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Bovine udder quarter milk in relation to somatic cell count

focus on milk composition and processing properties

Forsbäck, Linda (2010). Bovine udder quarter milk in relation to somatic cell count. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2010:53
ISBN 978-91-576-7466-1
[Doctoral thesis]

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Abstract

The dairy industry requires raw milk of high quality in order to produce milk products of high quality and quantity. Mastitis is one of the most prevalent and economically important production diseases in dairy cattle. It causes increased somatic cell count (SCC), deteriorated milk composition and consequently altered processing properties of milk. Altered milk composition due to mastitis often occurs in only one of the four udder quarters of the cow. Milk with high SCC and deteriorated milk composition can be excluded at cow level. A future option will be to detect and exclude milk at udder quarter level, which can be achieved in automatic milking (AM) systems. This thesis examined alterations in milk composition in individual udder quarters in relation to elevated SCC. The studies were mainly carried out on Swedish Red Breed cows with low to moderate SCC, all supplying milk to a commercial dairy. It was found that around 30% of the cows with low cow composite SCC (below 100 000 cells/ml) had one or more udder quarters with elevated SCC and altered milk composition. Furthermore, individual udder quarters with deteriorated milk composition and signs of reduced blood-milk barrier were found in cows with low to moderate levels of composite SCC. In addition, cows with elevated SCC had one or more udder quarters with low SCC and unaffected milk composition. It was also observed that the relative day-to-day variation in milk components in the four udder quarters of a healthy cow is similar, which suggests that using repeated measurements of milk composition at udder quarter level could be a suitable tool for detecting alterations in milk composition and health. Milk composition was affected by duration of storage and content of bacteria, as well as SCC. Separating the milk from individual udder quarters was shown to affect the content of total protein, whey protein and lactose at cow level. The main conclusions from this thesis are that individual udder quarters with deteriorated milk composition can be found in cows with fairly low SCC, and that exclusion of the milk from these udder quarters can improve overall milk quality. These results are important when discussing whether exclusion of some milk at udder quarter level should be introduced to improve milk quality.

Authors/Creators:Forsbäck, Linda
Title:Bovine udder quarter milk in relation to somatic cell count
Subtitle:focus on milk composition and processing properties
Year of publishing :2010
Volume:2010:53
Number of Pages:70
Papers/manuscripts:
NumberReferences
ALLI. Forsbäck, L., Lindmark-Månsson, H., Andrén, A, Åkerstedt, M. & Svennersten-Sjaunja, K. (2009) Udder quarter milk composition at different levels of somatic cell count in cow composite milk. Animal 3(5), 710-717. http://journals.cambridge.org/action/displayAbstract?aid=5225772 II. Forsbäck, L., Lindmark-Månsson, H., Andrén, A, & Svennersten-Sjaunja, K. (2010) Evaluation of quality changes in udder quarter milk from cows with low-to-moderate somatic cell counts. Animal 4(4), 617-626. http://journals.cambridge.org/action/displayAbstract?aid=7284624 III. Forsbäck, L., Lindmark-Månsson, H., Andrén, A, Åkerstedt, M. Andrée L. & Svennersten-Sjaunja, K. (2010) Day-to-day variation in milk yield and milk composition at udder quarter level. Journal of Dairy Science 93(8), 3569-3577. IV. Forsbäck, L., Lindmark-Månsson, H., Svennersten-Sjaunja, K., Bach Larsen, L. & Andrén, A. Effect of storage and separation of milk at udder quarter level on milk composition, proteolysis and coagulation properties in relation to somatic cell count (Manuscript).
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7466-1
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:dairy cows, milk, proximate composition, cell counting, proteolysis, animal health
Keywords:dairy cow, milk composition, udder quarter, somatic cell count, processing properties, proteolysis, storage time
URN:NBN:urn:nbn:se:slu:epsilon-3084
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-3084
ID Code:2332
Department:(VH) > Dept. of Animal Nutrition and Management
Deposited By: Linda Forsbäck
Deposited On:24 Aug 2010 00:00
Metadata Last Modified:02 Dec 2014 10:17

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