Genetic and environmental causes of variation in mastitis in sheep

Larsgard, Anne Guro; Vaabenoe, A.

doi:10.1016/0921-4488(93)90069-t

Cited by 29 publications

(22 citation statements)

References 7 publications

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“…We have assumed that lamb weight is primarily dependent on ewe milk production after adjustment for known confounders, such as litter size and birth weight, particularly in young lambs with no rumen and no other source of food. Other authors have also used lamb weight as a proxy for milk production and linked this to clinical and subclinical mastitis (Larsgard and Vaabenoe, 1993;Moroni et al, 2007;Arsenault et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…In suckler sheep, reduction in milk yield reduces lamb growth rate: lambs reared by ewes experimentally infected with Staphylococcus simulans to induce subclinical infection had significantly lower growth rates to 52 d of age than lambs reared by unchallenged ewes (Fthenakis and Jones, 1990). In observational studies, clinical mastitis (Larsgard and Vaabenoe, 1993) and subclinical mastitis (either defined by presence of bacteria or positive CMT) have been associated with reduced growth rate of lambs Arsenault et al, 2008) although supplementary feed to lambs negated this association (Keisler et al, 1992), suggesting that these IMI reduce milk production.…”

Section: Introductionmentioning

confidence: 99%

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A cohort study of the associations between udder conformation, milk somatic cell count, and lamb weight in suckler ewes

Huntley

Cooper

Bradley

et al. 2012

Journal of Dairy Science

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A cohort study of 67 suckler ewes from 1 farm was carried out from January to May 2010 to investigate associations between udder conformation, udder half milk somatic cell count (SCC), and lamb weight. Ewes and lambs were observed at lambing. Ewe health and teat condition and lamb health and weight were recorded on 4 to 5 further occasions at 14-d intervals. At each observation, a milk sample was collected from each udder half for somatic cell counting. Two weeks after lambing, ewe udder conformation and teat placement were scored. Low lamb weight was associated with ewe SCC >400,000 cells/mL (−0.73 kg), a new teat lesion 14 d previously (−0.91 kg), suboptimal teat position (−1.38 kg), rearing in a multiple litter (−1.45 kg), presence of diarrhea at the examination (−1.19 kg), and rearing by a 9-yr-old ewe compared with a 6-yr-old ewe (−2.36 kg). High lamb weight was associated with increasing lamb age (0.21 kg/d), increasing birth weight (1.65 kg/ kg at birth), and increasing number of days the ewe was given supplementary feed before lambing (0.06 kg/d). High udder half SCC was associated with pendulous udders (9.6% increase in SCC/cm of drop) and greater total cross-sectional area of the teats (7.2% increase of SCC/cm 2 ). Low SCC were associated with a heavier mean litter weight (6.7% decrease in SCC/kg). Linear, quadratic, and cubic terms for days in lactation were also significant. We conclude that poor udder and teat conformation are associated with high levels of intramammary infection, as indicated by increased SCC and that both physical attributes of the udder and SCC are linked to lamb growth, suggesting that selection of suckler ewes with better udder and teat conformation would reduce intramammary infection and increase lamb growth rate. Figure 1. Teat placement scores: 1 (most medial) to 9 (most lateral; source, Casu et al., 2006).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A cohort study of the associations between udder conformation, milk somatic cell count, and lamb weight in suckler ewes

Huntley

Cooper

Bradley

et al. 2012

Journal of Dairy Science

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“…Acute mastitis occurs in approximately 5% of lactating ewes annually, and it usually occurs either soon after lambing or when lambs are 3-4 months old (Lasgard and Vaabenoe, 1993). Subclinical mastitis occurs in 4-50% of lactating ewes (Kirk and Glenn, 1996).…”

Section: Lyme Disease (Borrelia Burgdorferi Infection Borreliosis)mentioning

confidence: 99%

Biology and Diseases of Ruminants: Sheep, Goats, and Cattle

Delano¹,

Mischler²,

Underwood³

2002

Laboratory Animal Medicine

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“…The aforementioned pathogens can be broadly classified as contagious and environmental based on their virulence and origin. In any case and irrespectively of the causative pathogen, many environmental and genetic factors have been found to predispose to mastitis in sheep (Larsgard and Vaabenoe, 1993).…”

Section: Introductionmentioning

confidence: 99%

Predisposing factors and control of bacterial mastitis in dairy ewes

Bramis

Gelasakis

Kiossis

et al. 2018

J Hellenic Vet Med Soc

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ABSTRACT. Bacterial mastitis is a major health problem in dairy sheep worldwide. It is associated with reduced milk yield and occasionally involuntary culling of affected ewes, as well as insufficient growth and mortality of lambs. In general, the incidence of clinical mastitis in ewes during lactation is lower than 5%. However, the prevalence of subclinical mastitis is variable ranging from 10-30% or more. In clinical cases of bacterial intramammary infections, Staphylococcus aureus is dominant. In the case of subclinical mastitis the prevailing isolates are Coagulase-Negative Staphylococci (CNS). Moreover, predisposing factors related to the environment, genetics, udder morphology and nutrition, are likely to contribute to the occurrence of mastitis. Hence, control of the latter factors and bacteriological contamination during milking are the main preventive measures. The notion is that detection of the ovine genome regions involved in mastitis resistance will also facilitate the most effective control of mastitis in flock level. Appropriate genetic selection, together with the implementation of preventive measures, could reduce the negative consequences of bacterial mastitis.

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Genetic and environmental causes of variation in mastitis in sheep

Cited by 29 publications

References 7 publications

A cohort study of the associations between udder conformation, milk somatic cell count, and lamb weight in suckler ewes

A cohort study of the associations between udder conformation, milk somatic cell count, and lamb weight in suckler ewes

Biology and Diseases of Ruminants: Sheep, Goats, and Cattle

Predisposing factors and control of bacterial mastitis in dairy ewes

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