Incidence and Importance of Subclinical Mastitis in Sheep

Gross, Susan J.; Pollak, Edward; Anderson, John G.; Torell, D. T.

doi:10.2527/jas1978.4611

Cited by 41 publications

(22 citation statements)

References 3 publications

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“…Overall mastitis incidence of 11.5% in this experiment is similar to the 10% value reported by Gross et al (1978) in a flock of purebred Targhee ewes.…”

Section: Resultssupporting

confidence: 87%

“…Ewes free of mastitis produced 11.5% more milk than ewes with mastitis in only one half of the udder and 58.3% more milk than ewes infected in both halves. Gross et al (1978) reported that CMT scores recorded at lambing had no significant association with lamb weaning weight but that scores taken 3 to 7 weeks later approached a significant negative relationship to weaning weight (P<.10). The same trend was found 6 Milk samples representing early lactation were accidentally lost during laboratory analysis.…”

Section: Resultsmentioning

confidence: 94%

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Relationships between Ewe Milk Production and Composition and Preweaning Lamb Weight Gain

Torres-Hernández

Hohenboken

1980

Journal of Animal Science

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“…Overall mastitis incidence of 11.5% in this experiment is similar to the 10% value reported by Gross et al (1978) in a flock of purebred Targhee ewes.…”

Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 94%

Relationships between Ewe Milk Production and Composition and Preweaning Lamb Weight Gain

Torres-Hernández

Hohenboken

1980

Journal of Animal Science

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“…Because of the severity of the isolated pathogens in summer, overall incidence of clinical mastitis was higher in these summer months compared to spring. Our result was lower than those of Gross et al (1978) and Lafi et al (1998) that reported 1.6 and 1.7, respectively.…”

Section: Fig 2 Bacterial Species Isolated From Subclinical Mastitis contrasting

confidence: 85%

Prevalence and etiology of subclinical mastitis in dairy ewes in two seasons in Semnan province, Iran

Sani

Mahdavi

Moezifar

2015

Trop Anim Health Prod

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Twenty-one dairy ewe flocks selected by stratified random sampling were subjected to study the prevalence and etiology of subclinical intramammary infections and to assess the influence of parity on the prevalence of intramammary infections. Also, spontaneous cure rates were determined over study period. A total of 1192 milk samples were collected at 2 weeks after lambing until tenth-week postpartum. All flocks had hand milking; those which were classified by bacterial culture and California Mastitis Test (CMT) as positive were deemed to have glands with subclinical mastitis (SCM). Of 1192 halves examined, 791 samples were collected during spring and 401 samples were collected during summer. Prevalence rate of SCM in spring was 14.7 %; and spontaneous cure that occurred in this season was 88.8 %; coagulase-negative staphylococci (CNS) were the most common isolates (66.6 %). Samples collected in spring showed higher prevalence rate of SCM than summer samples. This rate was 8.9 % in summer. Spontaneous cure rate in this season was 69.4 %, and Staphylococcus aureus (72.2 %) was the most common isolates. SCM was seen at significantly lower rates in left half than in right one (p < 0.05). Multiparous ewes had significantly higher (p < 0.05) SCM prevalence rates than primiparous ewes. The incidence of clinical mastitis (defined as number of clinical cases per 100 ewe-months) was 0.21 and 0.74 in spring and summer, respectively. The isolates from clinical cases in spring were fungi and, from summer, were S. aureus. Also, S. aureus SCM cases were not significantly severe than other SCM cases. In conclusion, multiparous ewes were most at risk, and severity of infection was higher in summer.

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“…Embora a mastite clínica seja responsável por perdas expressivas, a mastite subclínica tem elevada importância econômica em decorrência dos prejuízos na produção e é de maior ocorrência (Gross et al 1987, Marco Melero 1994. Estima-se que as perdas na produção de leite de cabras portadoras de mastite subclínica possam variar de 55 a 132 kg de leite/ano e uma redução de 3g de gordura/ kg leite por animal .…”

Section: Introductionunclassified

Perfil microbiológico, celular e fatores de risco associados à mastite subclínica em cabras no semiárido da Paraíba

et al. 2010

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A subclinical mastitis study was conducted in nine dairy goat herds in the semi-arid region of Paraíba state, Northeastern Brazil, to determine the occurrence of infection, to evaluate microbiological and cellular profiles of the milk, to test the sensitivity of isolated microorganisms to antimicrobials, and to identify risk factors. One hundred thirty-one dairy goats were used, 261 samples were collected for microbiological culture and 131 samples for somatic cells count (SCC). During collection, the California Mastitis Test (CMT) was conducted and an epidemiological questionnaire was applied for each herd. There was bacterial growth in 30 samples (11.49%), with 25 (83.33%) coagulase-negative Staphylococcus and five (16.66%) Staphylococcus aureus isolated. The SCC mean was 1.39x10 6 cells/ml. CMT presented low sensitivity (46.7%) and low specificity (60.6%) compared with microbiological culture. Gentamicin and the association of neomycin, bacitracin and tetracyclin were the antimicrobials against which the microorganisms isolated showed 100% sensitivity. Penicillin and ampicillin had the greatest resistance rates (66.67% and 63.89%, respectively). Goat breeding is not the main activity on the farms and do not isolate diseased animals were identified as risk factors for caprine subclinical mastitis. Program for the control and prophylaxis of mastitis must be implemented focusing primarily on hygiene cares at milking and correction of the risk factors identified in this study.

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Incidence and Importance of Subclinical Mastitis in Sheep

Cited by 41 publications

References 3 publications

Relationships between Ewe Milk Production and Composition and Preweaning Lamb Weight Gain

Relationships between Ewe Milk Production and Composition and Preweaning Lamb Weight Gain

Prevalence and etiology of subclinical mastitis in dairy ewes in two seasons in Semnan province, Iran

Perfil microbiológico, celular e fatores de risco associados à mastite subclínica em cabras no semiárido da Paraíba

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