A field investigation of subclinical mastitis in sheep in southern England

Watkins, G.; Burriel, Angeliki R.; Jones, J.E.T.

doi:10.1016/0007-1935(91)90083-y

Cited by 74 publications

(44 citation statements)

References 5 publications

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“…The majority of authors reported an association between mastitis and teat lesions ( [4,20,31,32,58], Onash et al 2 ), which are usually manifested as an outbreak [5,20,58]; furthermore, Watt [71] and Reid [59] mentioned that a possible secondary effect of orf was mastitis of the affected ewes. Nevertheless, authors did not report such an association [2,70]. To our knowledge however, no experimental findings regarding these hypotheses have been published.…”

Section: Discussionmentioning

confidence: 85%

Teat disorders predispose ewes to clinical mastitis after challenge with Mannheimia haemolytica

et al. 2006

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-In order to study the effects of sheep teat disorders on the protection of the mammary gland, we used a Mannheimia haemolytica isolate, which did not cause clinical mastitis when deposited into intact teats. In the first experiment, this was deposited into the duct of teats with orf (Group A, n = 5) or papilloma (Group B, n = 3). In the second, teats were chapped and then, the organism was deposited into the duct (Group C, n = 7) or on the skin (Group D, n = 4). Ewes with healthy teats were controls (Group E, deposition into duct, n = 5; Group F, deposition on skin, n = 2). The ewes in Groups A, B or C developed clinical mastitis 5 h later, whilst the ewes in Group D developed it 2 d later; no control ewe developed clinical mastitis. In ewes with teat lesions, the organism was isolated from secretion samples and the California Mastitis Test became positive 5 h after challenge; neutrophils and lymphocytes were seen in Giemsa-stained secretion films from Group A or B ewes, whilst macrophages, neutrophils and lymphocytes in films from Group C or D ewes; neutrophils were predominating in films from Group E or F ewes. Inside the teats of Group A, B, C or D ewes, folds, hyperaemia and mucosal thickness were seen; histologically, subepithelial leucocytic infiltration was seen. In Group A or B ewes, no evidence of lymphoid tissue at the teat duct-cistern border was found. In Group C or D ewes, intense erosion and ulceration of the teat skin and conspicuous lymphoid tissue at the teat duct-cistern border, were evident; lesions characteristic of haemorrhagic mastitis were in the mammary parenchyma. In control ewes, subepithelial leucocytic infiltration in the teat duct and lymphoid tissue as above, were evident. We postulate that teat lesions can be predisposing factor to mastitis, by adversely affecting defences and speeding the process of infection and making it more severe. mastitis / sheep / teat / predisposing factor / orf

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Section: Discussionmentioning

confidence: 85%

Teat disorders predispose ewes to clinical mastitis after challenge with Mannheimia haemolytica

et al. 2006

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“…As a consequence, the udders of meat ewes are 48 exposed to many pathogens over a lifetime, and the prevalence of sub-clinical infection is estimated 49 to range from 5.5 to 7.0% in the UK (Watkins et al, 1991) and is 28.8% in Canada (Arsenault et al,50 2008). 51…”

mentioning

confidence: 99%

Short communication: Preliminary investigation into the effect of freezing and a cryopreservant on the recovery of mastitis pathogens from ewe milk

Smith

Monaghan

Huntley

et al. 2011

Journal of Dairy Science

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The objective of this study was to investigate the recovery of bacteria from ewe milk after freezing 28 for 4 or 8 weeks with and without the addition of glycerol as a cryopreservant. A total of 50 udder-29 half milk samples with a known range of bacterial species were selected, stored and analyzed in 5 30 treatment-groups: time zero, frozen for 4 weeks with, and without, glycerol; and frozen for 8 weeks 31with, and without, glycerol. There was a lower recovery of all bacterial species studied after 32 freezing. Samples containing fewer than 100 cfu/mL came from ewes with a lower somatic cell 33 count and were more likely to be bacteriologically negative after freezing than those above this 34threshold. The addition of glycerol increased recovery of Gram-negative bacteria after freezing, 35 although this requires further study to draw strong conclusions. The effects on Gram-positive 36 species were inconsistent. We conclude that whilst the addition of glycerol had a small beneficial 37 impact on the sensitivity of detection of bacteria from frozen sheep milk, sensitivity was highest in 38 cultures from fresh milk. 39 40

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“…Deste modo, quase não houve mudanças no quadro infeccioso da glândula mamária ovina. Concordante a isto, Watkins et al (1991), Leitner et al (2001) e Al-Majali & Jawabreh (2003 reportaram que a prevalência da infecção permaneceu constante durante toda a lactação, apesar de Hueston et al(1986a) e Al-Samarrae et al(1985) terem relatado que a prevalência aumenta. Isto no entanto, pode ser devido aos diferentes meios diagnósticos utilizados, o que dificulta comparações entre os estudos.…”

Section: Discussionunclassified

“…Todas as amostras positivas nas provas bacteriológi- (Hueston et al 1986a, Bor et al 1989, Watkins et al 1991, Kirk et al 1996, Menzies & Ramanoon 2001, Ariznabarreta et al 2002, Bergonier et al 2003, Contreras et al 2007). As infecções por estes patógenos geralmente persistem do período seco até a próxima lactação (Poutrel 1984, Nickerson 1987.…”

Section: Discussionunclassified

“…Staphylococcus aureus, Streptococcus spp., Manhemia haemolytica, Pseudomonas aeroginosa, Enterobacteriaceae spp., Corynebacteria spp., Micrococci spp. e alguns fungos, são também identificados como patógenos causadores de mastite crônica nestes animais (Al-Samarrae et al 1985, Watkins et al 1991, Della Libera et al 2007). Ao avaliar a susceptibilidade microbiana frente a diferentes antimicrobianos, observou-se uma boa sensibilidade destes microrganismos.…”

Section: Discussionunclassified

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Perfil celular e microbiológico do leite de ovelhas Santa Inês no período lactante e pós-desmame

et al. 2008

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O objetivo deste trabalho foi avaliar o perfil microbiológico e celular do leite no período lactante e de involução ativa de ovelhas da raça Santa Inês. Foram avaliadas amostras lácteas de 12 ovelhas durante estes distintos períodos. Realizou-se o exame físico da mama, sendo as amostras lácteas submetidas à contagem de células somáticas (CCS), ao California Mastitis Test (CMT), ao exame microbiológico e aos testes de sensibilidade in vitro dos patógenos encontrados. Foram observados maiores escores do exame físico, CCS, CMT durante o período de involução ativa, além de uma alta persistência da infecção durante estes períodos. O período de involução ativa não se mostrou como um momento de alta susceptilidade. Os estafilococos coagulase negativa representaram o único gênero isolado das glândulas infectadas. Uma alta sensibilidade dos agentes etiológicos envolvidos frente aos diferentes antimicrobianos in vitro foi também observada.

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A field investigation of subclinical mastitis in sheep in southern England

Cited by 74 publications

References 5 publications

Teat disorders predispose ewes to clinical mastitis after challenge with Mannheimia haemolytica

Teat disorders predispose ewes to clinical mastitis after challenge with Mannheimia haemolytica

Short communication: Preliminary investigation into the effect of freezing and a cryopreservant on the recovery of mastitis pathogens from ewe milk

Perfil celular e microbiológico do leite de ovelhas Santa Inês no período lactante e pós-desmame

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