ORBi: Colinet Frédéric - Mid-infrared prediction of milk titratable acidity and its genetic variability in first-parity cows

Reference : Mid-infrared prediction of milk titratable acidity and its genetic variability in first-...


	Document type :	Scientific congresses and symposiums : Paper published in a book
	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/2268/129986

Title :	Mid-infrared prediction of milk titratable acidity and its genetic variability in first-parity cows
Language :	English
Author, co-author :	Colinet, Frédéric [Université de Liège - ULg > Sciences agronomiques > Zootechnie >]
	Vanlierde, Amélie [Université de Liège - ULg > Sciences Agronomiques > Zootechnie > 2e an. master bioingé. : sc. agrono., fin. spéc. >]
	Vanden Bossche, sandrine [Université de Liège - ULg > Chimie et bio-industries > Laboratoire Qualité et sécurité des produits agro-aliment. >]
	Sindic, Marianne [Université de Liège - ULg > Chimie et bio-industries > Laboratoire Qualité et sécurité des produits agro-aliment. >]
	Dehareng, Frédéric [Centre wallon des Recherches agronomiques > Département Valorisation des Productions Agricoles > > >]
	Sinnaeve, Georges [Centre wallon des Recherches agronomiques > Département Valorisation des Productions Agricoles > > >]
	Vandenplas, Jérémie [Université de Liège - ULg > Sciences agronomiques > Zootechnie >]
	Soyeurt, Hélène [Université de Liège - ULg > Sciences agronomiques > Zootechnie >]
	Bastin, Catherine [Université de Liège - ULg > Sciences agronomiques > Zootechnie >]
	Gengler, Nicolas [Université de Liège - ULg > Sciences agronomiques > Zootechnie >]
Publication date :	Aug-2012
Main document title :	Book of Abstracts of the 63rd Annual Meeting of the European Federation of Animal Science
Publisher :	Wageningen Academic Publishers
Collection and collection volume :	Book of abstracts No. 18
Pages :	17
Peer reviewed :	No
On invitation :	No
Audience :	International
ISBN :	978-90-8686-206-1
City :	Wageningen
Country :	The Netherlands
Event name :	63rd Annual Meeting of the European Association for Animal Production
Event date :	du 27 août 2012 au 30 août 2012
Event organizer :	European Association for Animal Production
Event place (city) :	Bratislava
Event country :	Slovakia
Keywords :	[en] Titratable acidity ; milk ; prediction ; holstein ; Mid Infrared
Abstract :	[en] Coagulation of milkhas a direct effect on cheese yield. Among several parameters, titratable acidity of milk (TA) influences all the phases of milk coagulation. In order to study the genetic variability of this trait on a large scale, mid-infrared (MIR) chemometric methods were used to predict TA. A total of 507 milk samples collected in the Walloon Region of Belgium from individual cows were analyzed using a MIR spectrometer. TA was recorded as Dornic degree. An equation to predict TA from milk MIR spectrum was developed using partial least squared regression after a first derivative pre-treatment applied to the spectra to correct the baseline drift. During the calibration process, 45 outliers were detected and removed from the calibration set. The TA mean of the final calibration set was 16.62 (standard deviation (SD) = 1.80). The coefficient of determination (R²) was 0.82 for the calibration with a standard error (SE) of 0.76. A cross-validation (cv) was performed (R²cv = 0.81 with SEcv = 0.80). This equation was then applied on the spectral database generated during the Walloon routine milk recording. The variances components were estimated by REML using single-trait random regression animal test-day model. The dataset used included 33,717 records from 9,191 Holstein first-parity cows; the TA mean was 17.05 (SD = 1.35) and TA ranged from 12.83 to 20.87. Estimated daily heritabilities ranged from 0.43 at 5th day in milk to 0.59 at 215th day in milk indicating potential of selection. Further research will study phenotypic and genetic correlations between TA and milk production traits.
Research units :	EPAN - GAA
Funders :	Fonds Européen de Développement Régional - FEDER ; Région wallonne : Direction Générale opérationnelle de l'Agriculture, des Ressources Naturelles et de l'Environnement - DGARNE
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/129986
Other URL :	http://www.wageningenacademic.com/_clientFiles/download/Eaap2012-e.pdf

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