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During the period Nov. 1977 to Nov. 1979, 5 herds with high Wisconsin Mastitis Test (WMT) scores (>=16 mm) were studied. At the beginning of the trial, herds were visited by the authors, practices used on the farms were evaluated, and recommendations were made for correction of any deficiencies i...
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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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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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Bacterial counts were monitored for 1 yr in bedding materials used on nine commercial dairies. Organic materials used to bed lactating cows had significantly higher moisture content and gram-negative bacterial, coliform, Klebsiella species, and streptococcal counts than did inorganic materials. Kleb...
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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 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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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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Dairy replacement heifers given two strategic treatments with ivermectin (0.2 mg/kg) three and eight weeks after turnout to spring pastures in northern USA (Ohio) had mean adjusted weight gains (62.3 kg) that were 62% greater than those of control heifers (38.5 kg) at the time of winter housing. Pas...
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Eleven dairy replacement heifers (mean body weight 262 kg) were given two treatments with levamisole in the spring, 3 and 6 weeks after they had been moved from confinement to permanent pastures, at which time they were 5 to 12 months old. Treated heifers gained more weight than a group of 11 contro...
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The effect of 2 prophylactic treatments with albendazole (7.5 mg/kg) was evaluated in Ohio, USA, in 2 groups of Holstein dairy replacement heifers treated 3 and 6 weeks after turnout to spring pasture on May 2, 1983. The lightweight group consisted of twelve 7- to 9-month-old heifers with a mean ini...
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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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A stratified random sample of 50 Ohio dairy herds, monitored for 1 year between March 1988 and May 1989, was used to estimate the component costs of clinical mastitis per cow-year overall and by organism, the component costs of an episode of clinical mastitis overall and by organism, and the inciden...
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