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See detailStrategies to combine novel traits across countries: example of heat stress
Hammami, Hedi ULg; Vandenplas, Jérémie ULg; Carabaño, Maria Jesus et al

Conference (2014, May 21)

Nowadays, novel traits are of great interest. However, phenotypes are siloed and mainly not shared. Heat stress is becoming problematic affecting animals’ performances and their well-being. Heat stress ... [more ▼]

Nowadays, novel traits are of great interest. However, phenotypes are siloed and mainly not shared. Heat stress is becoming problematic affecting animals’ performances and their well-being. Heat stress tolerance as a novel trait is only addressed by isolated within-country research studies. Integration and combination of local and foreign information sources is needed for better accuracy genetic evaluations. Therefore, this study was aimed to test the potential combination of sources of external information towards the evaluation of heat stress tolerance of dairy cattle. Long-term cow performances linked to environmental descriptors (weather parameters as proxy to climate change) collected over 10 years under the temperate conditions of the Walloon Region of Belgium and the hotter and warm Mediterranean conditions of Andalusia and Castile-La-Mancha Spanish regions were available. A total of 1,604,775 milk, fat, and protein test-day (TD) records linked to average daily temperature humidity (THI) values for 3-day lag before each TD were considered. Under a first strategy considering free-access to raw-data (phenotype and pedigree), a joint evaluation was firstly run using reaction norm models where production traits were considered as function of THI. A Belgian and a Spanish evaluation were also run using the same model. An alternative strategy considering only access to external information (i.e. regression coefficients for additive genetic effects (â and their associated REL)) was tested. In this case, foreign â and their REL resulting from the Spanish evaluation were first converted to the Belgian trait and thereafter integrated in the Belgian evaluation using a Bayesian approach. Rank correlations between regression coefficients, â (of the 1,104 bulls having daughters only in Spain) estimated by Belgian evaluation and â estimated by the joint evaluation were moderate (<=0.70). Corresponding rank correlations between â estimated by joint and Bayesian evaluations were significantly higher (ranging from 0.967 to 0.998), indicating that the Bayesian evaluation integrating external information was in good concordance with the joint evaluation. Results from this study indicated that the integration of external information via the Bayesian approach has a good potential to improve the genetic evaluation of sparse and siloed novel traits. [less ▲]

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See detailEstimating daily yield and content of major fatty acids from single milking
Arnould, Valérie ULg; Reding, Romain; Delvaux, Charles et al

Poster (2014, February 07)

Reducing the frequency of milk recording and the number of recorded samples per test-day could be a solution in order to reduce costs of official milk recording. However, fewer samples lead to a decrease ... [more ▼]

Reducing the frequency of milk recording and the number of recorded samples per test-day could be a solution in order to reduce costs of official milk recording. However, fewer samples lead to a decrease in the accuracy of predicted daily yields. Unfortunately, the current published equations use the milking interval that is often not available and/or reliable in practice. The first objective of this study was to propose models using easily available traits. Therefore the milking interval was replaced by a combination of data easily recorded by milk recording. The second objective of this study was to enlarge the previous investigations to milk fatty acids (FA) in order to propose a practical method for estimating accurate daily milk, fat and major FA yields from single milking. The fit goodness of proposed models was evaluated based on the correlation values between the estimated and observed daily yields in addition to the calculation of the mean square error. Obtained results are promising. Correlation values were comprised between 96.4% and 97.6% when daily yield were estimated from morning milking, and from 96.9% to 98.3% when daily yield were estimated from evening milking. The combination of records related to lactation stage, month of test, milk yield, and fat could replace the milking interval effect. Because of their simplicity, proposed models would be easy to implement. [less ▲]

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See detailStrategies to combine novel traits across countries: example of heat stress
Hammami, Hedi ULg; Vandenplas, Jérémie ULg; Carabaño, Maria Jesus et al

in Interbull Bulletin (2014), 48

Nowadays, novel traits are of great interest. However, phenotypes are siloed and mainly not shared. Heat stress is becoming problematic affecting animals’ performances and their well-being. Heat stress ... [more ▼]

