References of "Hanzen, Christian"
     in
Bookmark and Share    
Full Text
See detailEmergence of coagulase negative staphylococci in Southern Belgium - Facts and Figures
Theron, Léonard ULg; Bughin, Jean; Detilleux, Johann ULg et al

Conference (2010, September 16)

Since the early 1990s in Wallonia, coagulase negative staphylococci (CNS) have been identified as mastitis agent, both clinical and subclinical. As there epidemiological cluster has not yet been clearly ... [more ▼]

Since the early 1990s in Wallonia, coagulase negative staphylococci (CNS) have been identified as mastitis agent, both clinical and subclinical. As there epidemiological cluster has not yet been clearly classified between environmental and contagious pathogen, several questions subsists toward this class of mastitis etiological agents. From the late 1990s were the CNS represented 12% of infected quarters to 23% of all positive identifications in 2008, the CNS have taken a large part of the clinical cases of mastitis. Comparatively, CNS in Flanders represents only 7% of clinical cases identifications and 24% of subclinical cases. They still represent low inflammation pathogens, as for the average somatic cell count (SCC) of a CNS infection is 450.000 cells/ml (DETILLEUX, J. 1999. Preventive Veterinary Medicine, 41, 75-88.) but they represent for sure a source of treatment events in farm as for they provoke clinical mastitis. So, however they are seen as minor pathogens of a lesser matter regarding milk production drop, they still can imply a treatment a loss of discarded milk. Whether or not they should be treated could be approached through the Mammipack® project results. 124 common clinical mastitis events where sampled for bacteriology at day 0 and day 21 (Fig. 1). Farmer were asked to qualify the severity of the mastitis whether it had abnormal milk (score 1); abnormal quarter (score 2) or hyperthermia/anorexia (score 3). Also, they recorded the treatment used and we collected the SCC of each cow recorded, 2 months before the clinical signs until 3 months after. We decided to define as “chronic cases” cows showing SCC > 250.000 cells/ml the month before the clinical event and as “cured” cows showing SCC < 250.000 cells/ml the month after the event or the next one if the mastitis took place less than 15 days before test day. We could show that CNS infections still account for the least severe cases (Fig. 2), except for S. simulans, S. saprophyticus and S. hominis that shown some quarter indurations. While only 10% of clinical infection does remain clinically uncured to the farmer, figure 3 explains how 50% of CNS infections in our essay remained globally cured (Bacteriological and tissular), even if 40% of their treatments shown to be inadequate. Also, only one infection could be referred as a chronic case, all the others were acute cases. Though this study recorded a small amount of cases, yet we did not find any results differing from known characteristics of CNS infections. One interesting facts is the quite easy cure of the infected quarters given the poor quality of treatment. [less ▲]

Detailed reference viewed: 54 (11 ULg)
Full Text
Peer Reviewed
See detailBovine mastitis with unusual pathogens: how to manage it in individuals and in the herd.
Theron, Léonard ULg; Pluvinage, Pascal; Serieys, Francis et al

in Bulletin des Groupements Techniques Vétérinaires (2010), (54), 41-53

Unusual mastitis pathogens have a mean prevalence of 8 to 25% of microbiological isolates on a specific broth. These germs have their own epidemiological model, which is mostly environmental. For ... [more ▼]

Unusual mastitis pathogens have a mean prevalence of 8 to 25% of microbiological isolates on a specific broth. These germs have their own epidemiological model, which is mostly environmental. For Prototheca, the main risks are water and food sources. In cases of Candida mastitis, we must always evaluate treatment practices for contamination. Other pathogens such as Enterococcus and Klebsiella are closely linked to bedding quality, whereas Listeria is mostly related to ration contamination. Arcanobacterium represent an original vectorial model. Mycoplasma is a contagious pathogen which can be prevented by examinations during purchase of an animal. At least, regarding Bacillus and Nocardia, environnemental risks and feeding management are mandatory, but reservoirs are not easily identified. When it comes to treatment, it is important to note that either physical or chemical isolation during milking, or the culling of carriers is often the only profitable therapeutic option. [less ▲]

