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Showing 1 to 20 of 38 for “"Breeding Values"”.
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Correlation of predicted breeding values across environments in the presence of selection for direct and maternal breeding values
… of sire direct and maternal predicted breeding values across environments. True and predicted direct and maternal breeding values (BV) of sires were simulated for sires evaluated independently in two different environments. Prediction error variances and covariances among direct and …
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Analysis of newborn calf body measurements and relationship of calf shape to sire breeding values for birth weight and calving ease
These studies were conducted to define calf body shape, to test for relationships between calf shape and sire expected progeny differences for birth weight (BWTEPD) and first-calf calving ease (CEEPD) and to evaluate the efficacy of calf shape as a selection criterion for reduction of calving …
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Improvement in accuracy using records lacking sire information in the animal model
… identification. Methods 1 and 2 assumed genetic values of cows missing sire identity were population and management group average, respectively. Methods 3 and 4 accounted for genetic values through producing abilities estimated as random and fixed effects, respectively. Correlations between true …
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Assessment of methane emission traits in Canadian Holstein cows
… Lastly, the potential re-ranking of estimated breeding values for the alternative methane traits was evaluated. Methane emission traits were found to be moderately heritable, and moderate to high genetic correlations between pairs of methane traits were found. Therefore, genetic selection for …
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Integrated genetic evaluation of breeding field test traits, competition traits and test status in Icelandic horses
The main goal in breeding the Icelandic horse is to produce aesthetically appealing and capable riding horses with five gaits and good spirit, suited both for leisure and competition. Selection of Icelandic breeding horses is based on breeding values calculated from the breeding field test records. …
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Mælidagalíkan fyrir íslenska kúastofninn
… one trait, three lactations at a time. Breeding values were estimated using the three models with all available data from the years 1995-2016 and for 24 additional versions of that dataset by eliminating data from the last two to eight years, quarter of a year at a time. Correlation …
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Heritability and repeatability of speed for two- and three-year- old standardbred racehorses
… for pace should be used for estimation of breeding values and for objective evaluation of an individual horse's real ability to compete against horses having similar abilities. Thus, resulting breeding values should be more accurate dnd biased to a lesser degree than if unadjusted racing …
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Genomic Selection and Genome-Wide Association Study in Populus trichocarpa and Pinus taeda
Forest tree breeding methods rank among the most efficient ways to increase productivity and quality of forests. With the advent of high-throughput genotyping technology, genome-enabled breeding has started to gain importance and may overcome some weaknesses of traditional tree breeding. Genomic …
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Breeding Design for Atlantic Cod (Gadus morhua L.)
… the development of the Icelandic family breeding program for Atlantic cod (Gadus morhua L.). The development of the base population began in the year 2003 when eggs were collected from wild brood fish from different spawning sites around Iceland. Approximately 350 viable families have …
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Genomic selection for high quality beef production
… focus on scenarios within the core nucleus breeding herd while the literature review considers the influence of crossbreeding heavily. Chapter two considered a comparison between pedigree and genomics with relationship matrices built from 10,549 and 4,940 individuals respectively. Animal …
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Genetic Parameters for Udder and Teat. Type Traits in Icelandic Cattle Breed
… teat structure and teat tip are not included in breeding value estimations. The main objective of this study was to estimate genetic parameters for udder and teat type traits of Icelandic Cattle, but also to describe the traits’ phenotypic structure, to estimate their genetic trends, and to …
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A Comparison of Phenotypic and Genomic Selection for Yield using a Nested Association Mapping Population in Dry Bean
… the annual yield genetic gain in common bean breeding. In the current study, a Nested Association Mapping (NAM) population of F4:5 recombinant inbred lines (RILs) derived from the crosses between the cultivar Ex Rico 23 and 10 founder lines that span the genetic diversity of Ontario …
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Evaluation of microsatellite markers for parentage verification in South Africa Angora goats
… for accurate selection and estimation of breeding values that in turn can improve the traits associated with fleece quality and yield. South African Angora goats are farmed under extensive breeding conditions in relatively large herds. As a result breeders make use of mating systems that …
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GENETIC PARAMETERS FOR HEAT AND SALINITY STRESS TOLERANCE IN NORTHERN GULF OF MEXICO EASTERN OYSTER, CRASSOSTREA VIRGINICA
… stress and develop reliable early predictors of breeding values for these traits.</p>
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Genetics of resistance to Haemonchus contortus infections in sheep
… of 50% Dorset, 25% Rambouillet and 25% Finnsheep breeding in fall and spring over 2 yr. After deworming, lambs that were approximately 120 d old and ewes that had weaned their lambs at 60 d and dried off were individually dosed with approximately 10,000 infective larvae. After infection, body …
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Genomic selection and quantitative trait loci mapping for Fusarium head blight resistance in wheat (Triticum aestivum L.)
… has been identified in the wheat gene pool, but breeding for it remains a challenge for several reasons, including the complex genetic control of resistance and poor adaptability of the traditional sources. In this context, molecular markers could contribute to the identification of genomic …
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The use of real-time-ultrasound to predict genetic attributes of body composition traits in live beef cattle
… MTDFREML for variance component estimation. Sire breeding values (BV) were ranked for ultrasound traits and corresponding carcass traits. Prediction accuracy for PIFAT values ranging from.5% to 13% resulted in a robust and unbiased model with a root mean square error (RMSE) of 1.43% and a …
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Genomic selection for accelerated barley breeding
… barley varieties, commercial interest in novel breeding techniques which improve efficiency is high. With a growing population and a range of evolving demands placed on crop production by a more variable climate, breeders need new methods to breed barley faster, more accurately and where …
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Quantitative Genetics of Life History Microevolution in the Cayo Santiago Rhesus Macaques (Macaca Mulatta)
… young adult fertility. Additionally, predicted breeding values are used to demonstrate homogeneity among rank levels---that observed life history differences between ranked individuals are primarily due to the nutritional and stress environment provided by social rank and not the genes …
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Impact of different strategies and levels of preferential treatment on different methods of bull dam selection
… PTA and PTA-F gave the highest average true breeding values when no bias was present, and both methods were robust to bias levels of 8 and 16% mean response, and continued to give the best results at these levels for all bias patterns studied. In general, selection on PI-3 and PTA-P gave poor …
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