Reference : Genetic parameters of saturated and monounsaturated fatty acids estimated by test-day...
Scientific congresses and symposiums : Paper published in a journal
Life sciences : Food science
Life sciences : Genetics & genetic processes
Life sciences : Animal production & animal husbandry
http://hdl.handle.net/2268/24970
Genetic parameters of saturated and monounsaturated fatty acids estimated by test-day model in Walloon dairy cattle
English
Soyeurt, Hélène [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Bastin, Catherine []
Dardenne, Pierre [Centre Wallon de Recherches agronomiques > Qualité des productions agricoles > > >]
Dehareng, Frédéric [Centre Wallon de Recherches agronomiques > Qualité des productions agricoles > > >]
Gengler, Nicolas [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
7-Jul-2008
Journal of Dairy Science
American Dairy Science Association
86/91
E-Suppl. 2/ E-Suppl. 1
J. Anim. Sci. Vol. 86, E-Suppl. 2/J. Dairy Sci. Vol. 91, E-Suppl. 1
542
Yes (verified by ORBi)
No
International
0022-0302
1525-3198
Champaign
IL
2008 Joint ADSA-ASAS Annual Meeting
7-11 July 2008
ADSA - ASAS
Indianapolis
USA
[en] Fatty Acid ; Genetic Parameter ; Dairy Cattle
[en] The contents of saturated (SAT) and monounsaturated (MONO) fatty acids in milk vary through the lactation. The aim of this research was to estimate the genetic parameters for these groups of fatty acids in bovine milk using multi-trait random regression test-day models. The relationship between these fatty acids and the milk production traits was also studied as well as the effects of season and stage of lactation. The model included as fixed effects: herd x date of test, class of 15 days in milk, class of age. Random effects were herd x year of calving, permanent environmental, additive genetic, and residual effects. Since October 2007, all spectra generated by milk recording in the Walloon part of Belgium were collected. The contents of SAT and MONO were estimated by mid-infrared spectrometry. First results were obtained from 100,841 test-day records from 11,626 Holstein heifers. The season and stage of lactation influenced the contents of SAT and MONO in milk and milk fat. The heritability estimates of SAT and MONO in fat were higher at the beginning of the lactation. The negative energy balance of cows could explain this variation. The values of heritability were also higher at the end of lactation. The genetic and phenotypic correlations among studied traits varied also through the lactation. This study confirms the genetic variability of fatty acids and suggests a possible relation between the contents of SAT and MONO in milk fat and the energy balance of cows
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/24970
http://www.jtmtg.org/JAM/2008/abstracts/toc.htm

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