Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 93 for “"sexual maturity"”.
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Fat deposition in relation to sexual maturation of Japanese quail
… adipose tissue cellularity and the onset of sexual maturity were studied in Japanese quail (Coturnix coturnix japonica). In an initial experiment, body composition and sexual maturity were examined in response to photoperiodic and hormonal manipulations. Attempts were made to modify body …
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Reproductive Delay In The Female Cape Ground Squirrel (xerus Inauris)
… if other factors affected the timing of sexual maturity, and if so, which factors are the most influential. In this study, I simultaneously test the relative power of seven different social and environmental parameters at explaining the variation in the female age of sexual maturity in …
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Age and Sex Related Behavioral Changes in Mice Congenitally Infected with Toxoplasma gondii: Role of dopamine and other neurotransmitters in the genesis of behavioral changes due to congenital infection and attempted amelioration with interferon gamma
… with IFN-g had a minimal effect on behavior post sexual maturity but had a greater effect on pre sexual maturity female mice which exhibited difficulties with spatial memory, coordination and the ability to process stimuli. The results indicate the behavior alterations from IFN- g are transient. …
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Genetic analyses of growth, sexual maturation, and ova production in chickens
… and lean traits prior to 57 days of age, at sexual maturity, or 60 days after the onset of lay. When present, heterosis was general for most traits measured with the exception of those associated with adiposity which were population dependent. Modest heterosis was observed for the age of …
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Patterns of Chemosensory Behavior in a Closed Population of Wild African Elephants (Loxodonta Africana)
… emerge as elephants develop and approach sexual maturity. Older pubescent males (15-19 year olds) performed more chemosensory behaviors than younger pubescent males (10-14 year olds) and both groups of pubescent females, which supported the hypothesis that there would be an increase of …
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Selection for Body Weight in Chickens: Resource Allocations and Scaling
… hen-day normal egg production (HDP). Although sexual maturity was delayed, the effect was more pronounced in the low than high weight lines. Selection for low BW decreased WFE, WAFE and HDP. Selection for high BW resulted in lower HDP, while WFE and WAFE were generally higher. Minimum AFE, WFE …
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Resource allocation in chickens: genetic and nongenetic influences on development, growth and reproduction
… of feathers. Alternate-day feeding prior to sexual maturity reduced weights of fat depots, feathers and muscles and increased size of the gastrointestinal tract. Effects of every day, skip-one-day and skip-two-day restrictions of feed were generally similar. Chickens adapted quickly to …
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Reproductive biology and comparative growth rates of selected species of freshwater mussels (Bivalvia: Unionidae) in the New and Greenbrier Rivers, Virginia and West Virginia
… and glochidial release periods, and age at sexual maturity were described for each species. Comparisons of growth rates of C. tuberculata subpopulations from the Greenbrier River and three locations downstream of Bluestone Dam on the New River in West Virginia were also made to determine the …
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Net Addition and Long-Term Survival of Adult-Born Neurons in the Zebra Finch HVC: Why Replace When You Can Keep Them All?
… species that learns its song only once prior to sexual maturity. To test for numerical replacement in the adult zebra finch, we conducted three experiments. First, we retrogradely labeled and counted the two populations of projection neurons in HVC in birds ranging in age from 90 days, when they …
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The relationship between urinary organophosphate pesticide residues and reproductive development among boys living in the rural Western Cape
… measurements as well as non-significant lower sexual maturity ratings and testicular sizes in farm boys compared to non-farm boys from the rural Western Cape in South Africa. Methodology: This analysis included 183 out of 269 school boys residing on farms and neighbouring nonfarming areas who …
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Effects of dubbing on the production and behavior of chickens maintained in different environments from 20 to 72 weeks of age
… conditions, and (3) determined egg quality, sexual maturity, mortality, body weight and other traits of economic importance in dubbed and non-dubbed chickens. The studio involved two large flocks, each consisting of 170 Leghorn-type hybrid females and eight small flocks each composed of six …
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The Distribution and Reproduction of the Plains Spadefoot Toad, "Scaphiopus Bombifrons", in Iowa
… fat bodies were measured to determine size at sexual maturity, cycle of activity and breeding, and gonadal and fat body cycles. Findings. "S. bombifrons" was found to occur throughout the loess hills, and no longer merits threatened status. It was not found beyond the deep loess soil. Adult …
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A technology analysis of the U.S. Atlantic blue crab (Callinectes sapidus) processing industry
… crab type. The effects of sex, size, and type (sexual maturity) of crab and season on the yields of lump, top flake, bottom flake, and claw and total meat were examined. The effects of cooking time and method and storage time on meat yield was also determined. During summer, male crabs yielded …
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The palaeobiology of the non-mammalian cynodonts deduced from bone microstructure and stable isotopes
… marked decrease in growth rate with the onset of sexual maturity. The bone histology of the derived Cynognathus indicates rapid, sustained growth, whereas the bones of the contemporary Diademodon reveal a cyclical growth strategy that alternated between rapid growth during the favourable season …
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Accelerated, graft-based germplasm conservation of American chestnut (Castanea dentata) in the South
Asexual propagation through grafting is a low-tech, noninvasive method for conservation of rare American chestnut germplasm. Particularly when in situ conditions prevent trees from reaching sexual maturity, graft-propagation allows release from shade conditions and disease pressure to promote …
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Sexual Signaling in Male Vervet Monkeys (Chlorocebus Pygerythrus); Influences of Hormones, Behaviour, and Parasitism on Scrotal and Penile Skin Colouration
Male secondary sexual characteristics may convey information about the signaller. The red penis and blue scrotum of male vervet monkeys make them a good species to examine variation in signal expression. We quantified colour in vervets at Lake Nabugabo, Uganda from standardized photos. We …
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Incestuous Wharton: A consideration of the theme
… incestuous desire at the heart of human sexuality; In The Reef and Summer, Wharton toys with these scientific ideas about incest; the radically different way that Summer incorporates incestuous tension echoes Freud's more complex assumptions. In The Reef, Anna Leath upholds social order …
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Roles of sex and insulin on microvascular exchange function
… these changes were dependent on the sex and the sexual maturity of the animal.
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From brain development to reproductive axis: an integrated study of the nervous system in cartilaginous fish
… S. canicula and how this interaction relates to sexual maturity. Using extensive sampling, morphometric analyses, immunohistochemistry, and comparative approaches, several novel insights emerged. First, postnatal brain growth was characterized in two model species: the speckled skate Raja …
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A genetic analysis of reproduction in growth selected lines of chickens
… associated with physiological age, and delaying sexual maturity by feed restriction did not alter the patterns. Relaxing selection had a correlated effect on yolk synthesis and production of certain egg types. Increasing photoperiods beyond 14 hours in a 24-hour cycle did not have a consistent …
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