dairying

..Many challenges with genomic selection and its implementation remain, including increasing the accuracy of GEBV, integrating genomic information into national and international genetic evaluations, and managing long-term genetic gain...

..coli, connection between endotoxins, tumor necrosis factor-alpha and nitric oxide, severity classification of E. coli mastitis, lifespan of neutrophils, host factors that influence severity, tissue damage and production loss...

..There were 3 solving strategies compared: 1 method that formed and stored the coefficient matrix in memory and 2 methods that iterate on data. Finally, formulas for reliabilities of genomic predictions of merit were developed...

..Staphylococcus aureus and coagulase-positive staphylococci together accounted for 10 per cent of the samples with high somatic cell counts; 39 per cent produced no bacterial growth...

..Results validate quantitative genetic assumptions that most traits are due to the contributions of a large number of genes of small additive effect, rather than support the finite locus model...

..The result supports the hypothesis of an increase in the prevalence of positive dairy herds compared to previous years...

..The study results indicate that targeted sampling of cow alleyways and manure storage areas appears to be an alternative strategy for herd screening and Johne's infection status assessment and for estimating herd fecal prevalence...

..Genotypes from the Illumina BovineSNP50 BeadChip are of high accuracy and provide the basis for genomic evaluations in the United States and Canada...

..Some sequence types (STs; ST25, ST115, ST124, and ST126) demonstrated site specificity, as they were significantly (P < 0.05) associated with milk or teat skin...

..However, it also confirms the fact that attention must be maintained to avoid any emergence of such resistant bacteria...

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..the control dairy cattle, down to the genus level...

..simulans, was isolated only from three extramammary samples, indicating that Staph. simulans may be more specifically associated with mastitis. Consequently, the origin of CNS mastitis may vary depending on the causing CNS species...

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..05% in feed. Potential AFB1 binding agents should be evaluated experimentally to demonstrate efficacy. Our data show that sequestering agents can reduce AFM1 in milk of cows fed AFB1-contaminated feed...

..The results of this study have implications for surveillance and control policies for scrapie in goats...

..The LDRM was well suited for a first genome scan due to its approximately 8 times lower computational demands. Further fine mapping should be applied on the chromosomal regions of interest found in this study...

..Average milk SCC (5.32 log(10)/ml) for cows in which CNS was the only bacteria isolated was significantly higher than the average milk SCC (4.90 log(10)/ml) from cows with quarter milk samples that were bacteriologically negative...

..The goal of this study was to estimate the distribution of udder pathogens and their antibiotic resistance in Estonia during the years 2007-2009...

..Functional components of the somatotropic axis differed for the respective strains and were consistent with strain differences in milk production, BCS, and feed allowance...

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..05) in OP than in CP cows at 31 d and 102 d post partum. In conclusion, under Swiss conditions, subclinical mastitis is a greater problem in organic than in conventional production systems, but differences are not marked...

..In addition to the biological insights, these estimates also provide information for calibrating simulation models to assess control strategies for C. burnetii infection...

..When the information attributable to genomics can be expressed as modifications to the numerator relationship matrix, the proposed methodology may allow the upgrading of an existing evaluation to incorporate the genomic information...

..Tuberculosis reactor prevalences were higher in animals from the agro-pastoral zone. However, the individual-animal and herd prevalences of brucellosis seroprevalences were higher in the pastoral zone...

..The prospects for novel approaches to mastitis control are discussed, as are the current and future challenges facing the industry...

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..Identified positions can be incorporated into marker-assisted selection decisions to alter the persistency and peak production or the fluctuation of SCS during a lactation...

..aureus prevalence. For one herd, the model failed to mimic field observations. Explanations for the discrepancy are given in a discussion of current knowledge and model assumptions...

..aureus was likely due to higher prevalence of Staph. aureus as a whole, but for CNS, there was also an additional increase caused by a higher proportional rate of penicillin resistance during the late indoor season...

..To determine the survival of Escherichia coli O157:H7 in dairy wastewater from on-site holding lagoons equipped with or without circulating aerators...

..Anaerobic treatment resulted in fewer alterations, but significant decreases in the phyla Actinobacteria and Bacteroidetes, and increases in the phyla Planctomycetes, Spirochetes, and TM7 were observed...

..52%). Results indicated that SO and NOV at 0.56% of the diet were effective in reducing milk AFM(1) concentrations in cows consuming a total mixed ration containing 112 microg of AFB(1)/kg of diet DM...

..The relatively high power of this study can be attributed to the size of the experiment, to the QTL analysis with cofactors, and to the application of an appropriate FDR...

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..The results support the hypothesis that some S. aureus mastitis strains are more contagious, virulent or persistent than others. The human reservoir of S. aureus does not play a major role as a source of bovine intramammary infections...

..00 kg of milk/kg of concentrate for high durability) than the New Zealand strain (0.55 kg of milk/kg of concentrate). The results indicate that the optimum strain of HF will vary with feed system...