Detailed reference viewed: 118 (21 ULg)
Full Text
Peer Reviewed
See detailLa césarienne dans l’espèce bovine. Résultats d’une enquête internationale relative aux indications, modalités techniques et thérapeutiques de réalisation et conséquences.
Hanzen, Christian ULg; Gauthier, Bernard; Paindavenne, Pierre et al

in Comptes-rendus des journées nationales des groupements techniques vétérinaires (2010, May 27)

Le texte présente les résultats d’une enquête sur les indications les circonstances et techniques opératoires de la césarienne chez la vache.508 vétérinaires de différents pays ont répondu au ... [more ▼]

Le texte présente les résultats d’une enquête sur les indications les circonstances et techniques opératoires de la césarienne chez la vache.508 vétérinaires de différents pays ont répondu au questionnaire proposé (www.upv/cesarienne/. Dans la majorité des cas, la césarienne est pratiquée en race charolaise(32.3%) ou Blanc Bleu Belge (29.9%) pour cause de disproportion foeto pelvienne(64.6% des cas) sans tranquilisation générale( (80%) , sous anesthésie locale ou loco régionale ,en position debout sur le flanc gauche (98.5%). La désinfection se fait dans 74.5% des cas à la chlorhexidine, 99% des confrères ont recours à un traitement anti microbien post opératoire, 85 % n’utilisent pas de traitement anti inflammatoire après l’intervention. Les vétérinaires estiment à 5.6% la fréquence moyenne des complications dans les trois premières semaines suivant la césarienne .A ce stade il s’agit d’une enquête purement descriptive appelée à être complétée. Un appel est lancé aux praticiens pour réfléchir aux avantages et inconvénients des différentes pratiques . La publication d’un cahier des charges de nature à aider les confrères est envisagé . [less ▲]

Detailed reference viewed: 474 (98 ULg)
Full Text
See detailMammites aigues du bovin - Diagnostic et traitements
Theron, Léonard ULg; Hanzen, Christian ULg

Conference given outside the academic context (2010)

Au cours d'un exposé théorique présentant la revue de la littérature récente sur la mammite à coliforme, la pathophysiologie des différentes expressions cliniques sera abordée. La mammite à coliformes ... [more ▼]

Au cours d'un exposé théorique présentant la revue de la littérature récente sur la mammite à coliforme, la pathophysiologie des différentes expressions cliniques sera abordée. La mammite à coliformes présente des risques majeurs de mortalité au post partum. Par ailleurs, cette affection présente des symptômes communs à d'autres affections mammaires du post-partum. Ainsi, le diagnostic clinique peut avoir des conséquences importantes en matière de choix de l'antibiotique par exemple. Par ailleurs, les techniques de fluidothérapie de base sont souvent sous-utilisées sur le terrain, pour des contraintes administratives liées à la cascade thérapeutique. Il est également marquant que cette affection entraîne des chutes importantes de production, ce qui implique que la gestion préventive de cette pathologie demeure au 21ème siècle une priorité pour le praticien moderne. Plusieurs aspects peuvent être évoqués au nombre desquels les équilibres nutritionnels du tarissement, la gestion thérapeutique du pré-partum, l'hygiène du péri-partum et le traitement intramammaire au tarissement. Enfin, la mammite colibacillaire demeure une urgence thérapeutique et trop peu souvent elle fait l'objet de conseil écrit de la part du thérapeute, ce qui, selon plusieurs études récentes, constitue en soi un facteur de risque. [less ▲]

Detailed reference viewed: 334 (85 ULg)
Full Text
Peer Reviewed
See detailImpact de tests formatifs en ligne sur l’implication et la perception de leur utilité par des étudiants en médecine vétérinaire
Hanzen, Christian ULg; Crahay, Vinciane ULg; Detroz, Pascal ULg et al

in Proceedings du 26ème congrès (2010, May 15)

La dynamique motivationnelle des étudiants est un phénomène complexe. Les activités d’évaluation sont de nature à influencer ses principaux déterminants que sont la perception que l’étudiant a de sa ... [more ▼]

