Year: 1992
Type: dissertation
Abstract: Chapter 1. Introduction.Estimates of genetic parameters 5 Maternal effects 13 Genotype environment interactions 15 Chapter 2. Univariate individual animal model estimates of 17 genetic parameters for performance test traits of Landrace and Large White pigs tested in a commercial nucleus herd.Chapter 3. The genetic relationship between sexes for performance traits of Landrace and Large White pigs as recorded in a commercial nucleus herd.Introduction Material and methods Results Discussion Summary and conclusions Chapter 4. Bivariate estimation of genetic parameters for 91 performance test traits of Landrace pigs tested in a commercial nucleus herd.Introduction 91 Material and methods Data and population structure Analyses performed Results Analyses containing common litter of birth effect Genetic correlations, rg Common litter of birth correlations, r c Phenotypic and residual correlations, r and 101 r0 Analyses omitting common litter of birth effect 101 Discussion Changes in correlations across Test Management Groups Differences in correlations between analyses under alternative random effect models Summary and conclusions Chapter 5. Univariate genetic parameter estimates for reproduction traits in purebred Landrace and Large White pigs.Comparison of different random effect models Results Landrace data Fixed effect assessment Correction of PWt and LWt for total number born Comparison of different random effect models Large White data Discussion Fixed effect assessment Correction of PWt and LWt for total number born Comparison of different random effect models Comparison of Large White and Landrace analyses Summary and conclusions Chapter 6.Individual Animal Model estimation of the genetic correlations between performance test and reproduction traits as recorded in a commercial Landrace population.
Source: ERA
Author: R. E. Crump
Language: English
Subfield: Genetics
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2274782248