Nowadays, novel traits are of great interest. However, phenotypes are siloed and mainly not shared. Heat stress is becoming problematic affecting animals’ performances and their well-being. Heat stress tolerance as a novel trait is only addressed by isolated within-country research studies. Integration and combination of local and foreign information sources is needed for better accuracy genetic evaluations. Therefore, this study was aimed to test the potential combination of sources of external information towards the evaluation of heat stress tolerance of dairy cattle. Long-term cow performances linked to environmental descriptors (weather parameters as proxy to climate change) collected over 10 years under the temperate conditions of the Walloon Region of Belgium and the hotter and warm Mediterranean conditions of Andalusia and Castile-La-Mancha Spanish regions were available. A total of 1,604,775 milk, fat, and protein test-day (TD) records linked to average daily temperature humidity (THI) values for 3-day lag before each TD were considered. Under a first strategy considering free-access to raw-data (phenotype and pedigree), a joint evaluation was firstly run using reaction norm models where production traits were considered as function of THI. A Belgian and a Spanish evaluation were also run using the same model. An alternative strategy considering only access to external information (i.e. regression coefficients for additive genetic effects (â and their associated REL)) was tested. In this case, foreign â and their REL resulting from the Spanish evaluation were first converted to the Belgian trait and thereafter integrated in the Belgian evaluation using a Bayesian approach. Rank correlations between regression coefficients, â (of the 1,104 bulls having daughters only in Spain) estimated by Belgian evaluation and â estimated by the joint evaluation were moderate (<=0.70). Corresponding rank correlations between â estimated by joint and Bayesian evaluations were significantly higher (ranging from 0.967 to 0.998), indicating that the Bayesian evaluation integrating external information was in good concordance with the joint evaluation. Results from this study indicated that the integration of external information via the Bayesian approach has a good potential to improve the genetic evaluation of sparse and siloed novel traits. [less ▲]

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See detailAnalyse de l'efficience des traitements de mammites de 50 fermes de Wallonie dans la base LAECEA
Theron, Léonard ULg; Reding, Edouard; Detilleux, Johann ULg et al

Conference (2013, October 11)

Mastitis is the most “antibiotic consuming” pathology in dairy medicine. Though antibiotics and antibiograms are known to vets since the early fifties, our practices did not evolved a lot from empiric ... [more ▼]

