Skip to main content Accessibility help
×
×
Home

Look ahead mate selection schemes for multi-breed beef populations

  • B. Hayes (a1) (a2), R.K. Shepherd (a1) and S. Newman (a1) (a2)

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 multi-breed 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.

Copyright

Corresponding author

Present address: Victorian Institute of Animal Science, Department of Natural Resources and Environment, Attwood, Victoria, 3049, Australia E-mail: Ben.Hayes@nre.vic.gov.au

References

Hide All
Falconer, D. S. and Mackay, T. F. C. 1996. Introduction to quantitative genetics, fourth edition. Longman, England.
Hayes, B. J., Shepherd, R. K. and Newman, S. 1998. A tactical approach to improving long-term response in across-breed mating plans. Proceedings of the sixth world congress on genetics applied to livestock production, Armidale, vol. 23, pp. 439442.
Jansen, G. B. and Wilton, J. W. 1985. Selecting mating pairs with linear programming techniques. Journal of Dairy Science 68: 13021305.
Kinghorn, B. P. 1986. Mating plans for selection across breeds. Proceedings of the third world congress on genetics applied to livestock production, Lincoln, vol. 12, pp. 233244.
Kinghorn, B. P. 1998. Mate selection by groups. Journal of Dairy Science 81: 5563.
Kinghorn, B. P. and Shepherd, R. K. 1994. A tactical approach to breeding for information rich designs. Proceedings of the fifth world congress on genetics applied to livestock production, Guelph, vol. 17, pp. 225261.
Kinghorn, B. P. and Shepherd, R. K. 1999. Mate selection for the tactical implementation of breeding programs. Proceedings of the 13th conference of the Association for the Advancement of Animal Breeding and Genetics, vol. 13, pp. 130133.
Lin, C. Y. 1996. Optimization of breed composition to maximise net merit of synthetic populations. Technical note. Journal of Animal Science 74: 14771480.
Meuwissen, T. H. E. 1997. Maximising the response of selection with a predefined rate of inbreeding. Journal of Animal Science 75: 934940.
Newman, S., MacNeil, M. D., Reynolds, W. I., Knapp, B. W. and Urick, J. J. 1993. Fixed effects in the formation of a composite line of beef cattle. 1. Experimental design and reproductive performance. Journal of Animal Science 71: 20262032.
Shepherd, R. K. and Kinghorn, B. P. 1994. A deterministic multi-tier model of assortative mating following selection. Genetics, Selection, Evolution 26: 495516.
Shepherd, R. K. and Kinghorn, B. P. 1998. A tactical approach to the design of crossbreeding programs. Proceedings of the sixth world congress on genetics applied to livestock production, Armidale, vol. 25, pp. 431438.
Shepherd, R. K. and Kinghorn, B. P. 1999. Algorithms for mate selection. Proceedings of the 13th conference of the Association for the Advancement of Animal Breeding and Genetics, vol 13, pp. 126129.
Wray, N. R. and Hill, W. G. 1989. Asymptotic rates of response from index selection. Animal Production 49: 217227.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Animal Science
  • ISSN: 1357-7298
  • EISSN: 1748-748X
  • URL: /core/journals/animal-science
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed