Article (Scientific journals)
Predicting milk mid-infrared spectra from first parity Holstein cows using a test-day mixed model with the perspective of herd management
Delhez, Pauline; Colinet, Frédéric; Vanderick, Sylvie et al.
2020In Journal of Dairy Science, 103 (7), p. 6258-6270
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Keywords :
mid-infrared spectroscopy; mixed model; milk composition; management
Abstract :
[en] The use of test-day models to model milk mid-infrared (MIR) spectra for genetic purposes has already been explored; however, little attention has been given to their use to predict milk MIR spectra for management purposes. The aim of this paper was to study the ability of a test-day mixed model to predict milk MIR spectra for management purposes. A data set containing 467,496 test-day observations from 53,781 Holstein dairy cows in first lactation was used for model building. Principal component analysis was implemented on the selected 311 MIR spectral wavenumbers to reduce the number of traits for modeling; 12 principal components (PC) were retained, explaining approximately 96% of the total spectral variation. Each of the retained PC was modeled using a single trait test-day mixed model. The model solutions were used to compute the predicted scores of each PC, followed by a back-transformation to obtain the 311 predicted MIR spectral wavenumbers. Four new data sets, containing altogether 122,032 records, were used to test the ability of the model to predict milk MIR spectra in 4 distinct scenarios with different levels of information about the cows. The average correlation between observed and predicted values of each spectral wavenumber was 0.85 for the modeling data set and ranged from 0.36 to 0.62 for the scenarios. Correlations between milk fat, protein, and lactose contents predicted from the observed spectra and from the modeled spectra ranged from 0.83 to 0.89 for the modeling set and from 0.32 to 0.73 for the scenarios. Our results demonstrated a moderate but promising ability to predict milk MIR spectra using a test-day mixed model. Current and future MIR traits prediction equations could be applied on the modeled spectra to predict all MIR traits in different situations instead of developing one test-day model separately for each trait. Modeling MIR spectra would benefit farmers for cow and herd management, for instance through prediction of future records or comparison between observed and expected wavenumbers or MIR traits for the detection of health and management problems. Potential resulting tools could be incorporated into milk recording systems.
Disciplines :
Agriculture & agronomy
Author, co-author :
Delhez, Pauline ;  Université de Liège - ULiège > Département GxABT > Modélisation et développement
Colinet, Frédéric ;  Université de Liège - ULiège > Département GxABT > Ingénierie des productions animales et nutrition
Vanderick, Sylvie  ;  Université de Liège - ULiège > Département GxABT > Ingénierie des productions animales et nutrition
Bertozzi, Carlo
Gengler, Nicolas  ;  Université de Liège - ULiège > Département GxABT > Ingénierie des productions animales et nutrition
Soyeurt, Hélène  ;  Université de Liège - ULiège > Département GxABT > Modélisation et développement
Language :
English
Title :
Predicting milk mid-infrared spectra from first parity Holstein cows using a test-day mixed model with the perspective of herd management
Publication date :
2020
Journal title :
Journal of Dairy Science
ISSN :
0022-0302
eISSN :
1525-3198
Publisher :
American Dairy Science Association, United States - Illinois
Volume :
103
Issue :
7
Pages :
6258-6270
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 06 March 2020

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