Two-Way Selection for Daily Gain and Feed Conversion in a Composite Rabbit Population
MetadataShow full item record
We conducted a two-way selection experiment in a composite rabbit population to investigate the responses to selection for postweaning ADG and feed conversion (FC). Two generations of crossing, followed by four generations of random pair matings, preceded three generations of selection. Selection was practiced within four lines: high-feed conversion (HFC), low-feed conversion (LFC), high gain (HG), and low gain (LG). Data on 1,446 rabbits from the random mating and selection generations were fitted to an animal model to estimate heritabilities of and the genetic correlation between ADG and FC. The two-trait model included rabbit and common litter random effects and line, generation, and sex fixed effects. Estimates of heritability of ADG and FC were .48 and .29, respectively, and the genetic correlation between them was -.82. Common litter environmental effects accounted for a proportion of .11 and . 13 of the phenotypic variation of the two traits, respectively. For ADG (in g/d) the regressions of mean breeding values on generation number during the selection period were 1.23 ± .12 (P < .01) in the HG line and -.86 ± .12 (P < .01) in the LG line; the regressions for FC (in g feed/g gain) were -.07 ± .01 (P < .01) in the HFC line and .03 ± .01 (P < .05) in the LFC line. Selection for ADG was effective in improving ADG and FC.
How to cite this document
Showing items related by title, author, creator and subject.
Rosa, Guilherme J. M. ; Yandell, Brian S.; Gianola, Daniel (Genetics Selection Evolution, 2002) [Artigo]The advent of molecular markers has created opportunities for a better understanding of quantitative inheritance and for developing novel strategies for genetic improvement of agricultural species, using information on ...
Cytogenetic and random amplified polymorphic DNA analysis of Leptodactylus species from rural and urban environments (Anura, Amphibia) Arruda, M. P. ; Morielle-Versute, E. (Genetics and Molecular Research, 2008) [Artigo]Cytogenetic and random amplified polymorphic DNA analyses carried out in the species Leptodactylus podicipinus, L. ocellatus, L. labyrinthicus, and L. fuscus from rural and urban habitats of the northwest region of São ...
Transferability and use of microsatellite markers for the genetic analysis of the germplasm of some Arachis section species of the genus Arachis Bravo, Juliana Pereira ; Hoshino, Andrea Akemi ; Angelici, Carla Maria Lara C.D. ; Lopes, Catalina Romero ; Gimenes, Marcos Aparecido (Genetics and Molecular Biology, 2006) [Artigo]The Arachis section is the most important of the nine sections of the genus Arachis because it includes the cultivated peanut, Arachis hypogaea. The genetic improvement of A. hypogaea using wild relatives is at an early ...