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152 quarter milk samples were examined microbiologically before and after storing at -80 deg C for 7 and 14 days. The total number of isolates from fresh milk (107) was higher than from frozen milk stored for 7 or 14 days (97 and 94 resp.). Similar numbers of staphylococci were isolated from fresh a...
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A stratified random sample of Ohio dairy herds was studied to relate herd management and environmental conditions to the prevalence of intramammary infection with coagulase-negative staphylococci. Management and environmental conditions were assessed by investigator observation and by interview with...
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Two groups of 22 heifers were examined rectally for corpus luteum (CL) development. 14 cows from each group with CLs at the 5-16 day stage were injected with prostaglandin F2 alpha (PGF2 alpha ; 25 mg i/m), the remaining 8 in each group were given the same treatment 11 days later. All the heifers we...
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Nine dairy herds (mean size, 149 cows) with bulk-tank milk somatic cell counts of 80% of cows with Dairy Herd Improvement Association linear somatic cell counts >= 4 were selected for study. Each herd was monitored for 12 consecutive months. Duplicate quarter-milk specimens were collected from ea...
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Fifty Ohio dairy farms selected by stratified random sample were monitored to determine the incidence rate of clinical mastitis and prevalance of intramammary infection with the major intramammary pathogens. Population parameters for clinical mastitis incidence rate were estimated as 2.19, 3.33 and ...
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43 farmers with milk showing positive Wisconsin mastitis test results were divided into 3 groups: group (i) had an extension meeting on mastitis plus four 3-monthly visits to their farms; group (ii) had meeting but no farm visit; and group (iii) were given no information. During 1 yr incidence of ma...
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A deficiency of plasma thromboplastin antecedent (Factor XI) was detected in a cow which subsequently died from adult multicentric leucosis and lymphoblastic leucaemia. The possibility that the deficiency was familial was raised by the discovery of a paternal half-sister with an indistinguishable cl...
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Dairy herds in Ohio were selected by stratified random sampling for participation in a disease-monitoring study to relate S. agalactiae intramammmary prevalence to herd management and environmental conditions. Of 48 herds studied, 27 herds had at least 1 cow infected with this pathogen. Management a...
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The objective of this report is to present preliminary results from a postal survey carried out in the USA of farmers and herds that were participants in the DHIA somatic cell count option (DHI-SCC), and members of Milk Marketing Inc. (MMI) regarding their use of mastitis control practices. Four are...
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Forty-eight herds participating in the 1988/1989 Ohio National Animal Health Monitoring System dairy project were monitored for 1 year to determine the effects of environment and management on mortality in preweaned calves. Environmental factors were evaluated by veterinarians during monthly visits ...
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Factors associated with bulk tank milk bacterial and somatic cell counts were investigated for 1 yr on 9 well managed dairies. Geometric mean total bacterial count among dairies was 4.4 x 10superscript 3 c.f.u./ml. Geometric mean bulk tank milk somatic cell count among herds was 265 x 10superscript ...
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The value of herd somatic cell counts (SCC) in evaluating mastitis control programmes is pointed out; in conjunction with DHIA measures, a herd SCC programme should enable farmers to maintain SCC at less than 500 000/ml in 90% of cows. High individual cow SCC are discussed as indicators for culling,...
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Three projects recently funded by the American Veterinary Medical Association (AVMA) through the National Commission on Veterinary Economic Issues (NCVEI) focused on the veterinary school applicant pool, leadership skills in the veterinary profession, and a veterinary teaching hospital business mode...
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The use of a single bulk tank milk culture and a single milk filter culture was studied for their suitability as screening tests for coagulase-positive staphylococci and Streptococcus agalactiae. Bulk tank and bulk tank milk filter cultures were compared to quarter milk cultures taken from individua...
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Factors that influence the type of antibiotics therapy used to treat mastitis are discussed and include: site of infection and resistance to chemotherapeutic agents; evaluation of the whole animal and its environment; and pharmacokinetics of the administered drug. Some practical aspects of mastitis ...
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This article discusses the occurrence and diagnosis of mycoplasma mastitis, particularly in Ohio, USA. Potential sources of infection are summarized. Antibiotics therapy has had limited success in the control of mycoplasma mastitis. Early diagnosis, followed by isolation or slaughter appears to be t...
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A stratified-random sample of 48 Ohio dairy herds participated in a 1-year disease monitoring survey to study herd management and environmental conditions affecting udder infection and clinical mastitis incidence. The mean monthly bulk-tank somatic cell count was used as an indicator of overall udde...