Article (Scientific journals)
Residual analysis for the identification of potential mid-infrared-derived biomarkers of heat stress in dairy cattle.
Lemal, Pauline; Grelet, Clément; Dehareng, Frédéric et al.
2025In Journal of Dairy Science, 108 (2), p. 1714 - 1729
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Keywords :
MIR traits; biomarkers; heat stress; residuals; Cattle; Milk/chemistry; Genetics
Abstract :
[en] Numerous prediction equations have been developed based on mid-infrared (MIR) spectra, and some could be potentially used as biomarkers of heat stress. However, practical experience shows that confusion can easily occur between the effect of heat stress and other effects, such as lactation stage or feeding variation over the year. On this basis, the objective of this study was to identify potential milk components predicted by MIR as biomarkers of heat stress based on a 2-step approach allowing correction for those effects. The first step consisted in the estimation of residuals from test-day random regression models on DIM to remove systematic lactation stage effects. These models also contained, among others, general (i.e., month of production) or specific (i.e., herd × test-day) fixed effects related to feeding and management. During the second step, means and variances of residuals by temperature-humidity index (THI) classes were studied. The models were applied to 611,063 records from 97,042 primiparous Holstein cows from 2015 to 2022 in the south of Belgium. The MIR-predicted milk components with the highest deviations from the mean with increasing THI were protein percentage, casein concentration, magnesium concentration, and (to a lesser extent) PUFA concentration. Concerning residual variances, the highest heteroscedasticity with THI was obtained for milk MIR MUFA, C18:1 cis-9, and citrate concentrations. Conversely, a relative homoscedasticity of variance with increasing THI was observed for several milk MIR components including protein percentage and casein concentration. Based on the criteria of the good biomarkers guidelines, milk protein percentage seems to be the most promising trait of this study, followed by Mg concentration. However, in the context of genetic evaluation, which requires variability, milk MIR MUFA, C18:1 cis-9, or citrate concentration variations, if they are heritable, could be of great interest. Finally, an increase in milk MIR citrate concentration variance could be an early warning for the detection of heat stress in the frame of DHI.
Disciplines :
Animal production & animal husbandry
Author, co-author :
Lemal, Pauline  ;  Université de Liège - ULiège > Département GxABT > Animal Sciences (AS)
Grelet, Clément ;  CRA-W - Centre Wallon de Recherches agronomiques
Dehareng, Frédéric ;  CRA-W - Centre Wallon de Recherches agronomiques
Soyeurt, Hélène  ;  Université de Liège - ULiège > Département GxABT > Modélisation et développement
Schroyen, Martine  ;  Université de Liège - ULiège > Département GxABT > Animal Sciences (AS)
Gengler, Nicolas  ;  Université de Liège - ULiège > TERRA Research Centre > Animal Sciences (AS)
Language :
English
Title :
Residual analysis for the identification of potential mid-infrared-derived biomarkers of heat stress in dairy cattle.
Publication date :
February 2025
Journal title :
Journal of Dairy Science
ISSN :
0022-0302
eISSN :
1525-3198
Publisher :
Elsevier, United States
Volume :
108
Issue :
2
Pages :
1714 - 1729
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 April 2025

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