Mastitis is the most “antibiotic consuming” pathology in dairy medicine. Though antibiotics and antibiograms are known to vets since the early fifties, our practices did not evolved a lot from empiric antibiotic therapy. Indeed, the need for a treatment, the cost and the delay for an antibiogram are most of the time incoherent with a routine practice. Nevertheless, there is a surge for rational use of antibiotics. Our study was based on 1100 mastitis events from 30 Belgian farms collected between January 2011 and June 2012. We chose to compare tissular cure (TC) based on the threshold of 200.000 somatic cells/ml in milk at milk control at least 60 days after the clinical mastitis event. Regarding the mastitis event, severity (according 3 grades: alteration of milk as grade 1, alteration of quarter as grade 2 and alteration of general state as grade 3), quarter, treatments were recorded. We also assessed a chronicity status based on previous somatic cell count (SCC) of the cow. It was considered a new case a cow which at least 15 days before had an SCC <200.000 cells/ml, other were marked as chronic cases. In our distribution, we see a seasonal rise of incidence between January and May. This period would represent twice as many mastitis as the summer period. Overall TC reaches 46% of all mastitis events, which is quite poor. Rear quarters had significantly lower TC (p<0,05%). Grade 3 mastitis had lower TC, 42,6% (p<0.05%) versus 48,9 % for grade 2 and 44,2% for grade 1. Almost 49% of all mastitis was considered as chronic cases, which TC was 33% on average, whereas new cases reached 55,3% TC. Study of treatment was frustrating given the high number of different combinations of treatments. It was underlined that 4th generation cephalosporins (C4G) were the most used in our cohort, followed by aminopenicillin/methicillin association (PENA/PENM) and 1st generation cephalosporins/aminoglycosids (C1G/AG) association. Of these intramammary treatments, 20% of the cases were submitted to a second intramammary drug, mostly C1G or C1G/AG. One third of the cases were treated parenterally with antimicrobials, mostly macrolids, fluoroquinolones and penethacillin. Finally, 10% of mastitis was treated with anti-inflammatory drugs, mostly tolfenamic acid and flunixin-meglumin. Comparing mastitis without use of a secondary intramammary drug, only PENA and C1G/AG reached more than 60% TC. Considering new cases, then C1G/AG, PENA/PENM and Prednisolone containing specialties were above 60% TC. Use of a parenteral injections increased TC only on new cases (+12%), but not on chronic cases. Refining by severity, TC improved with a parenteral on new cases, mainly in grade 1 (+20%). Regarding associated factors, TC was negatively affected by chronicity, parity and lactation stage. Indeed, TC was lower on cases from more than 4 month in milk, third lactation (OR = 2.8 for no cure) compared with previous, and chronic cases (OR=2,6). Seemingly, chronicity was positively associated with parity and season. The 3rd parity cases had higher chances to be chronic ones (OR = 1,7), as well as cases from April to September (OR = 1,6). This evaluation of cure is rather simple and has a good variability which allows several questions about the real match between antimicrobial treatment for mastitis and the udder inflammation. Based on our epidemiological data, we can modify routine management of mastitis, as some cases might not worth the antimicrobial treatment. [less ▲]

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See detailGetting insights on bovine mastitis treatment efficacy based on tissular indicators with an integrated udder health management file: Project LAECEA.
Theron, Léonard ULg; Reding, Edouard; Rao, Anne-Sophie ULg et al

Poster (2013, August)

Mastitis is the most “antibiotic consuming” pathology in dairy medicine. Though antibiotics and antibiograms are known to vets since the early fifties, our practices did not evolved a lot from empiric ... [more ▼]

Mastitis is the most “antibiotic consuming” pathology in dairy medicine. Though antibiotics and antibiograms are known to vets since the early fifties, our practices did not evolved a lot from empiric antibiotic therapy. Indeed, the need for a treatment, the cost and the delay for an antibiogram are most of the time incoherent with a routine practice. Nevertheless, there is a surge for rational use of antibiotics. Our study was based on 1100 mastitis events from 30 Belgian farms collected between January 2011 and June 2012. We chose to compare tissular cure (TC) based on the threshold of 200.000 somatic cells/ml in milk at milk control at least 60 days after the clinical mastitis event. Regarding the mastitis event, severity (according 3 grades: alteration of milk as grade 1, alteration of quarter as grade 2 and alteration of general state as grade 3), quarter, treatments were recorded. We also assessed a chronicity status based on previous somatic cell count (SCC) of the cow. It was considered a new case a cow which at least 15 days before had an SCC <200.000 cells/ml, other were marked as chronic cases. In our distribution, we see a seasonal rise of incidence between January and May. This period would represent twice as many mastitis as the summer period. Overall TC reaches 46% of all mastitis events, which is quite poor. Rear quarters had significantly lower TC (p<0,05%). Grade 3 mastitis had lower TC, 42,6% (p<0.05%) versus 48,9 % for grade 2 and 44,2% for grade 1. Almost 49% of all mastitis was considered as chronic cases, which TC was 33% on average, whereas new cases reached 55,3% TC. Study of treatment was frustrating given the high number of different combinations of treatments. It was underlined that 4th generation cephalosporins (C4G) were the most used in our cohort, followed by aminopenicillin/methicillin association (PENA/PENM) and 1st generation cephalosporins/aminoglycosids (C1G/AG) association. Of these intramammary treatments, 20% of the cases were submitted to a second intramammary drug, mostly C1G or C1G/AG. One third of the cases were treated parenterally with antimicrobials, mostly macrolids, fluoroquinolones and penethacillin. Finally, 10% of mastitis was treated with anti-inflammatory drugs, mostly tolfenamic acid and flunixin-meglumin. Comparing mastitis without use of a secondary intramammary drug, only PENA and C1G/AG reached more than 60% TC. Considering new cases, then C1G/AG, PENA/PENM and Prednisolone containing specialties were above 60% TC. Use of a parenteral injections increased TC only on new cases (+12%), but not on chronic cases. Refining by severity, TC improved with a parenteral on new cases, mainly in grade 1 (+20%). Regarding associated factors, TC was negatively affected by chronicity, parity and lactation stage. Indeed, TC was lower on cases from more than 4 month in milk, third lactation (OR = 2.8 for no cure) compared with previous, and chronic cases (OR=2,6). Seemingly, chronicity was positively associated with parity and season. The 3rd parity cases had higher chances to be chronic ones (OR = 1,7), as well as cases from April to September (OR = 1,6). This evaluation of cure is rather simple and has a good variability which allows several questions about the real match between antimicrobial treatment for mastitis and the udder inflammation. Based on our epidemiological data, we can modify routine management of mastitis, as some cases might not worth the antimicrobial treatment. [less ▲]

