The effect of a mastitis control system on levels of subclinical and clinical mastitis in two years

Kingwill, R. G.; Neave, F. K.; Dodd, F. H.; Griffin, T. K.; Westgarth, D. R.; Wilson, Claire

doi:10.1136/vr.87.4.94

Cited by 99 publications

(28 citation statements)

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“…Since the 1960s, in order to control the risk of new IMI after drying-off, and also to try to eliminate existing IMI, a blanket dry cow antibiotic treatment (blanket DCT) has been recommended at drying-off for all cows, as a component of the "5 Points Mastitis Control Plan" [19,36,49,51]. Blanket DCT is today widely implemented, with an adoption rate ranging from 75 to 99% depending 26 A.…”

Section: Introductionmentioning

confidence: 99%

Incidence of intramammary infections during the dry period without or with antibiotic treatment in dairy cows – a quantitative analysis of published data

2006

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-The study was aimed at summarising the literature that compares the incidence levels of spontaneously occurring intramammary infections (IMI) during the dry period, without versus with antibiotic dry cow treatment (DCT). A meta-analytic relative risk (RR) calculation was implemented when a priori relevant. Two main categories of comparison were used in the 36 selected papers. In the first category, the udder quarters were randomly allocated (at quarter or cow level) to an untreated or a treated group. Quarter incidence averaged 12.8% (weighted mean) in untreated quarters, and depending on the DCT used, from 6.6 to 8.0% in treated quarters. The meta-analytic RR of new IMI for untreated versus treated quarters varied from 1.54 to 1.94, depending on the DCT used. DCT was mainly found effective against IMI due to streptococci and coagulase-positive staphylococci. Based on only a few papers, the application of an internal teat sealer was associated to a quite similar (or possibly better) protection against IMI than DCT, but only in a subpopulation of particular (selected) cows. In the second category of studies, a selective dry cow or quarter antibiotic-treatment (selective DCT or DQT), according to cow or quarter selection criteria, was compared to blanket DCT. The meta-analytic RR of new IMI was 1.71 for selective DCT versus blanket DCT. Selective DQT seemed to be more at risk than selective DCT, but consisted of treating a much lower proportion of quarters. The summary-results provided by our meta-analysis should only be used with caution, due to possibly low external validity. More research seems to be relevant on the risk factors of new IMI during the dry period to make the outcomes of omission of DCT in selected cows more predictable under field conditions. dairy cow / mastitis / risk / dry-cow treatment / meta-analysis

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Section: Introductionmentioning

confidence: 99%

Incidence of intramammary infections during the dry period without or with antibiotic treatment in dairy cows – a quantitative analysis of published data

2006

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“…Mastitis control field trials lasting for at least two years, in which clinical mastitis was reCorded and regular milk cell counts were made in conjunction with bacteriological examination are reported from England -Reading/ Weybridge MFE3 (8,14), USA-Cornell (10, 11), USAPennsylvania (3), Israel (15), New South Wales (6,9), and Irerand (2).…”

Section: Introductionmentioning

confidence: 99%

Effects of a mastitis control programme on the incidence of clinical mastitis

Verhoeff

Geer²,

Hagens³

1981

Veterinary Quarterly

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SUMMARYThe results of a mastitis control field experiment in Utrecht over three and a half years, including sevens herds with a total of 225 lactating cows are presented. Every case of clinical mastitis was examined bacteriologically. Quarter samples were taken routinely at an average interval of five weeks. The incidence of clinical mastitis in each herd at the start of the experiment varied from 10 to 104 quarter cases per 100 cows per year. The majority of cases of clinical mastitis (33.1 per cent) occurred during the first month of lactation. In 74.4 per cent of the lactations marked by clinical mastitis only a single case was observed during that lactation period. If the animals were on pasture during the first month of lactation, the incidence of clinical mastitis was significantly lower during this month, compared with the first month when they were housed.Str. dysgalactiae was the most common isolate from clinical cases (21.5 per cent). A total proportion of 40.3 per cent of the clinical cases were caused by cocci, 20.3 per cent by Gram-negative bacteria and 16.0 per cent were bacteriologically negative. Of the clinical cases caused by streptococci and staphylococci, 33.3 per cent were preceded,by subclinical infection, compared with 11.8 per cent of the clinical cases due to E. coli. The overall incidence of clinical mastitis in this experiment decreased from 47 to 31 per 100 cows per year.

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“…Teat dipping is assessed as one of the most important investments applied in prevention of bovine mastitis, and is an essential part of the five point plan (Kingwill et al, 1970). Not all types of intramammary infections are reduced equally by germicidal teat dips (Natzke, 1977;Farnsworth et al, 1980).…”

Section: Introductionmentioning

confidence: 99%

The influence of iodine teat dipping and an external teat sealant in heifers on bacterial isolation from quarter milk culture obtained post-calving

Østerås

Whist

Sølverød³

2008

Livestock Science

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The effect of a mastitis control system on levels of subclinical and clinical mastitis in two years

Cited by 99 publications

References 0 publications

Incidence of intramammary infections during the dry period without or with antibiotic treatment in dairy cows – a quantitative analysis of published data

Incidence of intramammary infections during the dry period without or with antibiotic treatment in dairy cows – a quantitative analysis of published data

Effects of a mastitis control programme on the incidence of clinical mastitis

The influence of iodine teat dipping and an external teat sealant in heifers on bacterial isolation from quarter milk culture obtained post-calving

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