Reciprocal Recurrent Selection in Swine: Postweaning Growth1
In: Journal of Animal Science, Jg. 53 (1981-12-01), Heft 6, S. 1446-1457
serialPeriodical
Zugriff:
Selection involving six cycles of reciprocal recurrent selection (RRS) was conducted over a period of 12 years, followed by a 4-year evaluation period. Selection in two unrelated selected strains (BSand LS) was based on an index of sow productivity for preweaning traits in the pure strains and on postweaning gain, carcass backfat thickness and yield of preferred cuts in their reciprocal cross-progeny (BSLSand LSBS). In addition, concurrent selection in two control strains (BCand LC) derived from the same base populations was based mainly on the dam's preweaning litter productivity. This study compared responses in postweaning growth traits in the BSand LS strains and in their cross-progeny with postweaning growth in the BCand LCstrains. Standardized selection differentials among parents for growth traits were generally larger when based on performance of their cross-progeny rather than on their own performance and, as expected, were far short of potential maximum based on single-trait truncation selection. Responses to selection during the selection period were estimated by the regression on generations of deviations of performance of BSand LSstrains and their cross-progeny from means for contemporary BC and LCstrains. Results for postweaning gain showed a significant positive response to RRS among cross-progeny, but a significant negative response in the parental BSand LS strains. In the evaluation phase, comparisons of heterosis effects in the selected and control strains largely supported conclusions from the selection phase. A more definitive evaluation of the effectiveness of the selection practiced must await further planned studies.
Titel: |
Reciprocal Recurrent Selection in Swine: Postweaning Growth1
|
---|---|
Autor/in / Beteiligte Person: | Bereskin, B. ; Hetzer, H. O. |
Zeitschrift: | Journal of Animal Science, Jg. 53 (1981-12-01), Heft 6, S. 1446-1457 |
Veröffentlichung: | 1981 |
Medientyp: | serialPeriodical |
ISSN: | 0021-8812 (print) ; 1525-3163 (print) |
DOI: | 10.2527/jas1982.5361446x |
Sonstiges: |
|