Body Weight and Age Influences on Liver Weight in White-Tailed Deer (Odocoileus virginianus): Implications for Reproductive Effort

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dc.contributor.advisorWeckerly, Floyd W.
dc.contributor.authorParra, Claire A.
dc.contributor.committeeMemberGreen, M. Clay
dc.contributor.committeeMemberSimpson, Thomas R.
dc.date.accessioned2012-11-30T21:26:25Z
dc.date.available2012-11-30T21:26:25Z
dc.date.issued2012-11
dc.description.abstractThe mammalian liver is integral to homeostasis, metabolism, and reproduction. Previous research into the liver has mainly examined liver function; there have been far fewer investigations into how liver weight is coupled to body weight, age, and reproductive events like lactation. Understanding how these variables are coupled to liver weight may be useful to understanding reproductive effort as animal age. I examined the scaling relationship between body weight and liver weight and the influences of age, sex, body condition (back fat), tooth wear, and lactation on liver weight to shed insight into the reproductive effort of aging white-tailed deer. White-tailed deer (62 males, 71 females) from Kerr Wildlife Management Area, Texas, and a private ranch near Hebbronville, Texas, were measured. There was an allometric relationship between body weight and liver weight. Sex and age were predictors of liver weight at Kerr WMA and sex, back fat, and lactation were significant predictors at the private ranch. Controlling for body weight, males had heavier livers than females and age was positively related to liver weight. My findings indicate that liver weight reflects metabolic and reproductive demands and that older animals can potentially invest more effort in reproduction because of larger livers. These findings might be useful to understanding senescence and terminal investment on reproduction in older deer.
dc.description.departmentBiology
dc.formatText
dc.format.extent34 pages
dc.format.medium1 file (.pdf)
dc.identifier.citationParra, C. A. (2012). <i>Body weight and age influences on liver weight in white-tailed deer (Odocoileus virginianus): implications for reproductive effort</i> (Unpublished thesis). Texas State University-San Marcos, San Marcos, Texas.
dc.identifier.urihttps://hdl.handle.net/10877/4396
dc.language.isoen
dc.subjectReproductive effort
dc.subjectReproductive investment
dc.subjectTerminal investment
dc.subjectSenescence
dc.subjectLiver weight scalar
dc.subjectWhite-tailed deer
dc.subject.lcshWhite-tailed deer--Agingen_US
dc.subject.lcshWhite-tailed deer--Weighten_US
dc.subject.lcshLiver--Agingen_US
dc.subject.lcshWhite-tailed deer--Reproductionen_US
dc.titleBody Weight and Age Influences on Liver Weight in White-Tailed Deer (Odocoileus virginianus): Implications for Reproductive Effort
dc.typeThesis
thesis.degree.departmentBiology
thesis.degree.disciplineWildlife Ecology
thesis.degree.grantorTexas State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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