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Dry period length of dairy cows

milk composition and quality

De Vries, Ruben (2017). Dry period length of dairy cows. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2017:10
ISBN 978-91-576-8793-7
eISBN 978-91-576-8794-4
[Doctoral thesis]

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A dry period of dairy cows is historically seen as a period during which the cow can restore its body condition and regenerate its mammary epithelium in order to be high yielding in the successive lactation. Recent work has indicated that high yielding cows generally experience a severe negative energy balance in early lactation. Dry period reduction is a strategy to improve the energy balance of dairy cows in early lactation. This thesis aimed at evaluating the influence of dry period length on milk composition and milk quality. Milk composition parameters indicate the processing quality of milk for the dairy plant, and may also reflect the physiological condition and energy status of the cow.
In this work, omission of the dry period was related to a reduced β-casein fraction in early lactation milk. Applying a short (4 weeks) instead of a conventional (8 weeks) dry period resulted in increased plasmin activity in milk, but did not affect the β-casein fraction. Increased plasmin activity in relation to a shortened dry period was particularly found in milk of cows of third or higher parity, that generally had relatively high somatic cell count. At low somatic cell counts, dry period reduction or omission only tended to result in an increased plasmin activity due a higher casein concentration in milk. From increased concentrations of a number of low abundant proteins in colostrum of cows with a short dry period it was hypothesized that a short dry period was related to increased proliferation of mammary epithelial cells during the first days in lactation.
Although the casein composition of milk was related to both plasmin activity in milk and the metabolic status of cows, which are both influenced by dry period length, quantitative differences in casein composition of cows with different dry period length were small. It was concluded that shortening or omitting the dry period of cows with good mammary health obtains milk with a higher protein content with little differences in protein composition.

Authors/Creators:De Vries, Ruben
Title:Dry period length of dairy cows
Subtitle:milk composition and quality
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :10 February 2017
Depositing date:3 February 2017
Number of Pages:54
1de Vries, R., van Knegsel, A.,. Johansson, M., Lindmark-Månsson, H., van Hooijdonk, T., Holtenius, K. and Hettinga K. (2015). Influence of shortening or omitting the dry period of Holstein-Friesian cows on casein composition of milk. J. Dairy Sci. 98(12):8678-8687.
2de Vries, R., Brandt, M. Lundh, Å., Holtenius, K., Hettinga, K. and Johansson M. (2016). Short communication: Influence of shortening the dry period of Swedish dairy cows on plasmin activity in milk. J. Dairy Sci. 99 (11):9300-9306.
3de Vries, R., van Hooijdonk, T. and Hettinga, K. Influence of dry period length of dairy cows on casein micelle composition in early and mid-lactation milk (Manuscript).
4de Vries, R., Boeren, S., Holtenius, K., Vervoort, J., Lindmark-Månsson, H. and Hettinga, K. Influence of dry period length of Swedish dairy cows on the proteome of colostrum (Manuscript).
5de Vries, R., van Knegsel, A., Hettinga, K. and Antunes-Fernandes, E. Blood glucose concentration relates to milk composition of dairy cows in early lactation (Manuscript).
Place of Publication:Uppsala
Publisher:Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8793-7
ISBN for electronic version:978-91-576-8794-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L01 Animal husbandry
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Agrovoc terms:dairy cows, milk production, quality, lactation duration, protein content, plasmin, mammary glands
Keywords:dry period length, dairy cows, milk protein composition, milk processing quality, casein composition, plasmin activity, milk proteomics, mammary epithelial cells
Permanent URL:
ID Code:14021
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
Deposited By: Ruben de Vries
Deposited On:07 Feb 2017 09:44
Metadata Last Modified:10 Sep 2020 13:41

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