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New markers of bulk milk quality in relation to mastitis

studies on polymorphonuclear leukocytes and α-lactalbumin

Wickström, Erik (2009). New markers of bulk milk quality in relation to mastitis. Uppsala : Sveriges lantbruksuniv. , Rapport / Sveriges lantbruksuniversitet, Institutionen för livsmedelsvetenskap, 1101-5411 ; 25
ISBN 978-91-86197-49-0
[Licentiate thesis]

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Abstract

All dairy processors depend on a continuous supply of high-quality bulk milk from milk producers to be able to distribute liquid milk and dairy products. Mastitis, inflammation of the bovine udder, is the most common disease in dairy cows, and leads to altered milk composition and impaired milk quality. The somatic cell count (SCC) is currently used as a marker for udder health, and indirectly, for bulk milk quality, but because it is somewhat insensitive and unspecific, there has been an interest to find alternative markers. The main objective of this thesis was to acquire more knowledge about two potential markers for bulk milk quality: polymorphonuclear leukocyte count (PMNC) and α-lactalbumin (α-LA). Another objective was to study if the combination of α-LA, haptoglobin (Hp) and serum amyloid A (SAA) in an acute phase index (API) could be useful as an alternative marker for bulk milk quality. Bulk milk samples were collected from Swedish dairy farms and analyzed for PMNC, α-LA, SCC, haptoglobin (Hp), serum amyloid A (SAA), fat, lactose, total protein and casein contents, casein number, protein composition, proteolysis and coagulating properties. An API was calculated for each sample by combining results on α-LA, Hp and SAA. Samples with high PMNC had a lower casein number than samples with low PMNC, while samples with high SCC had lower lactose and casein contents, lower casein number and more proteolysis than low SCC samples. There was no significant difference in the inflammatory markers SCC, PMNC, Hp and SAA between milk samples containing low, medium or high concentrations of α-LA. Differences between α-LA groups were, however, found in some milk quality parameters as high α-LA concentration was related to low concentrations of αs1-, αs2- and β-casein, and high concentrations of lactose and β-lactoglobulin. High API was related to low lactose content and casein number. In conclusion, PMNC and α-LA were not considered more useful markers of inflammation and milk quality in bulk milk than SCC, which is currently used.

Authors/Creators:Wickström, Erik
Title:New markers of bulk milk quality in relation to mastitis
Subtitle:studies on polymorphonuclear leukocytes and α-lactalbumin
Year of publishing :2009
Volume:25
Number of Pages:33
Papers/manuscripts:
NumberReferences
ALLI) Wickström, E., Persson Waller, K., Östensson, K., Lindmark-Månsson, H. and Sternesjö, Å. (2009) Relationships between somatic cell count, polymorphonuclear leukocyte count and milk quality parameters in bulk tank milk. Journal of Dairy Research, 76(2), 195-201. II) Wickström, E., Persson Waller, K., Lindmark-Månsson, H. and Sternesjö, Å. (2009) Relationships between α-lactalbumin and milk quality parameters in bulk milk (manuscript).
Place of Publication:Uppsala
ISBN for printed version:978-91-86197-49-0
ISSN:1101-5411
Language:English
Publication Type:Licentiate thesis
Full Text Status:Public
Agrovoc terms:cow milk, proximate composition, quality, dairy cows, bovine mastitis, leukocytes, albumins, somatic cell count, casein
Keywords:bulk milk quality, polymorphonuclear leukocyte, alpha-lactalbumin, acute phase protein, haptoglobin, serum amyloid A, somatic cell count, mastitis, protein composition, casein content
URN:NBN:urn:nbn:se:slu:epsilon-2985
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-2985
ID Code:2111
Department:(NL, NJ) > Dept. of Food Science (until 161231)
Deposited By: Erik Wickström
Deposited On:30 Sep 2009 00:00
Metadata Last Modified:02 Dec 2014 10:16

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