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Effects of full-time v. part-time grazing on seasonal changes in milk coagulation properties and fatty acid composition

Published online by Cambridge University Press:  17 March 2021

Franziska S. Akert ,
Michael Kreuzer ,
Carmen Kunz ,
Beat Reidy  and
Joel Berard
Franziska S. Akert
Affiliation:
ETH Zurich, Institute of Agricultural Sciences, Universitaetstrasse 2, 8092Zurich, Switzerland HAFL Zollikofen, University of Applied Sciences Bern BFH, Länggasse 85, 3052Zollikofen, Switzerland
Michael Kreuzer
Affiliation:
ETH Zurich, Institute of Agricultural Sciences, Universitaetstrasse 2, 8092Zurich, Switzerland
Carmen Kunz
Affiliation:
ETH Zurich, Institute of Agricultural Sciences, Universitaetstrasse 2, 8092Zurich, Switzerland
Beat Reidy
Affiliation:
HAFL Zollikofen, University of Applied Sciences Bern BFH, Länggasse 85, 3052Zollikofen, Switzerland
Joel Berard*
Affiliation:
Agroscope, Animal Production Systems, Rte de la Tioleyre 4, 1725Posieux, Switzerland
*
Author for correspondence: Joel Berard, Email: joel.berard@agroscope.admin.ch
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Abstract

For this research communication our objective was to investigate to what extent milk coagulation properties and milk fatty acid (FA) composition were affected by different feeding systems, season and their interaction. Eighteen cows in total were subjected to one of three different feeding system treatments: full-time grazing or part-time grazing combined with indoor feeding of fresh grass with low or high concentrate supplementation. Milk was sampled in spring, summer and autumn. Milk coagulation time was 15.0, 19.0 and 17.7 min, coagulation dynamics 1.67, 3.41 and 1.79 min, and curd firmness 52.7, 32.4 and 47.0 mm in spring, summer and autumn, respectively. Thus, milk coagulation properties of the milk were lower during summer. There were strong seasonal effects on milk FA proportions, but there were not always changes with progressing season, or changes were different with respect to the impact of the feeding systems (system × season interaction). The milk fat was favourably rich in oleic acid, conjugated linoleic acid and α-linolenic acid and had a low n-6/n-3 fatty acid ratio in all systems. Factors like seasonal variations in grass composition and the energy balance of the cows were considered relevant for the milk FA composition. Overall, seasonal variations in milk quality were less pronounced with part-time grazing with fresh grass indoors as compared to full-time grazing without concentrate.

Keywords

Concentrate supplementationdairyfatty acid compositiongrazingmilk coagulation properties
Type
Research Article
Information
Journal of Dairy Research , Volume 88 , Issue 1 , February 2021 , pp. 23 - 28
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation

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