..The study shows the usefulness of the method to determine the identity of bovine Staphylococcus species, provided an identification framework updated with field isolates is available...

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..9% of herd-years (34.9% of cows) for 2005. Procedures for genetic evaluation of daughter pregnancy rate should be examined to determine if herd regimen for reproductive management affects results...

..For S. haemolyticus and S. simulans, the environment was found as a reservoir, suggesting that IMI with these species were possibly environmental in origin...

..However, some gene combinations suggest the possibility of the existence of variants or new types of MGEs...

..Opportunities to improve the accuracy of daughter pregnancy rate estimates may reside in models that adjust for VWP management decisions on a within-herd basis...

..4% of milk samples. Different strains were associated with variable persistence within quarters. MLST is clearly a very suitable tool for the differentiation and analysis of S. aureus populations detected on dairy cattle farms...

..CLINICAL RELEVANCE: Streptococcus canis infection may cause subclinical mastitis and high bulk SCC in dairy herds and be resolved by treatment with intramammary antibiotics and the introduction of strict hygiene practices...

..S. uberis was common in farm soil (31 of 35 samples) but not in non-farm soil (0 of 11 samples). We hypothesize that fecal shedding of S. uberis may play a role in maintenance of S. uberis populations in the dairy ecosystem...

..5-10); however, in contrast with PM(2.5-10) isolated from ambient air in the Central Valley of California, the active components in the insoluble fraction were heat-labile...

..Results from each method suggest that fecal shedding of Klebsiella is associated with transient rather than persistent presence of the organism in the gastrointestinal tract...

..The research indicates that specific dry-period management strategies have an important influence on the rate of clinical mastitis during the next lactation...

..21, estimated standard error = 0.22) for the lowest quartile. Reducing HV did not affect estimates of heritabilities or genetic correlations. Results indicated that modest evidence for existence of GxE did not arise solely from HV...

..These results can aid in the establishmentof selection programmes based on broad-based disease resistance, aimed at improving general health in cattle herds...

..Actions were rationalised in a specific context comprising the intertwined notions of intentions and efficacy beliefs...

..6.0 +/- 5.8 microg/m(3); PM(2.5) = 21.0 +/- 2.1 microg/m(3)). Personnel should be protected from high aerosol concentrations found at the commodity barn, compost field, and milking parlor during the winter...

New Zealand dairying farm systems are principally pasture-based or seasonal supply. Features of these systems and their management are described, together with their advantages and limitations...

..One year after implementation of these control measures, incidence of IMI caused by S aureus was 0.35 infections/100 cow months, and prevalence had decreased from 20 to 8%...

..However, further research is warranted to understand involvement of these metabolic changes on the long-term health and productivity of dairy cows...

..spp. Presence of coagulase-negative Staph. spp. or other pathogens was not associated with either of the outcome variables...

..Further research is warranted to understand the mechanism(s) by which rumen LPS and inflammatory responses to LPS lower milk fat synthesis and milk energy efficiency and to develop novel strategies for their prevention...

..For "any organism," using definition B raised the Sp to 88 and 93% in the 2 data sets, respectively. The final choice of definition will depend on the objectives of study or control program for which the sample was collected...

..Integrating fertility traits into a total merit selection index can halt or reverse the decline of fertility and improve the longevity of dairy cattle...

..There were also significant reductions of approximately 20 per cent in the incidence of clinical mastitis and in the occurrence of increases in the somatic cell counts of individual cows from below, to above 200,000 cells/ml...

..It is further concluded that certain combinations of extended clinical recordings have significant perspectives for future characterisation of udder health...

..Is this a sign for influence of Roman cattle on today's Swiss breeds?..

..To support decision making for udder health control, it is necessary to use a marginal approach, based on the comparison of the losses avoided and the additional costs of modified plans, compared to the existing ones...

..The mean somatic cell count of the uninfected milk samples was 428,000 cells/ml, and 93 percent of uninfected samples had counts less than 1,000,000 cells/ml; the mean cell count of the infected samples was 2,785,000 cells/ml...

..aureus is not uncommon. Penicillin is recommended for treatment of mastitis caused by gram-positive pathogens and regular monitoring of beta-lactamase production in S. aureus is therefore recommended in herds with udder health problems...

..The presence of long cubicles, knee-bumpers installed in cubicles as well as rearing calves and heifers within the dairy cows' accommodation decreased the odds of IDHE...

..Milking once daily is a viable milking option for New Zealand farmers who are prepared to trade-off loss of MS income for increased time to accomplish other non-milking activities...

..With proper management routines, it is possible to achieve a production level and animal well-being in AM systems that are at least as good as in conventional milking systems...

..Change toward a nonantimicrobial strategy was gradual and stepwise. All dairy producers in this study desired to preserve the possibility of using antimicrobial drugs in emergencies...