La dynamique motivationnelle des étudiants est un phénomène complexe. Les activités d’évaluation sont de nature à influencer ses principaux déterminants que sont la perception que l’étudiant a de sa compétence et du contrôle qu’il peut opérer sur une activité d’apprentissage fusse-t-elle évaluative. Par ailleurs elles sont également de nature à renforcer son degré de persévérance et donc à mettre en œuvre des stratégies d’auto-motivation. Ce constat nous a incités à mettre en place au cours de l’année académique 2009-2010 un design d’évaluation des 268 étudiants de 2ème graduat en médecine vétérinaire (5ème année du cursus). Il concerne les 40 heures d’enseignements théoriques du cours de Thériogenologie des animaux de production. Dix tests formatifs constitués de 10 questions à choix multiples avec solutions générales implicites et degrés de certitude (+20/-20) ont été hebdomadairement proposés durant le premier semestre de l’année académique 2009-2010. Ces tests d’une durée de 20 minutes ont en ligne mis à disposition des étudiants via la plateforme Exams. L’ensemble des 100 questions a fait l’objet d’un dernier test préparatif deux semaines avant le test certificatif de 60 questions organisé au cours de la première semaine du mois de janvier 2010. Chaque test a été suivi 24 heures plus tard de retroactions individuelles (corrections des questions et justifications des réponses correctes) et de groupe (résultats nominatifs de tous les étudiants). Les étudiants ont par ailleurs été invités à remplir un questionnaire de satisfaction avant leur passation du test certificatif. Au travers de ce design nous souhaitions répondre à différentes questions relatives à l’implication et à la démarche réflexive des étudiants à l’encontre des activités d’évaluation proposées. Ainsi en ce qui concerne leur implication avons-nous cherché à savoir (1) leur degré de participation aux tests formatifs, (2) son évolution au cours du temps, (3) leur degré de persévérance, (4) l’effet de leur persévérance sur leur degré de réussite non seulement aux tests formatifs mais également certificatif, (5) leur utilisation des degrés de certitude (6) son évolution au cours du temps et (7) les différences éventuelles existant entre les filles et les garçons. De même en ce qui concerne l’analyse de leur démarche réflexive avons-nous cherché à préciser (1) leur sentiment de validité du score obtenu c’est-à-dire sa capacité à refléter ce qu’il prétendait mesurer, (2) leur sentiment à l’encontre de l’impact des degrés de certitude sur leurs résultats, (3) l’impact des retro-actions individuelles et de groupe fournies après chaque évaluation pour interpréter leurs performances, (4) réguler leurs apprentissages, (5) l’impact émotionnel de la comparaison avec les résultats des collègues, (6) les différences éventuelles entre les garçons et les filles. [less ▲]

Detailed reference viewed: 146 (32 ULg)
Full Text
See detailQuand et comment démontrer l'effet potentiel de l'alimentation sur 6 pathologies de la reproduction bovine ?
Hanzen, Christian ULg

Conference given outside the academic context (2010)

La nutrition constitue un facteur dit collectif susceptible d'avoir un impact négatif sur les performances de reproduction en général et sur les pathologies de la reproduction en particulier. La ... [more ▼]

La nutrition constitue un facteur dit collectif susceptible d'avoir un impact négatif sur les performances de reproduction en général et sur les pathologies de la reproduction en particulier. La présentation expose dans un premier temps, au travers d'un raisonnement hypothético-déductif, les étapes préliminaires à l'identification et l'interprétation d'un problème de fécondité et/ou de fertilité. Dans un second temps, sont exposées au moyen de cartes conceptuelles les principales sources d'energie chez la vache laitière, leur métabolisme et mécanismes hormonaux régulateurs ainsi que leurs effets sur la rétention placentaire, les anostrus, les infections utérines et la mortalité embryonnaire. Enfin sont proposés quelques outils pratiques d'identification d'une balance énergétique négative au niveau du troupeau. [less ▲]

Detailed reference viewed: 191 (21 ULg)
Full Text
Peer Reviewed
See detailAPPROCHE DICHOTOMIQUE DE LA BACTÉRIOLOGIE DES MAMMITES - UNE AIDE À LA PRISE DE DÉCISION THÉRAPEUTIQUE AU CHEVET DU PATIENT
Theron, Léonard ULg; Hanzen, Christian ULg

in Antibiothérapies : Santé animale et santé publique (2010, May)

In France and Belgium, 50 to 100 % of all dairy animals receive at least an intramammary antibiotic treatment for bovine mastitis during lactation. Yet, results of bacteriology reveal a lack of growth in ... [more ▼]

