Reference : Genotype x environment interaction for milk yield in Holsteins using Luxembourg and Tuni...

	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Food science Life sciences : Genetics & genetic processes Life sciences : Animal production & animal husbandry
	To cite this reference:	http://hdl.handle.net/2268/25292

Title :	Genotype x environment interaction for milk yield in Holsteins using Luxembourg and Tunisian populations.
Language :	English
Author, co-author :	Hammami, Hedi [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
	Rekik, Boulbaba [>Ecole Supérieure d'Agriculture de Mateur > > Productions animales > > >]
	Soyeurt, Hélène [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
	Bastin, Catherine [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
	Stoll, Jean [> > > >]
	Gengler, Nicolas [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Publication date :	2008
Journal title :	Journal of Dairy Science
Publisher :	American Dairy Science Association
Volume :	91
Issue/season :	9
Pages :	3661-71
Audience :	International
ISSN :	0022-0302
e-ISSN :	1525-3198
City :	Champaign
Country :	IL
Keywords :	[en] Animals ; Breeding ; Cattle/genetics/physiology ; Environment ; Female ; Genetic Variation ; Genotype ; Lactation/genetics ; Luxembourg ; Male ; Milk/secretion ; Regression Analysis ; Tunisia
Abstract :	[en] Test-day (TD) milk yield records of first-lactation Holstein cows in Luxembourg and Tunisia were analyzed using within-and between-country random regression TD models. Edited data used for within-country analysis included 661,453 and 281,913 TD records in Luxembourg and Tunisia, respectively. The joint data included 730,810 TD records of 87,734 cows and 231 common sires. Both data sets covered calving years 1995 to 2006. Fourth-order Legendre polynomials for random effects and a Gibbs sampling method were used to estimate variance components of lactation curve parameters in separate and joint analyses. Genetic variances of the first 3 coefficients from Luxembourg data were 46 to 69% larger than corresponding estimates from the Tunisian data. Inversely, the Tunisian permanent environment variances for the same coefficients were 52 to 65% larger than the Luxembourg ones. Posterior mean heritabilities of 305-d milk yield and persistency, defined as estimated breeding values (EBV) at 280 days in milk-EBV at 80 days in milk, from between-country analysis were 0.42 and 0.12 and 0.19 and 0.08 in Luxembourg and Tunisia, respectively. Heritability estimates for the same traits from within-country analyses, mainly from the Tunisian data, were lower than those from the joint analysis. Genetic correlations for 305-d milk yield and persistency between countries were 0.60 and 0.36. Product moment and rank correlations between EBV of common sires for 305-d milk yield and persistency from within-country analyses were 0.38 and 0.41 and 0.27 and 0.26, respectively. Differences between genetic variances found in both countries reflect different milk production levels. Moreover, low genetic and rank correlations suggest different ranking of sires in the 2 environments, which implies the existence of a genotype x environment interaction for milk yield in Holsteins.
Funders :	FNR Luxembourg
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/25292
DOI :	10.3168/jds.2008-1147
Other URL :	http://jds.fass.org
Mentions required by the publisher for OA :	Publisher copyright and source are acknowledged

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