..The result should be improved animal health and well being, more efficient dairy production, and better models to predict nutritional requirements and provide rations to meet those requirements...

..Profitability and productivity did not seem to be major factors in producers' decisions to use or not use HRM practices...

..of Giardia and Cryptosporidium spp in calves born during two spring-calving seasons in a rapidly intensifying dairying region in the South Island; to evaluate potential correlations between the prevalence of the organism and age, ..

..The results are of importance for further understanding the mechanisms behind the increased content of FFA that is frequently observed in automatic milking systems...

..Reliabilities increased most for young bulls, and for clinical mastitis in countries that did not use the within-country correlations with SCC in the national evaluation (up to a 23% increase in average reliability)...

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..As new free stalls are being built, it is important to optimise the conditions for claw health...

..Our results demonstrate that UFM is a valid and efficient model for investigating the effects of frequent milking during early lactation in dairy cows...

..3d vs. 28.6d; SED = 1.76). In conclusion, once-daily milking in early lactation may promote earlier resumption of ovarian cyclicity, mediated through improved nutritional status...

..Reductions in the incidence of clinical mastitis were not accompanied by any clear changes in the prevalence of high MSCCs...

..The sensitivity, specificity, and positive predictive values of the tests were regarded as low when sampling for milk culture was conducted, irrespective of cow level characteristics...

..We found small differences between organic and conventional farm types in each country and larger differences between the two national agricultural systems...

..For accurate interpretations of SCC tests--whether by a laboratory, portable SCC device, or the California Mastitis Test--veterinarians, researchers, and udder health advisors should take milk samples immediately before milking...

..and E. coli IRCM than those in tie-stall barns. The focus of mastitis prevention and control programs should differ between regions and should be tailored to farms based on housing type and BMSCC...

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..The underlying mechanisms of some highlighted risk factors, such as milk production level and dietary management practices, should be investigated more thoroughly through international collaboration...

..The same association with test-day milk yield was found among Streptococcus spp.-positive pluriparous cows...

..This study demonstrated the potential benefits of a combined analysis of data from different granddaughter designs...

..016% of dietary dry matter) markedly inhibited milk fat synthesis (25% reduction) and that a curvilinear reduction in milk fat yield occurred with increasing quantities of trans-10, cis-12 CLA...

..8 m/year, at least locally. Since manure-treated fields represent by far the largest land area of the dairy, proper nutrient management will be a key to protecting groundwater quality in dairy regions overlying alluvial aquifers...

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..The herds participating in this study were all well managed herds, and the attitude towards treatment and production seemed to influence the IRVTCM more than environmental factors...

..However, the organic index would allow producers to rank proven bulls in accordance with their perceived needs...

..If consideration is to be given to reducing the risk of infection with this parasite, management must be a top priority, especially in younger animals...

..27). On a lactation basis, our results suggest that selection for mastitis resistance based on SCC is feasible. Patterns for genetic parameters within first lactation, however, require further confirmation and investigation...

..05) in the target herds (3.93 per cent) than in the control herds (2.27 per cent). No cause-and-effect relationships between location and multiple birth rate or location and stillbirth incidence were found...

..6%; p < 0.05)...

..Also, the milk-ELISA test with its current Se seemed to be profitable already after 2 years in high-prevalence herds using a test-&-cull strategy based on the milk-ELISA alone...

..00 US dollars under Danish production circumstances. These results are a step on the way to estimating the total cost of inbreeding depression to determine an acceptable rate of inbreeding...

..Completion of this research will validate a new in vivo model for luteolysis and provide insight into the interactions of specific gene expression cascades and signal transduction pathways during luteolysis. ..

..Ultimately, the products of this research will help inform the development and risk assessment of formulations that afford greater protection. ..

..Comparative analysis of interaction coefficients between the MCF and biological systems will provide some insight into dominant physicochemical interactions influencing dermal absorption of biocides in chemical mixtures. ..

..This experimental approach allows interaction models to be built which can be used to assess other workplace mixtures. ..

..Comparative analysis of interaction coefficients between the MCF and biological systems will provide some insight into dominant physicochemical interactions influencing dermal absorption of biocides in chemical mixtures. ..

..Results form these studies will provide the molecular basis of how Se deficiency can modify resistance to metabolic vascular disorders. ..

..This work will begin at the start of this project (Sept01). ..

..Our findings constitute stepping-stones for understanding and further studies of human neurological, mental, communication, and aging processes and disorders, giving rise to treatments and cures. ..

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..Completion of this research will validate a new in vivo model for luteolysis and provide insight into the interactions of specific gene expression cascades and signal transduction pathways during luteolysis. ..

..The proposed program will provide the forum by which the momentum in this field may be maintained. ..

..These studies will provide an unprecedented ..

..We will then develop materials and a promotion plan for one or more innovations that can be added to each of the two ongoing intervention efforts each year. We will begin this work at the start of this project (Sept99). ..