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 21 for “"Pre-breeding"”.
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Utilizing maize genomics for pre-breeding insights
… the basis for marker assisted selection in breeding programs. B73 and Mo17 Nearly Isogenic Lines (NILs) were evaluated at the FACE facility for leaf damage and QTL were mapped. In Mo17 NILs, a significant leaf damage QTL was identified on chromosome 2 at ~161 Mb (AGPv3). Results show that …
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Serum micronutrient concentrations in western Canadian beef cattle at pre-breeding and pregnancy testing
… serum copper and molybdenum concentrations at pregnancy testing time in cows from 66 cow-calf herds that were enrolled in a study of factors affecting productivity in 205 herds from western Canada. A relatively small proportion of cows had serum copper and molybdenum concentrations outside of …
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Pituitary Prolactin Content of the Redwinged Blackbird at Pre-Breeding, Breeding and Post-Breeding Intervals
… phoeniceus) of this order is the subject of the present investigation. Changes in prolactin quantities of the pituitary at various stages in the reproductive cycle are the prime areas of concern. | Most of the previous experiments have involved domesticated birds or birds caught in the wild and …
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The effects of novel genetic diversity on yield and yield traits in a hybrid wheat pre-breeding programme
Hybrid breeding, where two inbred lines are crossed to create superior F1 plants, has the potential to increase yield and yield stability in wheat. However, commercialisation of hybrid wheat is limited by high production costs but could be offset by increasing the yield. Introducing new diversity …
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Seasonal Variation in Corticosterone, Stress Responses, and Physiology in the Northern Cardinal <i>Cardinalis cardinalis</i>
… during the winter with decreases in pre-breeding, and even further decreases during breeding where the lowest average concentrations were observed. In 2012-2013 we used the same banded population of cardinals to monitor seasonal changes in stress responses. Using more stringent …
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Breeding biology, mating system and population dynamics of the Lesser Spotted Woodepcker (Picoides minor) : combining empirical and model investigations
… of reproductive success and mortality. Moreover, breeding biology and behaviour were investigated in detail. My results showed a significant decrease of the reproductive success with later timing of breeding, caused by deterioration in food supply. Moreover, mate fidelity was of benefit, since …
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Assessment of farmer preferences, constraints and angro-morphological variation among Bambara groundnut (Vigna subterranea (L.) Verdc.) accessions as a basis for seed yield selection index
… the majority of local farmers. The first step in preparing such local germplasm for possible pre-breeding is to undertake a needs assessment study to find out what farmers have on their farms and what they would rather have as an improvement. After that, a pre-breeding program with appropriate …
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The Vaginal Microbiome Related to Reproductive Traits in Beef Heifers
… and fecal microbial composition throughout pregnancy. </p> <p>Heifers were exposed to an estrus synchronization period, including 12 days of artificial insemination eligibility, and subsequently exposed to bulls for a 50 day breeding season. Vaginal samples were taken at pre-breeding (n=72), …
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The Effects of Foot and Udder Scoring on Cow and Calf Performance
… for age and performance traits including pre-breeding weight (PBW), pre-breeding body condition score (PBCS), pregnancy rate, calf birthweight (BW), calf weaning weight (WW), calf adjusted weaning weight (AWW), cow body weight at weaning (CWW), weaning body condition score (WBCS), and …
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The Conservation Ecology of Rana temporaria and Bufo bufo in Leicestershire
Past and present surveys of Leicestershire farming areas showed that amphibian habitat has been reduced as land use diversities, scrubs, woodland and thorn hedge cover have decreased within the previous decade. Breeding pond surveys revealed Rana temporaria to breed in areas with no rough …
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Prediction of Fertility of Virginia Beef Heifers Using Expert Systems Technology
An expert system to predict the fertility of beef heifers was developed using the A.I. Toolkit KAPPA-PC 2.33. The knowledge base was developed from scientific literature and from a beef cattle reproduction expert. The expert system computes an evaluation age, age both at the start and end of the …
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Changes in Body Condition from Prepartum to Postpartum on Health and Reproduction in Dairy Cattle
… score, 72 Holstein-Friesian dairy cows at prepartum, compare lean, moderate, and over-conditioned categories, and relate any changes associated with the various time points with reproductive success by measuring body condition score, hematocrit, total white blood cell (WBC) differential, …
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Influence of ecosystem variability on the demography and reproductive performance of two Eudyptes penguins, Macaroni and Eastern Rockhopper Penguins, at sub-Antarctic Marion Island, 1994–2019
Penguins are among the most important avian predators in the Southern Ocean, consuming large amounts of prey. Macaroni Penguins Eudyptes chrysolophus and Eastern Rockhopper Penguins E. filholi are listed as Vulnerable due to large-scale population declines across their distributions. The aim of my …
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Seasonality and trade-offs in equatorial rufous-collared sparrows (Zonotrichia capensis)
… had peak territorial aggression scores during pre-breeding and nesting, suggesting that paternity protection and food resource defense are the primary selective forces shaping male territorial behavior. Territorial aggression responses depended on the life history stage of males, which were not …
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Post-breeding public information use in a ground-nesting songbird community
… hypothesized that Veery fledgling vocalizations present during the post-breeding season are PI cues used by Veeries and other ground-nesting songbirds (i.e., Ovenbirds [Seiurus aurocapilla]) for territory establishment in subsequent breeding seasons. Moreover, I hypothesize that ground-nesters …
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Factors Influencing Predation on Ruffed Grouse in the Appalachians
Predation accounts for the majority of ruffed grouse mortality beyond the brooding period throughout grouse range. Most studies of ruffed grouse ecology have taken place in the central portion of the species range including the Great Lakes states and southern Canada where aspen (Populus …
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Supplementation of Chromium Propionate Positively Impacts Reproductive Performance of Beef Females
… following the postpartum interval to achieve pregnancy success on time is a considerable obstacle for beef females. Chromium supplementation increases available glucose and insulin sensitivity within cells. Two experiments were conducted to investigate the effects of supplementing Chromium …
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Relationships Among Aquatic Macroinvertebrates, Endangered Waterbirds, and Macrophytes in Taro Lo'I At Hanalei National Wildlife Refuge, Kauai, Hawaii
… the feeding ecology of koloa and moorhen during pre-breeding, nesting, brood-rearing, and molting when these waterbirds require increased protein, lipids, and minerals. Taro is grown at HNWR under a sustainable yield regime in a wetland complex where loi in different classes of crop development …
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Piping plover habitat and demography following storm-induced and engineered landscape change
… growth following habitat creation. To help predict what might happen to the plover population following Hurricane Sandy, we evaluated the effects of habitat-creating events at several other locations in the range, evaluating the hypothesis that plover population sizes are habitat limited. We …
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The use of carcass traits as indicators of heifer pregnancy in Angus cattle
… measure of reproductive performance is heifer pregnancy, or the ability of heifers to conceive within the first breeding season. Heifers that fail to become pregnant in the first breeding season are often seen as an economic loss and culled from the herd. While these females may be fed out and …
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