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See detailDevelopment of a genomic evaluation for milk production for a local bovine breed
Colinet, Frédéric ULg; Vandenplas, Jérémie ULg; Faux, Pierre ULg et al

in Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science (2013, August)

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See detailAnalyse de l'efficience des traitements de mammites de 60 fermes de Wallonie dans la base LAECEA
Theron, Léonard ULg; Reding, Edouard; Detilleux, Johann ULg et al

in Brard, Christophe (Ed.) Recueil des Journées Nationale des GTV (2013)

Le traitement de la mammite bovine est un acte à part dans la routine d’une exploitation bovine. En effet, si les cas les plus graves sont vus presque systématiquement pas le vétérinaire traitant en ... [more ▼]

Le traitement de la mammite bovine est un acte à part dans la routine d’une exploitation bovine. En effet, si les cas les plus graves sont vus presque systématiquement pas le vétérinaire traitant en France ou en Belgique, la plupart des cas peu sévères font l’objet d’une tacite délégation de diagnostic et de traitement, sur base d’une formation préalable et d’une prescription enregistrée. Aujourd’hui, cette pathologie représente le plus important poste de consommation d’antibiotiques en exploitation laitière. Concernant cette problématique, la profession vétérinaire doit disposer de nouveaux outils de diagnostic, de traitement, et surtout d’évaluation de la qualité du traitement. Or, depuis la fin des années 1940, la pratique de l’antibiothérapie est restée, comme en médecine humaine, basée essentiellement sur l’antibiothérapie empirique, plus ou moins régulée par des cultures bactériologiques et des antibiogrammes (Durel et al., 2012). La profession s’est dotée d’outils d’analyse épidémiologique et clinique au cours des décennies, mais les résultats sont mitigés : une diminution globale de la consommation d’antibiotiques, mais le recours accru à des classes de dernières générations. Aujourd’hui le grand enjeu de l’antibiothérapie se corse, avec l’identification de mécanisme de résistance suspects d’être communs avec la médecine humaine(Jaglic et al., 2010). Plusieurs classes de molécules communes avec la médecine humaine sont identifiées, et leur utilisation menace d’être régulée (Bagcigil et al., 2007). Face à ce constat, l’utilisation des antibiotiques destinés au traitement de la mamelle a été étudiée en Belgique, dans soixante fermes laitières wallonnes (Théron et al., 2011). [less ▲]

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See detailTraitement de la mammite bovine - Actualité 2012
Theron, Léonard ULg; Reding, Edouard; Bertozzi, Carlo et al

Conference given outside the academic context (2012)

La mammite doit être ciblée en tant que maladie de production et risque de mortalité. Sa caractérisation repose sur une bonne connaissance de ses aspects épidémiologiques à l'échelle de la région, ainsi ... [more ▼]

