Mastitis in dairy production current knowledge and future solutions ; [4th IDF International Mastitis Conference, Maastricht, the Netherlands, 12-15 June 2005 ; papers

Worldwide, mastitis is still one of the most important diseases in the dairy sector. Being a multifactorial disease, caused by multiple pathogens, control remains a difficult issue. Mastitis not only affects the health of milk-producing animals, having consequences for the profitability of dairy farms, it also affects the animal welfare. Moreover, mastitis negatively influences the milk quality having consequences for the dairy processing industry. In other words: mastitis affects a large part of the dairy production chain. Due to ongoing scientific effort, insight in mastitis in the context of increasingly complex farming systems, is improving. This insight leads to better methods to control mastitis, either by prevention or by adequate measures (e.g. therapy) when a cow (or goat or sheep) gets mastitis. This book reflects the current knowledge from all over the world on mastitis as it was presented during the 4th IDF International Mastitis Conference, held in June 2005 in Maastricht, the Netherlands. The papers of the 115 oral presentations and the 13 keynote presentations are reflecting not only the current knowledge of mastitis control but are also giving ideas for future solutions for control measures Prepartum intramammary antibiotic therapy: Effects on udder health, milk production, and reproductive performance in dairy heifers -- Milking machine test survey -- Machine milking risk factors for teat end callosity in dairy cows on herd level -- Long-term effects of different pulsation characteristics on teat thickness, teat skin moisture and teat skin pH of dairy cows -- Details of some of the forces applied to the cow's teat during milking -- Effects of lactic acid teat dip on chapped teat skin -- Technical success and effectiveness of teat cleaning in automatic milking in Finland -- Use and interpretation of bacteriology in the diagnosis of bovine intramammary infection -- Evaluation of the PetrifilmTM culture system for the identification of mastitis bacteria as compared to standard bacteriological methods -- Testing for Staphylococcus aureus in herds with a low bulk milk somatic cell count -- Simultaneous detection of mastitis pathogens in milk by multiplex real-time polymerase chain reaction -- Optimised sample sizes for analysing the genetic heterogeneity of mammary pathogen isolates from environmental samples -- Somatic cell count patterns to improve udder health by genetics and management -- Changes in lactate dehydrogenase, N-acetyl-β-D-glucosaminase, and somatic cell count in relation to development of mastitis in dairy cows -- Prevalence of contagious mastitis pathogens in bulk tank milk from Prince Edward Island dairy farms -- A Bayesian approach to interpreting Staphylococcus aureus diagnostic indicators for on-farm decision making -- Variation in somatic cell count and milk components in fraction collected quarter milk samples -- Using milk L (+) lactate as a diagnostic tool to detect bovine mastitis in the early lactation -- Milk amyloid A (MAA) concentration and somatic cell count (SCC) in the diagnosis of bovine mastitis Chemotherapeutic approaches to bovine mastitis caused by Staphylococcus aureus through strain identification using random amplified polymorphic DNA analysis -- Efficacy of a cloxacillin dry cow product for treatment of heifers on farms with a low and a high prevalence of heifer mastitis in The Netherlands -- Efficacy of a J-5 Escherichia coli bacterin in clinical coliform mastitis of dairy cattle -- Effect of carprofen following experimentally induced E. coli mastitis in primiparous cows -- Iron uptake and growth responses by Escherichia coli cultured with antibodies from cows immunized with high affinity ferric receptors -- In vitro susceptibility of biofilm growing Staphylococcus aureus isolates for 10 antibiotics -- Better management of mastitis treatment: Contribution of consensus conference methodology -- Leukocyte dynamics and cytokine expression in response to mycobacterial water soluble compounds in bovine mastitis -- Direct and indirect effects of subclinical mastitis treatment in dairy herds -- Therapeutic treatment with casein hydrolyzate eradicate effectively bacterial infection in treated mammary quarters in cows -- Antibiotic resistance in Staphylococcus aureus isolated from bovine udders: Development related to introduction of dry cow therapy? -- Orbeseal -- and Orbenin -- EDC in combination for the treatment of intra-mammary infections at drying off and prevention of new infections during the dry period and early lactation in dairy cows -- The safety and efficacy of the immunotherapy treatment Y-Complex in a clinical mastitis study under field conditions -- Therapeutic effect of systemic or intra-mammary antibiotic treatment of bovine sub-clinical mastitis during lactation -- An alternative treatment trial for Staphylococcus aureus mastitis in organically managed dairy cattle Intro -- Mastitis in dairy production -- Preface -- Organizing committee -- Scientific committee -- Inhoud -- Mastitis research and control: Where do we come