On distinguishing cause and consequence: Do high somatic cell counts lead to lower milk yield or does high milk yield lead to lower somatic cell count?

Green, Laura; Schukken, Y.H.; Green, Michael J.

doi:10.1016/j.prevetmed.2006.04.012

Cited by 82 publications

(93 citation statements)

References 15 publications

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“…Mastitis caused by CNS is typically a mild, subclinical reaction (Schukken et al, 2009) that is most commonly associated with increased milk SCC. Coagulase-negative staphylococci IMI have been associated both with decreased milk production (Green et al, 2006) and with slight but significant increased production Schukken et al, 2009;Piepers et al, 2010). Similarly, infection with Corynebacterium spp.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of minor pathogen intramammary infection, susceptibility parameters, and somatic cell counts on the development of new intramammary infections with major mastitis pathogens

Reyher

Dohoo

Scholl

et al. 2012

Journal of Dairy Science

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Section: Introductionmentioning

confidence: 99%

Evaluation of minor pathogen intramammary infection, susceptibility parameters, and somatic cell counts on the development of new intramammary infections with major mastitis pathogens

Reyher

Dohoo

Scholl

et al. 2012

Journal of Dairy Science

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“…A dilution factor of −0.485, according to Green et al (2006), was applied for SCC only for those cows that had more than 10 kg of daily milk yield and an SCC of < 50 000. Only a few studies proposed the existence of the dilution effect from increased milk yield on the SCC (at the level of 200 000) in cows without IMI.…”

Section: Resultsmentioning

confidence: 99%

“…The estimated SCCs of high-yielding dairy cows without IMI were found to be lower than those of low-yielding dairy cows (Green et al, 2006;Halasa et al, 2009;Boland et al, 2013). If the SCC concentration due to lower milk production in infected cows is neglected, the milk production loss might be overestimated.…”

Section: Introductionmentioning

confidence: 94%

“…When the SCCI was calculated, we considered the effect of dilution for high-milk-yielding cows without IMI. For cows with a daily milk yield above 10 kg and an SCC lower than 50 000, we performed a correction by using the factor −0.485 (Green et al, 2006). For calculation of the SCCI we used the following equation:…”

Section: Somatic Cell Count Indexmentioning

confidence: 99%

“…If the SCC concentration due to lower milk production in infected cows is neglected, the milk production loss might be overestimated. Overestimation of milk production loss can be avoided by using a dilution factor λ for the adjustment of the yield and category of SCC (Green et al, 2006). Nevertheless, few previous studies could not completely clarify the relation between dilution effect and estimated milk loss.…”

Section: Introductionmentioning

confidence: 99%

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A new somatic cell count index to more accurately predict milk yield losses

2017

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Abstract. Intramammary infection and clinical mastitis in dairy cows leads to considerable economic losses for farmers. The somatic cell concentration in cow's milk has been shown to be an excellent indicator for the prevalence of subclinical mastitis. In this study, a new somatic cell count index (SCCI) was proposed for the accurate prediction of milk yield losses caused by elevated somatic cell count (SCC). In all, 97 238 lactations (55 207 Holstein cows) from 2328 herds were recorded between 2010 and 2014 under different scenarios (high and low levels of SCC, four lactation stages, different milk yield intensities, and parities (1, 2, and ≥ 3). The standard shape of the curve for SCC was determined using completed standard lactations of healthy cows. The SCCI was defined as the sum of the differences between the measured interpolated values of the natural logarithm of SCC (ln(SCC)) and the values for the standard shape of the curve for SCC for a particular period, divided by the total area enclosed by the standard curve and upper limit of ln(SCC) = 10 for SCC. The phenotypic potential of milk yield (305-day milk yield -MY305) was calculated using regression coefficients estimated from the linear regression model for parity and breeding values of cows for milk yield. The extent of daily milk yield loss caused by increased SCC was found to be mainly related to the early stage of lactation. Depending on the possible scenarios, the estimated milk yield loss from MY305 for primiparous cows was at least 0.8 to 0.9 kg day −1 and for multiparous cows it ranged from 1.3 to 4.3 kg day −1 . Thus, the SCCI was a suitable indicator for estimating daily milk yield losses associated with increased SCC and might provide farmers reliable information to take appropriate measures for ensuring good health of cows and reducing milk yield losses at the herd level.

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Risk factors of high somatic cell count and differential somatic cells in early lactation associated with selective dry cow therapy

Mondini,

Gislon,

Zucali

et al. 2023

animal

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On distinguishing cause and consequence: Do high somatic cell counts lead to lower milk yield or does high milk yield lead to lower somatic cell count?

Cited by 82 publications

References 15 publications

Evaluation of minor pathogen intramammary infection, susceptibility parameters, and somatic cell counts on the development of new intramammary infections with major mastitis pathogens

Evaluation of minor pathogen intramammary infection, susceptibility parameters, and somatic cell counts on the development of new intramammary infections with major mastitis pathogens

A new somatic cell count index to more accurately predict milk yield losses

Risk factors of high somatic cell count and differential somatic cells in early lactation associated with selective dry cow therapy

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