Optimal size of progeny groups for progeny-testing programs by artificial insemination firms

Journal of Dairy Science
J C DekkersE B Burnside

Abstract

A semi-stochastic model for the simulation of genetic improvement in a dairy cattle population was used to evaluate and optimize progeny-testing programs for AI firms that operate in a competitive market for semen from progeny-tested bulls with regard to number of bulls sampled and size of progeny groups. The population was serviced by four firms. The competition for market share and semen sales was determined by the relative rank of progeny-tested bulls from a firm based on EBV for a trait with a heritability of 25%. For a fixed total number of daughters from young bulls for an AI program (test capacity), optimal size of the progeny groups was highly dependent on the objective to be maximized. The rate of genetic gain was maximized with a progeny group of 57 to 61 daughters per bull, but was relatively robust to changes in size of progeny groups. The number of marketable bulls was maximized with progeny groups between 20 and 40 daughters, depending on the test capacity. However, when a relationship between price per dose of semen and EBV of marketable bulls was considered, returns from semen sales were maximized at 49 and 82 daughters per bull, respectively, for linear and quadratic functions for semen price. The critical obje...Continue Reading

References

Sep 1, 1994·Journal of Dairy Science·L R Schaeffer
Jan 1, 1985·Genetics, Selection, Evolution : GSE·J Colleau

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Citations

Oct 24, 1998·Journal of Dairy Science·C N VierhoutR E Pearson
Mar 24, 2011·Journal of Dairy Science·S SchierenbeckS König
Mar 21, 2007·Journal of Dairy Science·S KönigH Simianer
Jan 18, 2005·Journal of Dairy Science·O González-RecioR Alenda
Jan 31, 2018·Genetics, Selection, Evolution : GSE·Kasper JanssenHans Komen
Apr 23, 1999·Journal of Dairy Science·C N VierhoutR E Pearson
Oct 20, 1998·Journal of Dairy Science·T H Meuwissen

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