La mammite doit être ciblée en tant que maladie de production et risque de mortalité. Sa caractérisation repose sur une bonne connaissance de ses aspects épidémiologiques à l'échelle de la région, ainsi, à l'aide d'indicateurs épidémiologiques pertinents, la mammite peut être caractérisée par une prévalence d'environ 100.000 cas wallons par an. Soit 50% de prévalence maximale en Wallonie. Sur base des informations disponibles sur le terrain wallon, il est possible d'identifier les cibles prioritaires thérapeutiques. A travers l'étude des bases de données de l'ARSIA, nous sommes en mesure de déterminer un schéma de travail incluant : les germes prioritaires et leur sensibilité moyenne aux antibiotiques. Dans une seconde phase, les aspects pharmacologiques du traitement des mammites sont revus à la lumière des contraintes que pose la mamelle bovine. Cette phase donne lieu à une meilleure adéquation entre choix du traitement, cible thérapeutique et sensibilité des pathogènes. Puis seront abordés des exemples de thérapeutiques en fonction du germe présent dans la ferme, en s'attardant sur la posologie choisie et le type de stratégie thérapeutique en fonction du degré d'atteinte. Les mammites impliquant Streptococcus uberis, Staphylococcus aureus, les staphylocoques coagulase négatif et les mammites à coliforme sont ainsi passées en revue. Enfin, la question de la thérapie anti-inflammatoire est abordée. 2 cas pratiques issus du terrain sont abordés en fin de formation afin d'illustrer la complexité de la thérapie mammaire, et le fait que le germe et le traitement ne sont jamais les seuls facteurs à prendre en compte pour le praticien. [less ▲]

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See detailUtilisation par les praticiens des données et des outils issus du projet LAECEA
Theron, Léonard ULg; Reding, Edouard; Bertozzi, Carlo et al

Conference given outside the academic context (2012)

La santé mammaire et la production laitière sont des enjeux capitaux pour le secteur de l'élevage en région wallonne, et donc pour la fonction du médecin vétérinaire rural. Les enjeux modernes de la ... [more ▼]

La santé mammaire et la production laitière sont des enjeux capitaux pour le secteur de l'élevage en région wallonne, et donc pour la fonction du médecin vétérinaire rural. Les enjeux modernes de la production laitière tels que la course à la productivité, la réduction des coûts de production et la maîtrise de la qualité des denrées alimentaire d'origine animale, amènent le vétérinaire du 21ème siècle à être confronté simultanément à ses rôles curatifs, préventifs et de partenaire économique. En outre, la mammite devient la première cause du recours aux antibiotiques en médecine bovine laitière, et l'avenir nous demande d'avantage de réflexion sur l'utilisation de ces thérapeutiques en élevage. Le lancement du projet LAECEA en 2010 a été une opportunité fédératrice, plusieurs praticiens ont été impliqués dans la récolte de données et dans la mise en ouvre, le testage et l'évaluation de nouveaux outils au travers du dossier de santé mammaire (DSM). Les résultats issus du projet LAECEA sont en outre des témoins du quotidien de la santé mammaire dans les élevages participants. L'étude de ces résultats peut orienter le diagnostic présomptif du clinicien en éditant l'épidémiologie loco-régionale de la mammite en Wallonie. Cette approche pourra permettre de cibler plus précisément le diagnostic mammaire, d'en tirer les conclusions en terme de fréquence, de moment d'apparition, d'étiologie. Ainsi, seront abordés les tendances épidémiologiques moyennes, l'impact économique de la variation des indicateurs générés, ainsi que les leviers préventifs associés à ces tendances. Le corollaire évident est une gestion plus précise des substances antimicrobienne, de part un diagnostic plus pré Le moment est venu, lors de ce forum d'été du RTVOL, de partager l'expérience de ces praticiens et de faire état des données rassemblées et de l'utilisation qui peut en être faite. Par la suite, tous les praticiens pourront utiliser ces outils dans leur pratique quotidienne. [less ▲]