In France and Belgium, 50 to 100 % of all dairy animals receive at least an intramammary antibiotic treatment for bovine mastitis during lactation. Yet, results of bacteriology reveal a lack of growth in more than one third of the cases, also Escherichia coli accounts for 17% of the three germs mostly identified. Several recent authors support management of infections with E. coli in lactation without any antibiotic. Given these facts, the question of antibiotics use for mastitis may be highlighted. To do this, simplified bacteriology devices, such as Petrifilm®, can be used to develop a dichotomous strategy guided by the veterinarian on a treatment plan that excludes the routine use of antibiotics on E. coli and negative growth. The principle is growing on a plate for non-selective aerobic germ, a selective plate for E. coli and a selective plate for staphylococci. This strategy may be conducted by the producer, in consultation with his veterinarian, to minimize the risk of emergence of an atypical germ. [less ▲]

Detailed reference viewed: 114 (15 ULg)
Full Text
Peer Reviewed
See detailUN NOUVEAU SYNDROME HÉMORRAGIQUE INEXPLIQUÉ CHEZ LE BOVIN – LA PANCYTOPÉNIE NÉONATALE BOVINE
Theron, Léonard ULg; Vogin, Nathalie; Moreaux, Emeline et al

in Antibiothérapies : Santé animale et santé publique (2010, May)

For several decades, the bovine was subject to various hemorrhagic syndromes which causes have historically been found. Since the mid-2000s, a new hemorrhagic syndrome seems to emerge with a significant ... [more ▼]

For several decades, the bovine was subject to various hemorrhagic syndromes which causes have historically been found. Since the mid-2000s, a new hemorrhagic syndrome seems to emerge with a significant epidemiological consistency, suggesting a common etiology, although unknown at present. The affected animals were calves of less than 30 days, of all races born to mothers without specific parity. We noticed a very sporadic disease (1/10.000) but lethal to 99%. The characteristic lesions are multifocal hemorrhages, hyperthermia, melena, we noted medullar aplasia systematically. These calves are vironegative for BTV, enzootic bovine leukosis and BVDV. No viral or bacterial agent could be isolated. It seems that most of these calves were born from dams vaccinated against BVDV. The track of an immune dysfunction is the most serious for the moment. [less ▲]

Detailed reference viewed: 253 (43 ULg)
Full Text
Peer Reviewed
See detailPancytopénie néonatale : nouveau syndrome hémorragique chez le bovin
Theron, Léonard ULg; Vogin, Nathalie; Moreau, Emeline et al

in Point Vétérinaire (2010), 41(Numéro spécial), 79-86

For 30 years, many haemorrhagic syndromes were observed in cattle. The recent observation in Europe of a new entity hemorrhagic highlights a consistent set of clinical cases in calves of all breeds under ... [more ▼]

For 30 years, many haemorrhagic syndromes were observed in cattle. The recent observation in Europe of a new entity hemorrhagic highlights a consistent set of clinical cases in calves of all breeds under 30 days of age, with pancytopenic haemorrhagic purpura. Calves are vironegative for BVD and BTV, most are seropositive for both viruses antibodies. No specific etiology has been highlighted, but it seems that the syndrome is linked to the ingestion of colostrum immunized against cells of the calf. The syndrome is sporadic, with a prevalence ranging between 1:10,000 and 1:100,000 cattle under one year of age, causing a lethality of 99%. The origin of the pancytopenia is a medullar aplasia. [less ▲]

Detailed reference viewed: 403 (23 ULg)
Full Text
Peer Reviewed
See detailWhen is a cow in estrus? Clinical and practical aspects.
Roelofs, Judith; Lopez-Gatius, Fernando; Hunter, R. H. F. et al

in Theriogenology (2010)

Good detection of estrus is critically important in dairy husbandry. Incorrect detection of estrus is related to loss of profit due to extended calving intervals, milk loss, veterinary costs, etc ... [more ▼]

