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 34 for “"animal breeding"”.
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Concerning the Degree of Self Fertilization in Corn (Zea mays indentata) That is Obtained Under Normal Field Conditions
… so much comment among students in genetics and animal breeding has almost unconsciously become an adage to a part of their philosophy. Whatever truth or lack of it is associated with these words we admire the keenness of observation of him who wrote them. However significant the words "like …
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Genomic Prediction and Genetic Dissection of Yield-Related Traits in Soft Red Winter Wheat
… have utilized univariate models adapted from animal breeding. These models cannot directly account for genotype-by-environment interaction, and hence are often not suitable for use with lower-heritability traits assessed in multiple environments. We sought to test genomic prediction models …
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Impact of an artificial insemination programme on reproductive efficacy and the cross-breeding if indigenous South African goats with Boer goats in Vhembe District
To date, no attempt has been made to establish animal-assisted reproduction centres designed to facilitate controlled goat breeding, from which efficient oestrous synchronization and artificial insemination (AI) protocols can be administered in the communal farming areas of Vhembe district. The …
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A diversified exploration of beef cattle genetics: miRNA and beef bull fertility in beef and dairy female populations
… of many different topics in the field of animal breeding. Topics explored include analysis of micro ribonucleic acid (miRNA) expression as it relates to quantitative traits, genetic analysis of sire conception rate (SCR) in dairy cow and beef heifer populations, and the genetic correlation …
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Evaluating relationships among performance traits and body measurements in bulls from different preweaning management systems
… performance testing programs in developing sound breeding and selection programs is well established. However, the shift of the 70's to larger framed, later maturing cattle has raised questions as to proper testing procedures. Still, emphasis on visual appraisal to define these maturity patterns …
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TRANSCRIPTOME LANDSCAPE OF EARLY FOLLICULOGENESIS IN MAMMALS: UNLOCKING THE INTERPLAY MECHANISMS TO ENHANCE ART EFFICIENCY IN FERTILITY PRESERVATION
… in ART applications in clinical settings, animal breeding, and biodiversity preservation efforts for endangered species.
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Investigating the role of regulatory genes in heterosis for superior growth and biomass production in Arabidopsis thaliana
‘Heterosis’ is a term used in genetics and breeding referring to hybrid vigour or the superiority of hybrids over their parents in terms of traits such as size, growth rate, biomass, fertility, yield, nutrient content, disease resistance or tolerance to abiotic and abiotic stress. Parental plants …
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Studies on Estimation of Genetic Variances Under Nonadditive Gene Action
… in relatives. It was shown that under an animal model with additive x additive effects, sire ranking based on the expected merit of a future offspring depends on the relationship between the sire and his mate. Computer simulation was used to evaluate the methods considered in objective …
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Fitness Landscapes, Genetic Interactions, and the Fitness of Hybrids
… role in conservation policy, and in crop and animal breeding. Fitness landscapes are simple mathematical models that generate a rich variety of context-dependent genetic interactions, making them a useful tool for studying the ways in which these interactions affect hybrid fitness. In this …
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Genetic variation within the Icelandic goat breed: assessment using population data and DNA analysis
… population consisting of only about 500-600 animals kept in 45 herds. The breed is believed to have originated from Norway during the settlement of Iceland in the years 874-930 AD. Several population bottlenecks are known to have occurred and the population has at least twice declined to …
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Physiological and Molecular Consequences of Large Y Chromosome Long Arm Deletions in Mice
… in the development of methods for large scale animal breeding pre-implantation sex selection. The distortion has been linked to an intragenomic conflict between the X and Y chromosomes that impacts spermiogenesis. Since the proportion of X- and Y-bearing sperm does not differ in affected …
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Genetic polymorphism of alpha s1-casein. Feeding strategies to optimize productive performances of dairy goat with different genotype.
… and can reduce the environmental impact of animal breeding. Therefore, the aim of this study was to investigate the impact of different feeding practices on the performances of dairy goats differing in genotype at alpha s1-casein locus. Specifically, we investigated: 1) whether a different …
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Avaliação genética de características reprodutivas em rebanhos Nelore
Os principais objetivos deste trabalho foi realizar a avaliação genética de rebanhos Nelore para a característica categórica Habilidade de Permanência no Rebanho (HP) utilizando modelos lineares generalizados, com funções de ligação Probit e Logit, e Idade ao Primeiro Parto (IPP), sob modelo …
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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 adjusted …
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Análisis genético conjunto de caracteres de supervivencia y producción
… on the survival traits have increased in breeding schemes to improve the domestic species. These traits are, unlike the conven-tional production traits usually considered in animal breeding, nonlinear, with low heritability and during the last decades have required specific methodologi-cal …
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