Short communication: Influence of shortening the dry period of Swedish dairy cows on plasmin activity in milk

Ruben de Vries, Melanie Brandt, Åse Lundh, Kjell Holtenius, Kasper Hettinga, Monika Johansson

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

The aim of this study was to evaluate the influence of shortening the dry period of Swedish dairy cows on plasmin activity and casein composition in milk. Swedish Holstein and Swedish Red cows, 45 in total, were assigned to a dry period of either 4 or 8 wk. Milk samples were taken 10 and 5 wk prepartum, and 6 and 12 wk postpartum. Plasmin activity and plasminogen activity were measured with a spectrophotometric assay. Casein composition was measured by capillary zone electrophoresis. Prepartum plasminogen activity increased by 22% between 10 and 5 wk prepartum, whereas no change in plasmin activity was observed during the same period. Cows with a 4-wk dry period had 61% higher plasmin activity in postpartum milk than cows with an 8-wk dry period. Cows of third or greater parity tended to have a stronger increase in plasmin activity as a result of applying a short dry period than cows of second parity. Although the αS1- and β-casein fractions declined with increasing plasmin activity, no dry period effects were found. Based on postpartum differences in plasmin activity, it was concluded that particularly multiparous cows require more than 4 wk between lactations for recovery of the mammary epithelium. Changes in casein composition as an effect of plasmin activity are not expected to have a great effect on processing quality of milk, although future work is needed to verify this.

LanguageEnglish
Pages9300-9306
JournalJournal of Dairy Science
Volume99
Issue number11
DOIs
Publication statusPublished - 2016

Fingerprint

dry period (lactation)
plasmin
Fibrinolysin
shortenings
animal communication
Milk
dairy cows
milk
Caseins
cows
Postpartum Period
plasminogen
casein
Plasminogen
Parity
capillary zone electrophoresis
milk quality
beta-casein
Capillary Electrophoresis
milk composition

Keywords

  • Casein composition
  • Dairy cow
  • Dry period
  • Milk quality
  • Plasmin activity

Cite this

de Vries, Ruben ; Brandt, Melanie ; Lundh, Åse ; Holtenius, Kjell ; Hettinga, Kasper ; Johansson, Monika. / Short communication : Influence of shortening the dry period of Swedish dairy cows on plasmin activity in milk. In: Journal of Dairy Science. 2016 ; Vol. 99, No. 11. pp. 9300-9306.
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abstract = "The aim of this study was to evaluate the influence of shortening the dry period of Swedish dairy cows on plasmin activity and casein composition in milk. Swedish Holstein and Swedish Red cows, 45 in total, were assigned to a dry period of either 4 or 8 wk. Milk samples were taken 10 and 5 wk prepartum, and 6 and 12 wk postpartum. Plasmin activity and plasminogen activity were measured with a spectrophotometric assay. Casein composition was measured by capillary zone electrophoresis. Prepartum plasminogen activity increased by 22{\%} between 10 and 5 wk prepartum, whereas no change in plasmin activity was observed during the same period. Cows with a 4-wk dry period had 61{\%} higher plasmin activity in postpartum milk than cows with an 8-wk dry period. Cows of third or greater parity tended to have a stronger increase in plasmin activity as a result of applying a short dry period than cows of second parity. Although the αS1- and β-casein fractions declined with increasing plasmin activity, no dry period effects were found. Based on postpartum differences in plasmin activity, it was concluded that particularly multiparous cows require more than 4 wk between lactations for recovery of the mammary epithelium. Changes in casein composition as an effect of plasmin activity are not expected to have a great effect on processing quality of milk, although future work is needed to verify this.",
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Short communication : Influence of shortening the dry period of Swedish dairy cows on plasmin activity in milk. / de Vries, Ruben; Brandt, Melanie; Lundh, Åse; Holtenius, Kjell; Hettinga, Kasper; Johansson, Monika.

In: Journal of Dairy Science, Vol. 99, No. 11, 2016, p. 9300-9306.

Research output: Contribution to journalArticleAcademicpeer-review

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