Good detection of estrus is critically important in dairy husbandry. Incorrect detection of estrus is related to loss of profit due to extended calving intervals, milk loss, veterinary costs, etc. Detection of estrus remains a major problem despites enormous progress in the knowledge of reproductive physiology of the cow and in development of estrus detection aids. To achieve good estrus detection, many factors have to be taken into account. On one hand a cow has to express estrus and on the other hand the farmer has to detect it. Combined action of several hormones causes physiological changes that lead to ovulation and an environment in the uterus that allows sperm to fertilize the egg. Besides these internal actions, a number of external changes can be observed. When using visual observations, time of the day and time spend on observation have a great impact on detection rates. Many devices are available to aid in estrus detection, such as pedometers, mount devices, temperature, and hormone measurements. Expression of estrus can be influenced by many factors. Heritability, number of days postpartum, lactation number, milk production, and health are known to influence estrus expression. Environmental factors like nutrition, season, housing, herd size, etc. also play a role in estrus expression. To evaluate estrus detection, record keeping is very important; a number of formulas can be used to assess detection efficiency. Besides the farmer, the veterinarian and inseminator can play an important role in estrus confirmation and good insemination strategy. In the end, the time of ovulation and the age of the egg at sperm penetration is critical for conception. Therefore, emphasis in research needs to be on the timing of insemination relative to ovulation, and thus on the detection of ovulation [less ▲]

Detailed reference viewed: 92 (22 ULg)
Full Text
Peer Reviewed
See detailDescribing an emerging disease: A case of thrombocytopenic syndrome of the newborn calf
Theron, Léonard ULg; Vogin, Nathalie; Bayrou, Calixte ULg et al

in Maillard, R.; Navetat, H. (Eds.) European buiatrics forum 2009 (2009, December 03)

Since the last 5 years, a specific hemorrhagic syndrome of unknown etiology was described in young calves. This disease has a low incidence but a very high mortality rate. No etiology has been found yet ... [more ▼]

Since the last 5 years, a specific hemorrhagic syndrome of unknown etiology was described in young calves. This disease has a low incidence but a very high mortality rate. No etiology has been found yet, though many labs have already gathered lots of cases around Europe. For example, more than 200 cases in 170 farms in Germany, 60 cases in 40 farms were described in Gent’s veterinary faculty in Belgium. In France and in the United Kingdom, several cases have been recorded yet, in multiple different locations. As far as we know, the disease concern young calves aging between 10 and 30 days, from different breeds. Most calves present a purpura on multiple sites on skin, gums, eye sclera and ears. Hematology indicates severe anemia, thrombocytopenia, neutropenia with or without leukopenia. Necropsy indicates multiple hemorrhages in serous membranes on every abdominal viscera. Alfort’s veterinary faculty has described acute necrotizing hepatitis on one case in France. Those calves are BVDV and BTV negative both on antigen tests. In Liege’s veterinary faculty one live case was examined, from a modern farm with 160 calvings, and less than 5% of calf mortality per year. The farm had 3 hemorrhagic fatal cases during July 2009, of very quick evolution. From those, 2 were autopsied and diagnosed BVDV negative. The 20 days old calf had hyperthermia in the morning, received oxytetracycline in the farm and began bleeding at noon. As many of the described cases, the calf presented mild depression with hyperthermia and tachypnoea. Skin and ear purpura, gum hematoma, melena, hematuria and hemoglobinuria were noticed. Hematology revealed a severe anemia with decreased hematocrite due to a profound thrombocytopenia (4.79*109/l). Leukocytes formula also shown neutropenia (0.10*109/l) and a monocytosis (1.32*109/l). It resulted in a mild leukopenia (3.59*109/l). We also noticed hypogammaglobulinemia (2.92 g/l and 6.8% of total protein). This calf received an immune-suppressive treatment with a high dose of dexamethasone (0.64mg/kg), and a cover antimicrobial therapy (Enrofloxacine). A good evolution of the symptoms on day 2 was observed. Leukocyte formula had a normal answer to dexamethasone concerning the lymphocytes and neutrophils population. On day 6, blood formula was already stabilized, with increasing hematocrite from 12% on day 3 to 15%. Thrombocytes count has also increased to 58.20*109/l; leukocytes count was also back to normal with normal formula. Flow cytometric measures on the lymphocytes subpopulations indicated a subnormal Gamma-Delta and Natural Killer population, and a high number of apoptotic cells 12 hours after sampling. This syndrome can be linked to idiopathic thrombocytopenia in human newborn both regarding symptomatology and treatment answer. Though this data helps in the understanding of this pathology, it concerns only one animal and needs to be confirmed through further experiment on live cases. [less ▲]

