Dorothée Ledoux

Dorothée Ledoux
VetAgro Sup

About

19
Publications
1,862
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73
Citations
Citations since 2017
7 Research Items
53 Citations
2017201820192020202120222023051015
2017201820192020202120222023051015
2017201820192020202120222023051015
2017201820192020202120222023051015
Introduction
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Publications

Publications (19)
Article
Full-text available
Cattle suffering from inflammatory infection display sickness and pain-related behaviours. As these behaviours may be transient and last only a few hours, one may miss them. The aim of this study was to assess the benefit of combining continuous monitoring of cow behaviour via collar-attached accelerometers with direct visual observations to detect...
Article
Full-text available
We collected data on the behaviour of dairy cows in barns, clinical signs of diseases as well as events that may stress or agitate the cows. A Real-Time Locating System gives the position of individual cows every second. The position of the cow is determined by triangulation based on radio waves emitted by a tag fixed on each cow neck collar and ca...
Article
Disease and stress can disrupt the circadian rhythm of activity in animals. Sensor technologies can automatically detect variations in daily activity, but it remains difficult to detect exactly when the circadian rhythm disruption starts. Here we report a mathematical Fourier-Based Approximation with Thresholding (FBAT) method designed to detect ch...
Article
Full-text available
Les techniques d'élevage de précision ont été développées essentiellement pour augmenter la rentabilité et réduire la charge de travail en appliquant des processus automatiques de surveillance des animaux et de leur environnement. Par exemple la détection de l'œstrus permet une insémination rapide, tandis que la détection des boiteries à un stade p...
Article
Cet article fait le point sur les relations entre le bien-être animal en élevage et les performances de reproduction des bovins. Si l’amélioration du bien-être de ces derniers répond à des attentes sociétales fortes, elle a également un objectif technique pour l’éleveur puisqu’une augmentation des performances de reproduction peut en résulter. Le v...
Article
Cet article fait lepoint sur l’influencedes pratiques de lareproduction sur lebien-être en élevage.Ce dernier est définipar quatre grandsprincipes : bonnealimentation, bonnesanté, bon logementet comportementapproprié. Dela fécondationau sevrage, lesdifférentes pratiquesde reproduction ontun impact positif ounégatif sur le bienêtredes animaux.Le vét...
Article
Full-text available
We investigated the effect of maternal sire on early pregnancy failure (between D0, day of insemination and D90) in their progeny during the first and second lactations ( n =3508) in the Holstein breed. The estimated breeding value (EBV) for cow fertility of 12 bulls (reliability⩾0.95) was used to create the following three groups: low, medium and...
Article
Currently, in France and the United States of America, only 30-35 % of first artificial inseminations in Holstein cows result in a calving. Pregnancy failure mainly occurs during embryonic development (fertilization failure - early embryonic mortality (FF-EEM) between D0 and D16 or late embryonic mortality (LEM) between D16 and D45 after inseminati...
Article
Full-text available
Twice weekly blood progesterone analysis was used to monitor resumption of ovarian cyclicity in 239 postpartum periods of 144 Holstein cows in one herd between D7 and D70 postpartum (PP). Calving season, low milk production and low BCS were risk factors for delayed cyclicity (DC: 16.3%). Retained placenta and metritis, early ovulation after calving...
Article
Reliable detection of Coxiella burnetii shedders is a critical point for the control of the spread of the infection between animals and from animals to humans. PCR is the most suitable tool for the detection of Coxiella burnetii in cattle. In routine diagnosis, the samples are usually sent to laboratories by postal routing. This study aimed at asse...
Book
The aim of this study was to identify herd-level factors associated with the presence of cows infected by Mycobacterium avium subspecies paratuberculosis (Map) in dairy herds. Farm-management data were collected in 192 dairy herds located in western France according to a specific questionnaire administered during a farm visit from April to July 200...

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