from and where are we going? -- Pathogenesis of mastitis and mammary gland immunity: Where we are and where we should go -- Mastitis management in an economic framework -- New antimicrobial agents in mastitis therapy -- The contribution of science to progress in milking technology -- Mastitis in small ruminants -- Animal welfare: Of increasing importance in modern dairy production -- Diagnosis of mastitis and indicators of milk quality -- Mastitis control systems: The Norwegian experience -- Antimicrobial resistance in mastitis organisms as a public health threat -- Environmental control for mastitis prevention, milk quality and food safety -- Genetic improvement in mastitis control programmes -- Milk production and mastitis control in emerging dairy countries: The experience in Chile -- Pathogenesis of chronic intramammary Escherichia coli infections -- Persistence of Streptococcus uberis in bovine mammary epithelial cells -- Association between genotype of Staphylococcus aureus, recovered at the end of lactation, and cure of the organism in the dry period -- Toxin genes of Staphylococcus aureus isolated from bovine intramammary infection of different clinical characteristics and outcome -- Changes in leucocyte surface receptor expression and functional responses in dairy cows with Staphylococcus aureus infection -- Vitamin E supplementation and udder health: A meta-analysis -- α-Tocopherol concentration and stereoisomer composition in plasma and milk from dairy cows fed natural or synthetic vitamin E around calving -- Comparison of blood and milk non-specific immune parameters in heifers after calving Influence of resident milk neutrophils chemiluminescence and viability on the severity of bovine coliform mastitis -- Potential association of polymorphisms in the bovine CXCR2 gene with neutrophil survival and killing ability -- Differential cell count and interdependence of udder quarters -- Response of rhlf-transgenic dairy cows to expermentally induced escherichia coli mastitis -- Cell function in the bovine mammary gland: Interdependence of healthy and infected udder quarters -- Delayed neutrophil apoptosis in bovine subclinical mastitis: Possible involvement in persistent accumulation of cells in milk -- Use of partial budgeting to determine the economic benefits of antibiotic treatment during lactation of chronic subclinical mastitis caused by Staphylococcus aureus -- Impact of epidemiological, zootechnical, managerial and price factors on the economic efficacy of subclinical mastitis treatment during lactation -- Stochastic economic modeling of the use of penethamate hydriodide (Mamyzin -- ) in heifers around calving to control peri-parturient mastitis -- Importance of uncertainties in the effects of pathogen specific mastitis on profit in dairy herds estimated by stochastic simulation -- Costs and benefits of improved milking practices in smallholder dairy farms in the 10th region of Chile -- Udder health, treatments and pathogens in organic dairy herds in the Netherlands -- High milk yields and the risk of mastitis in different herd environments -- Association between somatic cell count in early lactation and culling of dairy heifers using Cox frailty models -- Reducing subclinical and clinical mastitis in dairy heifers by precalving infusion of a teat sealant and/or parenteral antibiotic therapy Diagnosis of mastitis by benzoic acid (benzene sulfonic acid)and sodium carbonate on pregnant and lactating mastitic animals -- Use of on-farm testing of somatic cell count for selection of udder quarters for bacteriological culturing -- Diagnostic value of the California Mastitis Test in comparison to electronically-counted somatic cells in bovine milk -- Aetiological, clinical and epidemiological characterization of clinical mastitis in dairy sheep -- Detection of enterotoxins and virulence genes in Staphylococcus aureus strains isolated from sheep with subclinical mastitis -- Subclinical mastitis affects the plasmin system, milk composition and curd yield in sheep and goats: comparative aspects -- Host response reactions of the lactating ovine udder during experimental challenge with Staphylococcus epidermidis -- Efficacy of antibiotic treatment at drying-off in curing existing infections and preventing new infections in dairy goats -- Associations between hygiene scores and udder health parameters in organic dairy herds -- Teat lesions and teat necrosis in heifers in The Netherlands -- Effect of stockperson-dairy cow interaction to mammary gland health -- The systems approach to udder health control -- The importance of a low SCC premium policy in the reduction of population wide SCC levels -- Use of SCC in genetic selection for reduced incidence of mastitis: A mixture model approach -- Genetic improvement of mastitis resistance in Norwegian Red (NRF) -- Social factors related to mastitis control practices: The role of dairy farmers' knowledge, attitude, values, behaviour and networks -- Mastitis and farmers perceptions and actions: An anthropological perspective to the phenomenon of mastitis Implementation of recommended mastitis prevention management practices and the herd level prevalence of contagious mastitis pathogens on Canadian dairy farms