Detailed reference viewed: 176 (29 ULg)
Full Text
Peer Reviewed
See detailIdentification and Ranking of risk factors for somatic cell count economic penalty in 349 southern Belgium dairy farms
Theron, Léonard ULg; Humblet, Marie-France ULg; Delfosse, C. et al

in Maillard, R.; Navetat, H. (Eds.) European buiatrics forum 2009 (2009, December 02)

In Belgium, the main economic penalty accounted for bovine milk quality is the bulk milk somatic cell count geometric mean over 3 months reaching more than 400,000 cells/ml. Yet, it is still difficult to ... [more ▼]

In Belgium, the main economic penalty accounted for bovine milk quality is the bulk milk somatic cell count geometric mean over 3 months reaching more than 400,000 cells/ml. Yet, it is still difficult to make progress on udder health and milk quality because regional risks related to endemic farming practices are not broadly known. Hence, a first step in understanding specific udder health risks associated with herd management has to be a broad ecopathological survey. A random stratified sample of 349 dairy farms, representing 25% of producers registered for performance recording, was selected with a total of 16,000 cows. Thorough audits recording 400 farming practices were made in each farm by 2 different surveyors during milking. The practices were recorded across four categories: Herd structure, Housing, Milking practices and Herd Management (including Nutrition). Our chosen variable was the geometric mean of the herd composite somatic cell count from the last three months compared to the 400,000 cells/ml European threshold. The sample had a mean somatic cell count of 287,000 cells/ml following a normal distribution between 73,000 and 807,000 cells/ml. From 19 risk indicators identified through univariate logistic analysis (p<0.15), half were related to milking practices and 5 were underlined by significant odds-ratios (OR) found through multivariate logistic analysis (p<0.05). Therefore, it was found that cubicle housing had the least risk (OR= 0.59 compared with tightened stalls, OR= 0.42 compared with straw stalls); Presence of a calving pen (OR= 0.40), use of post-dipping (OR= 0.50) had a positive impact; whereas pre-dip had a negative impact in our study (OR= 3) though it was not clear if this routine was performed correctly. Stripping also had a bad impact on milk quality whether it was systematic (OR = 1.90) or occasional (OR = 2.43). It was also found that farms with poor milking liner hygiene had more trouble (OR = 2.34). The results were comparable to other ecopathological studies such as northern and southern American and European studies. This study is a prerequisite in operational veterinary advice in southern Belgium dairy farms, because it provides a cross-sectional study of dairy practices and states on major epidemiological risk factors in dairy management for this region. [less ▲]

Detailed reference viewed: 101 (26 ULg)
Full Text
Peer Reviewed
See detailImplementing pedagogic strategies between vets and farmers to create synergies in udder health management: Project Mammipack®
Theron, Léonard ULg; Sustronck, Bart; Bertozzi, Carlo et al

Poster (2009, December)

Udder health is usually considered as a health and economic problem for farmers. We now consider that mastitis is the result of many factors related to the environment, the pathogen and the host. What may ... [more ▼]

Udder health is usually considered as a health and economic problem for farmers. We now consider that mastitis is the result of many factors related to the environment, the pathogen and the host. What may have been forgotten in the process is the fact that nowadays, the main interface with mastitis is the farmer, and their knowledge about mastitis is very heterogeneous. This reflexion has led to the creation of a technical and pedagogical pack called “Mammipack” which contains different tools, from all actors of the dairy chain. We included small charts explaining the most important risk factors identified through epidemiology, good dairy practices and its effect on milk flow, milking machine check-up, how-to for mastitis milk sample, a how-to for performance records use for udder health management, a resume on genetic selection of sires and mastitis, charts upon nutrition factors and their main effect on udder physiology during lactation and dry-off, resume on veterinary drugs good management in the farm. Small laminated sheets upon milk sampling for bacteriology and teats evaluation were also joined in order to be use in parlors, sterile sampling tubes were also given in the pack. A mastitis record pad was designed to record the main clinical forms and the treatment chosen. Eventually, the book Udder Health® was added to have a complete modern look on that problem in dairy farms. 25 farmers were selected on a voluntary base by 12 veterinarians, and they answered to questionnaires about their main practices regarding herd structure, mastitis treatment, and southern Belgium main 19 risk factors. They had to answer basic questions concerning udder health on 15 points. They agreed to keep a record of all next mastitis cases in their farms and take milk samples for bacteriology each time at day 0 and day 21 during 3 months. The main objective is to show to a group of dairy farmers that mastitis could take several different forms from one farm to another, in term of incidence, pathogens and clinical forms. One other purpose is to show the difficulty to have bacteriological cure, even when physical cure has happened. After all, one collateral objective was to create the Mammipack®, designed for farmers and vets to increase their ability to collaborate on mastitis management through most dairy chain actors’ expertise. [less ▲]

