Reference : Linear and curvilinear effects of inbreeding on production traits for walloon Holstei...
Scientific journals : Article
Life sciences : Animal production & animal husbandry
Life sciences : Genetics & genetic processes
http://hdl.handle.net/2268/18147
Linear and curvilinear effects of inbreeding on production traits for walloon Holstein cows
English
Croquet, Coraline [Faculté Universitaire des Sciences Agronomiques de Gembloux - FUSAGx > > > >]
Mayeres, Patrick mailto [> > > >]
Gillon, Alain mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Hammami, Hedi mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Soyeurt, Hélène mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Vanderick, Sylvie mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Gengler, Nicolas mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
2007
Journal of Dairy Science
American Dairy Science Association
90
1
465-471
Yes (verified by ORBi)
International
0022-0302
1525-3198
Champaign
IL
[en] inbreeding depression ; curvilinear regression ; confidence interval ; genetic evaluation
[en] The nonlinear effects of inbreeding were studied by comparing linear and curvilinear regression models of phenotypic performances on inbreeding coefficients for production traits (milk, fat, and protein yields) of Holstein cows in their first lactation. Three different regression models (linear, quadratic, and cubic) were introduced separately into a single-trait, single-lactation, random regression test-day model. The significance of the different regression coefficients was studied based on a t-test after estimation of error variances and covariances associated with the different regression coefficients. All of the tested regression coefficients were significantly different from 0. The traditional regression coefficients of milk, fat, and protein yields on inbreeding were, respectively, -22.10, -1.10, and -0.72 kg for Holstein cows in their first lactation. However, the estimates of 305-d production losses for various classes of animals based on inbreeding coefficients showed that the effect of inbreeding was not a linear function of the percentage of inbreeding. The 305-d milk yield loss profiles attributable to inbreeding, obtained by the various regression models, were different. However, for inbreeding coefficients between 0 and 10%, these differences were small.
Researchers
http://hdl.handle.net/2268/18147

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