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 18 of 18 for “"breeding strategy"”.
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Investigating the possible change in breeding strategy of African black oystercatchers
… clutches over many of the sites within their breeding range. As African Black Oystercatchers are very territorial, co-operative polygyny was rejected as a sole cause (through observations). As eggs were found to be significantly similar (through intra-clutch egg shape comparisons) within …
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Evolution of asexuality in Daphnia pulex: Implications of mitochondrial-DNA analysis.
… constraints rather than an optimization of breeding strategy by natural selection.Dept. of Biological Sciences. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1988 .S735. Source: Dissertation Abstracts International, Volume: 49-04, Section: B, …
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Computer simulation to guide choice of breeding strategies for maker-aided multiple trait integration in maize
… expression of the value-added traits. From a breeding standpoint, MTI involves four steps: Single Event Introgression, Event Pyramiding, Trait Fixation, and Version Testing. We considered the breeding process to introgress 15 transgenic events into a target maize hybrid, incorporating 8 into …
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The nest defense and nest-destroying behaviors of house wrens
… Male defense levels were affected by their breeding strategy, as attentive males were more aggressive toward the house wren and cowbird models than non-attentive males. Attentive males discriminated among intruder species while non-attentive males did not. Lack of male attentiveness, due to …
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Skin Deep: Genetic Characterization And Prediction Of Russet Formation In ‘Honeycrisp’-Derived Apple Breeding Germplasm
… that detracts from fruit appearance and is a breeding target in many apple scion breeding programs. To-date, the understanding of the genetic basis of russet in apple has been limited to a relatively narrow set of germplasm. Additionally, no research on russet formation has been done in …
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Experimental test of the effects of supportive breeding on wild populations
Supportive breeding is currently being used in the management of threatened populations, but the effects of this management strategy remain relatively untested. The common house fly, Musca domestica, was used as a model to assess the relative effectiveness of supportive breeding strategies for …
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How does urbanisation affect the breeding performance of African Crowned Eagles (Stephanoaetus coronatus)?
… are largely missing. Here, we explore the breeding performance of the African Crowned Eagles (Stephanoaetus coronatus) across an urbanisation gradient in KwaZuluNatal, South Africa. Specifically, we explored the hypothesis that living in an urban environment allows this species, which is …
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Genetic analysis for heat tolerance in tropical maize (zea mays)
… will help the breeder to know the type of breeding strategy to employ. The general objective was to conduct genetic analysis for heat tolerance in tropical maize and the specific objectives of this research were therefore (i) To identify desirable performing genotypes under heat stress (ii) …
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Genetic analysis for heat tolerance in tropical maize (zea mays)
… will help the breeder to know the type of breeding strategy to employ. The general objective was to conduct genetic analysis for heat tolerance in tropical maize and the specific objectives of this research were therefore (i) To identify desirable performing genotypes under heat stress (ii) …
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Confirming QTL for seed yield from exotic soybean germplasm
… by intermating elite cultivars. This breeding strategy, combined with the limited N.A. genetic base, has resulted in a very narrow gene pool. Plant introductions (PI) have been used to expand the N.A. genetic base with limited success when conventional breeding methods have been used. …
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Molecular marker analysis of adult plant resistance to powdery mildew in common wheat
… resistance has been extensively used in breeding programs; however, it is ephemeral. Adult plant resistance (APR) to powdery mildew is more durable as demonstrated by the cultivar Massey, which has maintained its APR to powdery mildew since its release in 1981. To develop an efficient …
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The reproductive biology of two small southern African mammals, the spiny mouse, Acomys spinosissimus (Rodentia: Muridae) and the Eastern rock elephant-shrew, Elephantulus myurus (Macroscelidea: Macroscelididae)
… appears to be the main reason for seasonal breeding. In order to maximize fitness, it is important for an animal to be able to anticipate these seasonal changes and to trigger reproductive events at the correct time. Photoperiod is used to time reproduction in many temperate mammalian …
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Isolation of innate immune response genes, expression analysis, polymorphism identification and development of genetic markers for linkage analysis in common carp (Cyprinus carpio)
… disease resistance can be improved by selective breeding. Marker-assisted selection is a breeding strategy that can accelerate genetic gain; however, this approach requires genetic markers and a genetic linkage map. To develop molecular tools for breeding CyHV-3-resistant aquaculture stock, …
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Implications of climate change on the reproductive success of the Southern Yellow-billed Hornbill, Tockus leucomelas
… thermal tolerance. Many desert birds coincide breeding with periods of food availability triggered by rainfall during the summer season. Daily maximum air temperatures (ₘₐₓ) during the Kalahari summer season frequently reach the lower forties (°C) and recent years have been characterised by …
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Physiological and genetic investigations of iron deficiency in field peas (Pisum sativum L.).
… the information to implement an efficient breeding strategy for the long-term control of Fe deficiency chlorosis. Methods to screen field peas for tolerance to Fe deficiency were developed by utilizing both solution and pot soil cultures. Nutrient solution with a high concentration (10 mM) …
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Effects of temperature and food availability on the reproductive ecology of an arid-zone bird
… or reproduction, posing a severe threat to breeding and population dynamics. There has been a surge in research into the effects of high and increasing environmental temperature on avian ecology. However, the potential for resource availability to moderate environmental temperature effects …