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See detailLAECEA : un outil fédérateur d’aide à la décision pour le suivi de la santé mammaire dans les élevages bovins laitiers wallons
Reding, Edouard; Theron, Léonard ULg; Detilleux, Johann ULg et al

in 18èmes rencontres autour de la recherche sur les ruminants (2011, December)

La santé mammaire représente un des principaux problèmes pour l’élevage laitier. Dans le cadre de la plateforme fédératrice OSaM (Observatoire de la Santé Mammaire), le projet LAECEA (AWE–ULg) vise à la ... [more ▼]

La santé mammaire représente un des principaux problèmes pour l’élevage laitier. Dans le cadre de la plateforme fédératrice OSaM (Observatoire de la Santé Mammaire), le projet LAECEA (AWE–ULg) vise à la construction d’une base de données de la santé mammaire centralisant les informations collectées par les associations de la filière laitière wallonne ainsi que les données cliniques encodées par les éleveurs. De plus, ce projet souhaite mettre à disposition un Dossier de Santé Mammaire (DSM) mensuel permettant à l’éleveur d’évaluer l’impact économique des mammites et de cibler, avec son vétérinaire, la stratégie à mettre en place afin de le diminuer grâce à différents indicateurs ciblés. Dans le but de bénéficier des données du tank (Comité du Lait), des résultats d’analyse bactériologiques (ARSIA, Association Régionale de Santé et d’Identification Animale), et des données zootechniques (AWE), une base de données fédératrice a été mise en place. Afin d’enrichir celle-ci en données cliniques, un nouvel outil de saisie des pathologies en ligne a été créé et mis à la disposition des éleveurs dans leur espace Internet personnalisé my@wenet (www.awenet.be). Ils peuvent y saisir les informations relatives aux évènements de la santé mammaire (date, type d’évènement, quartier, sévérité…) et au(x) traitement(s) qui y est/sont associé(s). Sur les six premiers mois, près de 750 mammites ont été collectées. Les données récupérées dans les historiques en fermes portent ce chiffre à 2300. Les valorisations tirées de ces données sont rassemblées dans le DSM. Celui-ci est composé d’une page récapitulative dont certains aspects sont détaillés à travers différentes rubriques : évaluation économique (déjà disponible), microbisme et traitements, et management (en cours d’élaboration). Ce DSM permet notamment de quantifier la perte économique due à la santé mammaire, de quantifier le nombre de vaches à problèmes tant cliniques que subcliniques, de décrire la dynamique des infections mammaires au niveau du troupeau, d’identifier les groupes d’animaux les plus sensibles, d’identifier les principaux pathogènes impliqués, d’évaluer la qualité de la détection des mammites, de cibler les périodes de l’année et de la lactation les plus à risques. Une analyse statistique préliminaire sur les indicateurs générés dans les 201 premiers DSM confirment l’intérêt de la réussite du traitement au tarissement sur la santé mammaire de l’exploitation. De plus, cette investigation appuie la pertinence de l’approche économique partielle comme indicateur de santé mammaire global. [less ▲]

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See detailReproduction performances of Belgian Blue cattle in Wallonia
Hanzen, Christian ULg; Simon, Annik ULg; Theron, Léonard ULg et al

Conference (2011, September 09)

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See detailMastitis risk indicators assessed through a germ specific epidemiological model in southern Belgium
Theron, Léonard ULg; Sustronck, Bart; Bertozzi, Carlo et al

Poster (2011, September 07)

Bovine mastitis is the most prevalent pathology in dairy production; in order to identify herd related risk indicators, our study focused on germ-specific approach to refine known risk indicators between ... [more ▼]

