|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 6 van 11 gevonden artikelen
| Titel: |
Missing Data Due to Culling of Pigs before Testing and the Effects on the Genetic Evaluation |
| Auteur: |
Appel, Lieuwe Strandberg, Erling Danell, Birgitta Lundeheim, Nils |
| Verschenen in: |
Acta agriculturae Scandinavica. Section A, Animal science |
| Paginering: | Jaargang 45 (1995) nr. 4 pagina's 218-227 |
| Jaar: |
1995-11-01 |
| Inhoud: |
The effects of culling of pigs before field performance testing was analysed using a stochastic simulation of a pig breeding unit with 100 sows and 15 boars. Ten years of data were generated for age at test (AGE) and sidefat thickness (FAT). Culling was performed at random (C-RAND), within litters (C-W/IN) or over litters (C-OVER), by deleting records according to the phenotypic value of AGE in the complete dataset. Genetic evaluations in the subsets of data were compared with the results in data with no culling (C-NO). For C-NO and C-RAND there was a good agreement between the true (TBVs) and predicted breeding values (PBVs) for both traits. In C-W/IN and C-OVER the PBVs were less favourable than the TBVs for AGE. C-OVER also showed a small effect on PBVs for FAT and on litter effects for AGE. Correlations between PBVs from models with or without a litter effect were .94 for C-NO and C-OVER, .97 for C-RAND and .98 for C-W/IN in the case of AGE, whereas for FAT they were all above .98. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 11 gevonden artikelen
| << vorige | volgende >> |