Look ahead mate selection schemes for multi-breed beef populations

Hayes, B., Shepherd, R. K. and Newman, S. (2002) Look ahead mate selection schemes for multi-breed beef populations. Animal Science, 74 1: 13-23. doi:10.1017/S1357729800052206

Author Hayes, B.
Shepherd, R. K.
Newman, S.
Title Look ahead mate selection schemes for multi-breed beef populations
Journal name Animal Science   Check publisher's open access policy
ISSN 1357-7298
Publication date 2002-02
Sub-type Article (original research)
DOI 10.1017/S1357729800052206
Open Access Status Not yet assessed
Volume 74
Issue 1
Start page 13
End page 23
Total pages 11
Place of publication Cambridge, United Kingdom
Publisher Cambridge University Press
Language eng
Formatted abstract
Look ahead mate selection (LAMS) schemes have been proposed to improve longer-term genetic merit when both
selection and crossbreeding are important. We investigate the performance of a LAMS scheme which includes both
predicted progeny merit and predicted grandprogeny merit in a mate selection index (MSI). Simulation of a multibreed
beef population, with additive breeding values, direct and maternal breed effects and direct and maternal
heterosis was used to compare response from the LAMS scheme to mate selection on progeny merit only (PROG),
selection on estimated breeding value (EBV) followed by random mating (RAND) and a structured crossbreeding
scheme (CROSS). An additional strategy, LAMS + CO, was similar to LAMS but included a negative weighting
on the coancestry of selected animals in the MSI to reduce inbreeding. LAMS gave up to 3% greater response in
generation eight than PROG, 4·5% greater response than RAND, and 15% greater response than CROSS. Results
from LAMS + CO were very similar to LAMS but inbreeding was 11% less from LAMS + CO at generation eight.
The advantage of LAMS and LAMS + CO over PROG in later generations was hypothesized to be the result of
positive assortative mating and greater use of maternal effects. Evidence to support the hypothesis of assortative
mating was a positive significant correlation of EBVs of mates (sires and dams) in LAMS and LAMS + CO but
not in PROG. Strategies PROG, LAMS and LAMS + CO all created closed populations of animals with optimum
composite breed proportions.
Keyword Crossbreeding
Look ahead mate selection
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
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Created: Thu, 04 Aug 2016, 16:52:54 EST by Anthony Yeates on behalf of Learning and Research Services (UQ Library)