Detailed reference viewed: 56 (12 ULg)
Full Text
See detailAnomalies et traitements de la cyclicité dans l’espèce bovine
Hanzen, Christian ULg

Conference given outside the academic context (2009)

Detailed reference viewed: 41 (3 ULg)
Full Text
Peer Reviewed
See detailRisks analysis of dairy practices impact on herd udder health in walloon dairy farms
Theron, Léonard ULg; Saegerman, Claude ULg; Hanzen, Christian ULg

Poster (2009, September 22)

As most of production pathologies in dairy farming, mastitis is characterized by a multifactorial aetiology. Its diagnosis and treatment requires a good knowledge of its determinant and predisposing ... [more ▼]

As most of production pathologies in dairy farming, mastitis is characterized by a multifactorial aetiology. Its diagnosis and treatment requires a good knowledge of its determinant and predisposing factors. The comparative epidemiology of 349 walloon farms registered to individual milk analysis programs led to highlight the practices used in farms whose last 3 months' herd somatic cell count was above 400.000 cells/ml. We identified the following risk indicators relative to 1) herd demography : age, composition, herd production average, percentage of high cell counts animals 2) the animal housing : use of straw as bedding stall for all classes of animals and lack of a calving pen 3) the milking machine : milking cups cleaning 4) the dairy practices : lack of washing cloth towels between 2 milkings, occasional foremilk check, stripping, lack of post-dip and 5) animal nutrition : mould on beet pulp silos and composition of the main concentrate. This descriptive and univariate analysis confirmed the risky situation of a large majority of dairy farms regarding the recommendations of good dairy practices guides. [less ▲]

Detailed reference viewed: 84 (28 ULg)
Full Text
See detailL'université entre hasard et nécessité
Hanzen, Christian ULg

Speech (2009)

Detailed reference viewed: 17 (1 ULg)
Full Text
See detailApplication du raisonnement clinique à l'interprétation d'un bilan de reproduction bovine
Hanzen, Christian ULg

Conference given outside the academic context (2009)

Detailed reference viewed: 108 (13 ULg)
See detailTraitement des mammites - Actualité et mises en pratique
Theron, Léonard ULg; Hanzen, Christian ULg

Conference given outside the academic context (2009)

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 ▲]

Detailed reference viewed: 150 (40 ULg)
Full Text
Peer Reviewed
See detailLe Système de Conseil Agricole : pour une synergie du conseil agronomique, zootechnique, économique et conditionnalité au bénéfice de l’éleveur
Gounot, G.; Hanzen, Christian ULg; Hobe, M. et al

in Recueil des journées nationales 2009 (2009, May)

Entré en vigueur en 2008, le Système de Conseil Agricole est un nouveau mode de travail dans le milieu agricole. Les exploitants agricoles ne sont plus en contact direct avec l’administration pour ... [more ▼]

Entré en vigueur en 2008, le Système de Conseil Agricole est un nouveau mode de travail dans le milieu agricole. Les exploitants agricoles ne sont plus en contact direct avec l’administration pour l’application des règles de conditionnalité des aides, mais sont conseillés par des organismes aux compétences multiples. Ces derniers doivent être capables d’apporter les appuis techniques et économiques nécessaires, répondant aux critères imposés par l’administration. On assiste donc à un transfert de compétences et de responsabilité de l’administration vers les SCA. Le fonctionnement des SCA est décrit dans cet article, avec l’exemple d’un réseau de compétences mis en place en Bretagne [less ▲]

Detailed reference viewed: 55 (12 ULg)