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Lactation curve model with explicit representation of perturbations as a phenotyping tool for dairy livestock precision farming

View ORCID ProfileBen Abdelkrim Ahmed, View ORCID ProfilePuillet Laurence, View ORCID ProfileGomes Pierre, View ORCID ProfileMartin Olivier
doi: https://doi.org/10.1101/661249
Ben Abdelkrim Ahmed
1UMR MoSAR, INRA, AgroParisTech, Université Paris-Saclay, 75005, Paris, France
2GABI, INRA, AgroParisTech, Université Paris-Saclay, 78350, Jouy-en-Josas, France
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  • For correspondence: ahmed.benabdelkrim@agroparistech.fr
Puillet Laurence
1UMR MoSAR, INRA, AgroParisTech, Université Paris-Saclay, 75005, Paris, France
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Gomes Pierre
1UMR MoSAR, INRA, AgroParisTech, Université Paris-Saclay, 75005, Paris, France
3NEOVIA, 56250, Saint-Nolff, France
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Martin Olivier
1UMR MoSAR, INRA, AgroParisTech, Université Paris-Saclay, 75005, Paris, France
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Abstract

Background Understanding the effects of environment on livestock provides valuable information on how farm animals express their production potential, and on their welfare. Ruminants often face perturbations that affect their performance. Evaluating the effect of these perturbations on animal performance could provide metrics to quantify how animals cope with their environment and therefore, better manage them. In dairy systems, milk production records can be used to evaluate perturbations because (1) they are easily accessible, (2) the overall dynamics throughout the lactation process have been widely described, and (3) perturbations often occur and cause milk loss. In this study, a lactation curve model with explicit representation of perturbations was developed.

Methods The perturbed lactation model is made of two components. The first one describes a theoretical unperturbed lactation curve (unperturbed lactation model), and the second describes deviations from the unperturbed lactation model. The model was fitted on 319 complete lactation data from 181 individual dairy goats allowing for the characterization of individual perturbations in terms of their starting date, intensity, and shape.

Results The fitting procedure detected a total of 2,354 perturbations with an average of 7.40 perturbations per lactation. Loss of production due to perturbations varied between 2% and 19%. Results show that the number of perturbations is not the major factor explaining the loss in milk yield over the lactation, suggesting that there are different types of animal response to challenging factors.

Conclusions By incorporating explicit representation of perturbations, the model allowed the characterization of potential milk production, deviations induced by perturbations (loss of milk), and thereby comparison between animals. These indicators are likely to be useful to move from raw data to decision support tools in dairy production.

Footnotes

  • About the Authors Ahmed Ben Abdelkrim: Conceptualization, Methodology, Visualization, Software implementation, Writing – Original draft preparation

    Laurence Puillet: Conceptualization, Data curation, Writing – review & editing Pierre Gomes: Conceptualization, Methodology, Preliminary tests

    Olivier Martin: Conceptualization, Supervision, Writing – review & editing

  • Data Availability: All relevant data are within the paper and its Supporting Information files. The data used in this paper and the R code for the Perturbed Lactation Model are accessible on the ZENODO data warehouse (https://zenodo.org/record/3241372#.XWOYxell9WY).

  • Funding: This work was funded by the “Deffilait project” (ANR; project: ANR-15-CE20-0014).

  • Competing Interests: The authors have declared that no competing interests exist.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted August 27, 2019.
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Lactation curve model with explicit representation of perturbations as a phenotyping tool for dairy livestock precision farming
Ben Abdelkrim Ahmed, Puillet Laurence, Gomes Pierre, Martin Olivier
bioRxiv 661249; doi: https://doi.org/10.1101/661249
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Lactation curve model with explicit representation of perturbations as a phenotyping tool for dairy livestock precision farming
Ben Abdelkrim Ahmed, Puillet Laurence, Gomes Pierre, Martin Olivier
bioRxiv 661249; doi: https://doi.org/10.1101/661249

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