Indicators of mastitis and milk quality in dairy cows : data, modeling, and prediction in automatic milking systems

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Anglart, DorotaSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för kliniska vetenskaper (KV),Department of Clinical Sciences (author)

Indicators of mastitis and milk quality in dairy cows : data, modeling, and prediction in automatic milking systems

BookEnglish2021

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2021
Department of Clinical Sciences, Swedish University of Agricultural Sciences,2024

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LIBRIS-ID:oai:slubar.slu.se:109777
ISBN:9789177606888
ISBN:9789177606895
https://res.slu.se/id/publ/109777URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:vet swepub-contenttype
Subject category:dok swepub-publicationtype

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Acta Universitatis Agriculturae Sueciae,1652-6880

Notes

Methods for generating predictions of important and generally accepted indicators of udder inflammation and poor milk quality, such as somatic cell count (SCC) or changes in milk homogeneity, are few. The aim of this thesis was to investigate methods to identify indicators of mastitis and poor milk quality in dairy cows using data generated by automatic milking systems (AMS).The first part of the project investigated the relationship between SCC and data regularly recorded by the AMS using models that could capture nonlinear associations between the explanatory variables and the outcome. This information could be used in modeling the SCC. Furthermore, three statistical methods, generalized additive model, random forest and multilayer perceptron, were compared for their ability to predict SCC using data generated by the AMS. The results showed that equally low prediction error was obtained using generalized additive model or multilayer perceptron for prediction of SCC based on AMS data.The second part explored the dynamics of changes in milk homogeneity in cows milked in AMS using descriptive statistics for clots collected by inline filters, scored for density. Clots were found among certain cows and cow periods and appeared in new quarters over time. Models were fitted for detecting and predicting clots in single cow milkings as well as for detecting clots in milkings over a longer period. The models successfully distinguished periods of milking free of changes in milk homogeneity, although the detection and prediction performance was poor. The prediction target and severity grade of each density category is discussed.

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Sveriges lantbruksuniversitetInstitutionen för kliniska vetenskaper (KV) (creator_code:org_t)
Sveriges lantbruksuniversitet

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By the author/editor: Anglart, Dorota

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AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Veterinary Scien ...; and Clinical Science

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Animal and Dairy ...; and Animal and Dairy ...

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By the university: Swedish University of Agricultural Sciences

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