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Linear Mixed-effects model to quantify the association between somatic cell count and milk production in Italian dairy herds

View ORCID ProfileTiantian Luo, Wilma Steeneveld, Mirjam Nielen, Lucio Zanini, View ORCID ProfileAlfonso Zecconi
doi: https://doi.org/10.1101/2022.07.15.500192
Tiantian Luo
1Faculty of Veterinary Medicine, Department of Population Health Sciences, Section of Farm Animal Health, Utrecht University, Utrecht, The Netherlands
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  • For correspondence: luott0308@gmail.com
Wilma Steeneveld
1Faculty of Veterinary Medicine, Department of Population Health Sciences, Section of Farm Animal Health, Utrecht University, Utrecht, The Netherlands
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Mirjam Nielen
1Faculty of Veterinary Medicine, Department of Population Health Sciences, Section of Farm Animal Health, Utrecht University, Utrecht, The Netherlands
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Lucio Zanini
2Associazione Regionale Allevatori Lombardia, Crema, Italy
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Alfonso Zecconi
3Department of Biomedical, Surgical and Dental Sciences – One Health Unit. Università degli Studi di Milano. Milan, Italy
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Abstract

Milk production loss due to mastitis in dairy herds is economically important. Before estimating the economic impacts of mastitis, it is crucial to quantify the association between mastitis and milk production. The objective of this study was to estimate the association between somatic cell count (SCC, as an indicator of intramammary infection due to mastitis) and milk production for dairy cows in Lombardy (Italy). The test-day (TD) records data of 3,816 dairy herds located in 3 different geographical areas of Lombardy from January 2016 to December 2018 were used. After data editing, the final dataset comprised 10,445,464 TD records from 2,970 farms and 826,831 cows. The analysis was carried out by using a mixed-effects model with seven fixed effects (geographical area, breed, days in milk, parity, season and year) and nested random effects for each cow and herd. The results indicated that the SCC had a negative association with milk production. When the SCC increased every two-fold, the milk production lost 0.830 (95% CI: −0.832, −0.828) kg/cow/day in the whole Lombardy. These results can be used for economic calculations on the costs of mastitis

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted July 17, 2022.
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Linear Mixed-effects model to quantify the association between somatic cell count and milk production in Italian dairy herds
Tiantian Luo, Wilma Steeneveld, Mirjam Nielen, Lucio Zanini, Alfonso Zecconi
bioRxiv 2022.07.15.500192; doi: https://doi.org/10.1101/2022.07.15.500192
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Linear Mixed-effects model to quantify the association between somatic cell count and milk production in Italian dairy herds
Tiantian Luo, Wilma Steeneveld, Mirjam Nielen, Lucio Zanini, Alfonso Zecconi
bioRxiv 2022.07.15.500192; doi: https://doi.org/10.1101/2022.07.15.500192

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