisen_US
massey.contributor.authorImber, M. J. (Michael John)en_US
thesis.degree.disciplineAgricultural Scienceen_US
thesis.degree.grantorMassey Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Agricultural Science (M. Agr. Sc.)en_US
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