Bovine mastitis is the most prevalent pathology in dairy production; in order to identify herd related risk indicators, our study focused on germ-specific approach to refine known risk indicators between environmental or contagious epidemiologic models. We gathered clinical mastitis during 3 months in 21 walloon dairy farms representing 1630 Holstein cows (mean: 67; SD: 18). Farmers were interrogated by a questionnaire about their main practices and basic mastitis knowledge questions. Quarters and severity were recorded, sampled for bacteriology at day 0 and day 21 during 3 months. Individual cell counts were also recorded. Risk analysis included Odds ratio calculation (OR) and multivariate regression. The average prevalence of mastitis on the study was 3.25% (min 0.3%, max : 11.2%, SD : 2.8%) which is coherent with previous epidemiological studies in Wallonia. 124 quarters were sampled and non-negative bacteriology shown 45% of strictly environmental pathogens, 22% of strictly contagious pathogens and 33% of mix epidemiological model pathogens. Overall risk assessment revealed that cubicles free-stall herds shown mastitis lower incidence (OR = 0.49; IC95 [0.34-0.72]). Surprisingly, post-dipping appeared as an overall positive risk indicator for mastitis prevalence (OR =2.13; IC95 [2,13-3,39]). The germ specific approach revealed that Post-dipping was present in low incidence herds with contagious models (OR=0.29; IC95 [0.12-0.71]) and that the type of pathogen model is an interaction in post-dipping risk analysis (Breslow-Day test p<0.0001), whereas housing had no interaction with the model (p=0.33). In this way of categorizing variables, one is able to identify overall risk indicators or germ-specific model. This can lead to more accurate advices in farm consulting. [less ▲]

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See detailEpidemiology of mastitis in 30 walloon dairy farms using a compilation of clinical and subclinical data in a new tool for Udder health assessment
Theron, Léonard ULg; Reding, Edouard; Detilleux, Johann ULg et al

in Proceedings of the 6th European congress of Bovine health management (2011, September)

Bovine mastitis has been assessed through somatic cells or clinical cases by farmers and vets but most of the time the perfect combination of both data remains unavailable. We tried to implement a new ... [more ▼]

Bovine mastitis has been assessed through somatic cells or clinical cases by farmers and vets but most of the time the perfect combination of both data remains unavailable. We tried to implement a new strategy of identification of mastitis-related costs, epidemiological impact and key periods of management. We built an online system for clinical data capture, including facilities for administrative management of veterinary drugs. Herd prevalence rate (HPR) is assessed through clinical and subclinical data. Lactation incidence rate (NIR) and cure rate (CR) were calculated for the period (depending on type of DHI control) using subclinical thresholds (primiparous > 150.000 cells/ml and multiparous >250.000 cells/ml) and clinical cases in susceptible animals (healthy or diseased). Dry-off period is studied through the Dry-off cure rate (DOCR) and new infection rate at first control (NIFC). The average number of cow-day-at-risk was 73.6 (StD=34.80). Mean HPR was 33 % (StD =11%); the average NIR was 16% and CR 35%. Mean DOCR was 62% with an NIFC of 23%. Regarding a mean loss for mastitis of 71€ per cow-year, the average difference was +40.7€ (StD=66.7€). It is explained partly by DOCR (R²=0.20; β=-131; p<0.0001). NIR is mainly influenced by HPR, but mainly by primiparous infection rate (R²=0.36; β= 0.33; p<0.0001). Those figures are coherent with subclinical data indicating that multiparous cows are becoming more and more infected, limiting efficacy of dry-off therapy. Communication has to be done around dry-off and preventive measures in primiparous cows. As CR had few significant impact on global udder health, cure at the herd level should more be regarded as cow ability to cure in its environment than by considerations on medication once infected. [less ▲]

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See detailConservation et valorisation de la Bleue Mixte au travers du projet franco-belge BlueSel
Colinet, Frédéric ULg; Glorieux, Géry; Beguin, Emmanuel et al

Poster (2011, March)

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See detailConservation et valorisation de la Bleue Mixte au travers du projet franco-belge BlueSel
Colinet, Frédéric ULg; Glorieux, Géry; Beguin, Emmanuel et al

in 16ième Carrefour des Productions animales: La filière laitière bovine européenne est-elle durable? (2011, March)

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