The Role of Coagulase-Negative Staphylococcus spp. and Associated Somatic Cell Counts in the Ovine Mammary Gland

Pengov, A.

doi:10.3168/jds.s0022-0302(01)74509-2

Cited by 84 publications

(82 citation statements)

References 10 publications

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“…This makes it more difficult to choose a threshold to discriminate between healthy and infected udders, which can be worldwide accepted. Some researchers (Fthenakis et al, 1991;Jones, 1991) reported discrimination values between healthy and infected glands ranging from 500 to 1600 × 10 3 cells/mL, while others (Bergonier et al, 1994;De la Cruz et al, 1994;Pengov, 2001) reported values similar to those for cows (200-300 × 10 3 cells/mL). González-Rodríguez et al (1995) suggested that breed differences in SCC do exist.…”

Section: Scc In Sheepmentioning

confidence: 98%

Genetic selection for reduced somatic cell counts in sheep milk: A review

Riggio

Portolano

2015

Small Ruminant Research

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a b s t r a c tMastitis is an inflammation of the udder, mainly caused by bacteria, and leads to economic loss, due to discarded milk, reduced milk production, reduced milk quality and increased health costs in both dairy sheep and cattle. Selecting for increased genetic resistance to mastitis can be done directly or indirectly, with the indirect selection corresponding to a prediction of the bacteriological status of the udder based on traits related to the infection. The most frequently used indirect method is currently milk somatic cell count (SCC) or somatic cell score (SCS). This review reports the state of the art relating to the genetic basis of mastitis resistance in sheep and explores the opportunities to use SCC as selection criterion in a breeding programme to improve resistance to mastitis in sheep, discussing the actual situation and prospects for improvement. It has been stressed, in particular, that although it is unlikely that selection for mastitis resistance by the farmers on their own will be successful, there is good prospect for genetic improvement if reliable pedigree and performance recording is implemented across flocks, combined with breeding value estimation. To achieve this, a strong and well-structured organization to implement and support the programme is essential.

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Section: Scc In Sheepmentioning

confidence: 98%

Genetic selection for reduced somatic cell counts in sheep milk: A review

Riggio

Portolano

2015

Small Ruminant Research

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“…In ewes of milk breeds, the physiological and pathological levels of somatic cells in milk range from 0.25 to 1.0 × 10 6 cells/ml (El-Saied et al, 1998;Pengov, 2001). Some authors state that the threshold between health and disease of an udder half in ewes is an SCC of 250-300 × 10 3 /ml (Pengov, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Some authors state that the threshold between health and disease of an udder half in ewes is an SCC of 250-300 × 10 3 /ml (Pengov, 2001). The milk of line 05 dairy ewes (milk yield is approx.…”

Section: Introductionmentioning

confidence: 99%

Milk yield and composition in line 05 dairy ewes as related to somatic cell counts

Olechnowicz¹,

Jaśkowski²,

Antosik³

et al. 2009

J. Anim. Feed Sci.

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A total of 1512 milk samples from udder halves was collected at monthly intervals from 189 line 05 dairy ewes throughout milking periods. Each ewe was tested 4 times. Milk composition was examined in terms of somatic cell contents (SCC) in ewe milk in three groups: group 0 consisted of ewes that on each test day had ≤250 × 10 3 cells/ml in left and right udder halves, group 1 comprised ewes with ≤250 × 10 3 in one half of the udder and >250 × 10 3 cells/ml in the other half, whereas group 2 contained ewes that had >250 × 10 3 cells/ml in the left and right udder halves (also on each test day). SCC in milk from one or both halves of udders exceeding 250 × 10 3 cells/ml resulted in a statistically significant (P<0.01), 20.7%, decrease in daily milk production.Correlation coefficients between SCC and fat and protein percentages in milk were positive and equaled 0.24 and 0.18, respectively. A negative value of the correlation coefficient was recorded between log SCC and lactose percentage (-0.49).

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“…As glândulas mamárias foram consideradas positivas para a mastite subclínica quando apresentavam qualquer escore positivo ao California Mastitis Test (CMT) e com contagem de células somáticas (CCS) superior a 250.000 células / mL de leite (8) , em conjunto com o isolamento microbiológico. A interpretação dos resultados dos exames microbiológicos foi conduzida de acordo com Pradieé et al (9) , com crescimento simultâneo das colônias bacterianas nas duas amostras de leite colhidas de cada metade mamária.…”

Section: Methodsunclassified

Persistência De Staphylococcus Coagulase-Negativos Em Glândulas Mamárias De Ovelhas Com Mastite Subclínica Após O Tratamento Antimicrobiano À Secagem

et al. 2017

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ResumoStaphylococcus coagulase-negativos (SCN) são os principais micro-organismos responsáveis pela mastite ovina e o tratamento ao final da lactação pode ser usado como método de controle contra a doença. Porém, o longo período seco apresentado pelas ovelhas em alguns sistemas de criação pode prejudicar os efeitos positivos do tratamento antimicrobiano. Os objetivos deste trabalho foram identificar as principais espécies de SCN na etiologia da mastite ovina antes e após o tratamento ao final da lactação das ovelhas, bem como investigar a persistência das espécies mais prevalentes na glândula mamária na lactação seguinte. Sessenta ovelhas foram divididas em dois grupos experimentais, um deles formado por animais sem tratamento antimicrobiano, enquanto o outro era composto por ovelhas cujas metades mamárias foram tratadas com cloxacilina-benzatina por via intramamária. As amostras de leite foram obtidas antes da secagem e aos 15 e 30 dias após o parto da lactação seguinte. As espécies prevalentes foram S. warneri, S. simulans e S. epidermidis. Clones das três espécies de maior ocorrência foram identificados antes e depois do tratamento, ou seja, mesmo com o extenso período seco entre as duas lactações consecutivas, os micro-organismos ainda foram identificados no interior da glândula mamária. Palavra-chave: bacteriologia; glândula mamária; leite ovino; métodos de controle da mastite. AbstractCoagulase-negative Staphylococci (CNS) are the main microorganisms responsible for mastitis in sheep and the treatment in the end of lactation can be used as a control method against disease. However, the long dry period presented by ewes in some breeding systems may impair the positive effects of antimicrobial treatment. The aims of this study were to identify the main CNS species in the etiology of ovine mastitis before and after treatment at dry-off of the ewes, as well as investigate the persistence of the most prevalent species in the mammary gland at the next lactation. Sixty sheep

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The Role of Coagulase-Negative Staphylococcus spp. and Associated Somatic Cell Counts in the Ovine Mammary Gland

Cited by 84 publications

References 10 publications

Genetic selection for reduced somatic cell counts in sheep milk: A review

Genetic selection for reduced somatic cell counts in sheep milk: A review

Milk yield and composition in line 05 dairy ewes as related to somatic cell counts

Persistência De Staphylococcus Coagulase-Negativos Em Glândulas Mamárias De Ovelhas Com Mastite Subclínica Após O Tratamento Antimicrobiano À Secagem

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