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Potential use of mid-infrared milk spectrum in pregnancy diagnosis of dairy cows
Laine, Aurélie; Goubau, Amaury; Dale, Laura-Monica et al.
2013In Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science
Peer reviewed
 

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Keywords :
milk MIR spectrum; pregnancy diagnosis; dairy cow
Abstract :
[en] Fertility issues are a large part of economic losses for the dairy farmers. Early identification of pregnant and non-pregnant cows is a key element to improve reproductive performances and reduce costs for the farmer. The mid-infrared (MIR) spectrum obtained from milk recording routines is an inexpensive and quick method to obtain a fingerprint of the milk composition. This study was conducted in the context of the European project OptiMIR (INTERREG IVB North West Europe Program). The objective was to investigate the potential use of the entire milk spectrum to identify if a cow is pregnant or not. Investigation was based on 7,840 spectral records linked to confirmed pregnancy status coming from Luxembourg milk recording. The method was based on comparing a given spectrum to the expected spectrum if the cow would have been non-pregnant. The expected spectra were obtained from solutions of a mixed model (fixed effects: parity, herd, milking moment and days in milk; random effects: animal across lactations) applied to MIR spectra from a subset of non-pregnant cow. Therefore the solutions obtained in the model were used on the whole dataset to obtain predicted MIR spectral values for all test-days and prediction errors (residuals) representing the factors not present in the model (reproductive status, unaccounted factors, and error). A predictive quadratic discriminant function was then constructed on the residual spectra to predict the pregnancy status. Leave one out cross-validation showed promising results with an error rate equal to 1.8% and 6.8% for non-pregnant cow and for pregnant cow respectively. Results have shown that MIR milk spectra might be used as a pregnancy diagnosis tool. Therefore, this kind of diagnosis could be made routinely and at a low cost for farmers.
Disciplines :
Animal production & animal husbandry
Author, co-author :
Laine, Aurélie ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Goubau, Amaury;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Dale, Laura-Monica ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Bel Mabrouk, Hana ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Hammami, Hedi ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Gengler, Nicolas  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Language :
English
Title :
Potential use of mid-infrared milk spectrum in pregnancy diagnosis of dairy cows
Publication date :
28 August 2013
Event name :
64th Annual Meeting of the European Federation of Animal Science
Event organizer :
EAAP - European Federation of Animal Science
Event place :
Nantes, France
Event date :
26-30 August 2013
Audience :
International
Main work title :
Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science
Publisher :
Wageningen Academic Publishers, Wageningen, Netherlands
Edition :
Nantes 2013
ISBN/EAN :
978-90-8686-228-3
Collection name :
Nº. 19
Pages :
523
Peer reviewed :
Peer reviewed
Name of the research project :
OptiMIR (INTERREG IVB North West Europe Program)
Available on ORBi :
since 03 October 2013

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