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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...