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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 29 for “"Crossbreeding"”.
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Index selection in terminal sire sheep: implications for genetic improvement in a crossbreeding system
Using terminal sires for crossbreeding is standard practice in the UK sheep industry, where over 70% of market lambs have terminal sire breeding. Thus, selection focusing on terminal sires will translate to changes in the entire industry. Consumers perceive lamb meat as fatty and demand for it has …
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Conservation genetics of traditional and commercial pig breeds, and evaluation of their crossbreeding potential for productivity improvement
… BL and W demonstrated the greatest potential for crossbreeding to increase the diversity of commercial populations. The crossing of LW x LR dams with GOS, BL and W terminal sires produced traditional crossbreds for comparison with LW sired crossbreds. Nuclear DNA diversity was assessed using a …
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Effects of selection on highly heritable traits of purebred and hybrid beef cattle
… to achieve high levels of both these traits. Crossbreeding offers two primary advantages relative to the use of only one breed: heterosis and breed complementarity. Although research has shown little effects of heterosis on carcass and beef quality attributes, crossbreeding can still be …
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Beef on dairy economic selection index
… an economic selection index for a beef on dairy crossbreeding system. In an effort to improve overall performance in the system, the index aims to increase profitability. Crossbreeding a beef bull with a dairy female aims to add value to the resulting calf entering the beef supply chain. …
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Genetic variation among Zulu sheep sub-populations of South Africa assessed by microsatellites and mitochondrial DNA (mtDNA)
… Zulu sheep is reported to be declining, due to crossbreeding with exotic breeds, especially with the Dorper and Merino sheep breeds with the aim of increasing body weight. The study used two molecular markers (microsatellites and mitochondrial DNA) to investigate the genetic diversity of Zulu …
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Genetic evaluation and selection in multibreed populations
Crossbreeding is used widely in animal production, thus theory and methods for genetic evaluation and selection are required for multibreed populations. This study developed theory for modelling genotypic means and covariances which are required to obtain genetic evaluation by best linear unbiased …
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Influencia de la raza y de la alimentación sobre el contenido y características de la grasa intramuscular del lomo de cerdo ibérico: efecto sobre parámetros determinantes de la calidad
The influence of crossbreeding (pure Iberian pigs vs crossbred with Duroc pigs) and feeding background (free rearing on acorn and pasture vs concentrates high in oleic acid and supplemented with 250 ppm of á-tocopherol and mixed concentrates) in quality parameters of raw meat (muscle l. dorsi), …
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Testing USDA Certified Organic and Non-GMO Verified Project Labeled Foods for the Presence of Genetic Modifications
… that cannot occur in nature or in traditional crossbreeding. <p>Our goal was to determine the presence or absence of GMO markers in USDA Organic Certified and in Non-GMO Project food products. We investigated only corn or soy-based products that were purchased from many types of retailers. Our …
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Dam type: maternal effects upon dam reproductive performance, calf mortality to weaning and preweaning growth parameters
… than striving for increased growth in crossbreeding programs.
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Estimation of heterotic effects on stayability in beef cattle
… be subject to higher levels of heterosis in crossbreeding programs. Therefore, heterosis should have a positive effect on the cows' ability to remain in the herd until age six. The objective was to estimate maternal and individual heterosis values for stayability. Data was obtained from the …
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Flour quality and dough stickiness of soft red winter wheat lines with and without 1B/1R translocations
… promising wheat lines have been developed by crossbreeding 1B/1R Jines with soft wheat in hopes of producing a 1B/1R soft wheat of good quality for use in soft wheat products. The purpose of this research was to determine the end use quality of flours from soft red winter wheats possessing 1B/ …
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Milk fatty acid profiles of Holstein and crossbreds of Holstein, Jersey, Normande, Montbéliarde, and Viking Red Dairy breeds in confinement and pasture-based herds
… of beneficial FA and less to unfavorable FA. Crossbreeding may be a tool to produce milk for potential markets for perceived health benefits.
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The role of energy balance in productivity, health, and fertility of first lactation Holsteins, Jerseys, and their reciprocal crosses
The Virginia Tech crossbreeding program began in the fall of 2002 by mating Holstein and Jersey foundation females to Holstein and Jersey bulls to create HH, HJ, JH, and JJ breed groups (sire breed listed first). Collection of daily dry matter intakes (DMI) began in the fall of 2005 and continued …
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Genetic Characterization of Zambian Native Cattle Breeds
… and the use of these populations for effective crossbreeding. The data suggest that though there is isolated by geographic distance and cultural differences among the tribes, two of the breeds are significantly related.
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Weak information flow challenging reproductive management decision-making along the swine reproductive value chain: three manuscripts
… use of superior genetic breeds and lines and crossbreeding to utilize heterosis are important factors for this improvement, especially in reproductive traits. Others suggest that genetic management lags other areas of management in terms of efficiency gains because results in the nucleus …
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Evaluation of terminal sire breeds for hair sheep production systems
Terminal sire crossbreeding systems which improve growth performance while maintaining parasite resistance have the potential to enhance the profitability of hair sheep enterprises. Katahdin (KT, n = 4), Suffolk (SU, n = 3), and Texel (TX, n = 3) rams were randomly mated to KT ewes over two years …
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Effects of nutritional plans and genetic groups on quantitative traits of pigs
… An alternative to improve meat quality is the crossbreeding of non-selected local pig breed, such as Piau, with improved breeds such as Duroc, Pietrain and Large White. However, growth rate and fat deposition differences in pigs indicate that genetic groups have different nutritional needs. …
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Breeding and technological innovations in dairy and beef cattle markets
… to analyze decisions such as breeding, crossbreeding, or animal replacement. Until relatively recently, every dairy and beef cattle ranch operated in relative isolation, resorting to diverse methods to improve their gene pull, such as organizing in cooperatives to test the quality of …
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Genomic selection for high quality beef production
… 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 models for multiple traits found genomics resulted in more accurate …
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Hormonal regulation of the onset of puberty in purebred and crossbred Holstein and Jersey heifers
The objective of this study was to determine the onset of puberty by using progesterone profiles and anterior pituitary gonadotropin releasing hormone (GnRH) challenges in purebred and crossbred Holstein and Jersey heifers. In experiment 1, fifty prepubertal heifers by four sire - dam …
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