Association between species-specific staphylococcal intramammary infections and milk somatic cell score over time in dairy goats

Gosselin, Véronique Bernier; Dufour, Simon; Middleton, John R.

doi:10.1016/j.prevetmed.2019.104815

Cited by 5 publications

(8 citation statements)

References 21 publications

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“…As a group, NAS-infected goats had an overlap in SCC confidence intervals with culturenegative goats in the current study. However, because NAS are a heterogeneous group of bacterial species, effects of some more pathogenic species can be elucidated by species with less effect on udder health (Koop et al, 2012;Bernier Gosselin et al, 2020). Species-level studies of NAS in goats have only been performed in a low number of herds.…”

Section: Smistad Et Al: Scc and Udder Pathogens In Norwegian Dairy Goatsmentioning

confidence: 99%

Distribution of somatic cell count and udder pathogens in Norwegian dairy goats

Smistad

Sølverød

Inglingstad

et al. 2021

Journal of Dairy Science

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Compared with dairy cows, goat somatic cell count (SCC) is higher and probably more affected by physiological factors such as parity, stage of lactation, and season. Thus, SCC is believed to be a less precise indicator of intramammary infections in dairy goats, and no consensus exists on SCC thresholds for considering goats as infected. The Norwegian Goat Recording System maintains individual goat production records and results from microbiological analyses of milk samples. In this retrospective observational study, we used recordings over a 10-yr period (2010 to 2020) to describe the association between individual goat SCC and noninfectious factors, as well as intramammary infections. The median SCC in the 1,000,802 milk recordings included in the study was 440,000 cells/mL, and the mode was 70,000 cells/mL. Somatic cell count increased with parity, days in milk, estrus, pasture season, and intramammary infections. The effect of parity and stage of lactation was significantly higher in infected compared with uninfected goats. Staphylococci dominated as causes of intramammary infections, with Staphylococcus aureus as the udder pathogen associated with highest SCC. The most prevalent non-aureus staphylococci were Staphylococcus warneri, Staphylococcus epidermidis, and Staphylococcus caprae. This study provides guidelines for interpretation of goat SCC at different parities and stages of lactations under Norwegian management conditions. We revealed a considerable variation in SCC associated with physiological factors, indicating that the cutoff for identifying infected goats should be a dynamic threshold adjusted for parity, stage of lactation, and season.

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Section: Smistad Et Al: Scc and Udder Pathogens In Norwegian Dairy Goatsmentioning

confidence: 99%

Distribution of somatic cell count and udder pathogens in Norwegian dairy goats

Smistad

Sølverød

Inglingstad

et al. 2021

Journal of Dairy Science

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“…(2012) and Gosselin et al . (2020) found Staphylococcus caprae as the second more frequent pathogen when we detected S. caprae as the most common pathogen. Staphylococcus aureus is considered the most important contagious pathogen in dairy goats, ranging from 4% to 40% of bacteriologically positive samples (Min et al ., 2007; Marogna et al ., 2010; Persson and Olofsson, 2011; Dore et al ., 2016).…”

Section: Discussionmentioning

confidence: 48%

“…Our data confirm the presence of high SCC in goat milk samples, comparable to those of Moroni et al (2005), Gosselin et al . (2020) and Podhorecká et al . (2021) but almost twice that reported by Persson and Olofsson, (2011).…”

Section: Discussionmentioning

confidence: 96%

“…Our findings confirm this result and seem to be different from a previous study done in dairy ewes in which we did not find effect of different pathogens on SCS over the range 6.68 ± 0.41 to 8.11 ± 0.63 (Tvarožková et al ., 2020). Various observations have reported the effect of different pathogens on SCC in milk of goats (Moroni et al ., 2005; Koop et al ., 2012; Gosselin et al ., 2020). Staphylococcus caprae was associated with higher SCC compared to other CNS (Moroni et al ., 2005).…”

Section: Discussionmentioning

confidence: 99%

“…The low number of S. aureus infections meant that we could neither confirm nor refute this observation. In another study S. caprae, S. epidermidis, S. simulans and S. xylosus were associated with higher SCC than other CNS species (Gosselin et al ., 2020). We have considered the possibility that our high SCC values might indicate infection by microorganisms other than those we could detect using the methods employed ( Mycoplasma , for example).…”

Section: Discussionmentioning

confidence: 99%

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Pathogens in milk of goats and their relationship with somatic cell count

Tvarožková,

Tančin,

Uhrinčať

et al. 2023

Journal of Dairy Research

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We evaluated the presence of bacterial pathogens in the milk of goats and their relationship with somatic cell count (SCC) and milk composition. The study was performed on a dairy farm in northern Slovakia. Half udder milk samples were collected from goats in June and July. The samples were divided on the basis of SCC into 4 bands (SCC1 lowest to SCC4 highest). Bacterial pathogens were only detected in 13% of samples. SCC3 and SCC4 had 15 and 25% positive samples respectively compared with SCC1 (2%) and SCC2 (14%). Coagulase-negative staphylococci (CNS) were the most common isolates (73%), of which Staphylococcus caprae was the most frequently isolated (65%). In samples with ≥ 1000 × 103 cells ml− 1 (SCC3, SCC4) there was higher somatic cell score (SCS) in the presence of a pathogen (7.48 ± 0.11) than without a pathogen (7.16 ± 0.05, P < 0.01). Statistically significant but weak negative correlations were observed between SCS and lactose, dry matter and non-fat dry matter. In conclusion, a higher percentage of bacteriologically positive milk samples was observed in both SCC3 and SCC4 groups but this does not explain the aetiology of high SCC in the milk of goats that are apparently free of bacteria. As a diagnostic tool, SCC is probably less useful in goats than in cows.

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Udder Health for Dairy Goats

Menzies

2021

Veterinary Clinics of North America: Food Animal Practice

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Association between species-specific staphylococcal intramammary infections and milk somatic cell score over time in dairy goats

Cited by 5 publications

References 21 publications

Distribution of somatic cell count and udder pathogens in Norwegian dairy goats

Distribution of somatic cell count and udder pathogens in Norwegian dairy goats

Pathogens in milk of goats and their relationship with somatic cell count

Udder Health for Dairy Goats

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