Author: Donald Franklin ButcherPublisher:
ISBN:
Category : Cattle
Languages : en
Pages : 158
Book Description
The Effect of Selection on Estimates of Genetic Parameters
Author: Donald Franklin ButcherPublisher:
ISBN:
Category : Cattle
Languages : en
Pages : 158
Book Description
Estimates of Genetic Parameters and Responses to Selection in Meat Type Poultry Populations
Author: Terry Brank KinneyPublisher:
ISBN:
Category : Heredity
Languages : en
Pages : 316
Book Description
Evolution and Selection of Quantitative Traits
Author: Bruce WalshPublisher: Oxford University Press
ISBN: 0192566644
Category : Science
Languages : en
Pages : 1504
Book Description
Quantitative traits-be they morphological or physiological characters, aspects of behavior, or genome-level features such as the amount of RNA or protein expression for a specific gene-usually show considerable variation within and among populations. Quantitative genetics, also referred to as the genetics of complex traits, is the study of such characters and is based on mathematical models of evolution in which many genes influence the trait and in which non-genetic factors may also be important. Evolution and Selection of Quantitative Traits presents a holistic treatment of the subject, showing the interplay between theory and data with extensive discussions on statistical issues relating to the estimation of the biologically relevant parameters for these models. Quantitative genetics is viewed as the bridge between complex mathematical models of trait evolution and real-world data, and the authors have clearly framed their treatment as such. This is the second volume in a planned trilogy that summarizes the modern field of quantitative genetics, informed by empirical observations from wide-ranging fields (agriculture, evolution, ecology, and human biology) as well as population genetics, statistical theory, mathematical modeling, genetics, and genomics. Whilst volume 1 (1998) dealt with the genetics of such traits, the main focus of volume 2 is on their evolution, with a special emphasis on detecting selection (ranging from the use of genomic and historical data through to ecological field data) and examining its consequences.
Studies on Effects of Parental Selection on Estimation of Genetic Parameters and Breeding Values of Metric Traits
Author: Estimation of Genetic Parameters Under Optimal and Suboptimal Environments for Body Weight in Chicken Using a Diallel Mating System
Author: Mohamed Hanafi Sayed MahmoudPublisher:
ISBN:
Category : Genetics
Languages : en
Pages : 310
Book Description
A 2 x 2 x 2N confounded diallel mating design (2 series, 2 males, N females per male per series) was used to obtain estimates of the genetic parameters in body weight traits in a noninbred population of New Hampshire chickens grown on 18% and 24% protein rations. Individual selection also was applied to evaluate the reliability of the genetic parameters obtained under each protein level. The analysis showed an extremely large contribution of series effects to the total variation in the traits which was attributed to the environmental influences from one series to the other and to the maternal environment. The component of variance due to series x male interaction was found to be small or zero under the 24% protein ration. An optimal environment may have given certain genotypes a greater opportunity to adapt to the environment. The higher estimates of the component of variance of series x female interaction for one-day body weight suggests the influence of maternal effects from one series to the other and from one dam to the other. Generally, estimates for the component of variance of male effects were higher under the 18% protein ration than under the 24% protein ration. Conversely, the component of variance of female effects showed higher values under the 24% protein ration than under 18% protein ration for most of the traits considered. ...
Levels of Selection in Evolution
Author: Laurent KellerPublisher: Princeton University Press
ISBN: 0691207011
Category : Science
Languages : en
Pages :
Book Description
Ever since the groundbreaking work of George Williams, W. D. Hamilton, and Richard Dawkins, evolutionary biologists have recognized that natural selection generally does not operate for the good of the group, but rather for the good of lower-level units such as the individual, the cell, even the gene. One of the fundamental problems of biology is: what keeps competition between these various levels of natural selection from destroying the common interests to be gained from cooperation? In this volume twelve prominent scientists explore this question, presenting a comprehensive survey of the current theoretical and empirical research in evolutionary biology. Recent studies show that at many levels of biological organization, mechanisms have evolved to prevent potential conflict in natural selection. Editor Laurent Keller's aim in this book is to bring together leading researchers from all biological disciplines to outline these potential conflicts and discuss how they are resolved. A multi-level approach of this kind allows important insights into the evolution of life, as well as bridging the long-standing conceptual chasm between molecular and organismal biologists. The chapters here follow a rigorous theoretical framework, giving the book an overall synergy that is unique to multi-authored books. The contributors, in addition to the editor, are H. Charles J. Godfray, Edward Allen Herre, Dawn M. Kitchen, Egbert Giles Leigh, Jr., Catherine M. Lessells, Richard E. Michod, Leonard Nunney, Craig Packer, Andrew Pomiankowski, H. Kern Reeve, John Maynard Smith, and Eörs Szathmáry.
The Effect of Sequential Selection on Estimates of Genetic and Phenotypic Parameters in Poultry
Author: Magnus SwalanderEstimation of Genetic and Phenotypic Parameters of Milk, Fat and Protein Yields of Holstein Cattle Under Selection
Author: Thomas Joseph LawlorPublisher:
ISBN:
Category : Cow testing
Languages : en
Pages : 168
Book Description
The Mathematical Theory of Quantitative Genetics
Author: Michael George BulmerPublisher: Clarendon Press
ISBN:
Category : Language Arts & Disciplines
Languages : en
Pages : 272
Book Description
This book emphasizes discussion of the underlying principles of the theory of quantitative genetics which provides the bridge between the observable statistical properties of a character and the gentic factors, which together with environmental factors, determine the expression of the character. "An essential reference for anyone concerned with quantitative genetics. . . . Provides the only review available of the parts of quantitative genetics relevant to evolutionary theory."--Science
Poultry Genetics, Breeding, and Biotechnology
Author: W. M. MuirPublisher: CABI
ISBN: 9780851998459
Category : Technology & Engineering
Languages : en
Pages : 724
Book Description
This comprehensive research book represents the first complete integration of current knowledge in this area. It addresses issues associated with poultry breeding particularly by examining quantitative and molecular genetics and the uses of transgenic technology. A special section covers the important area of disease resistance and transmission.