UZH-Logo

Maintenance Infos

Extent of modification of the fatty acid profile of milk at the start of lactation by the feeding of fat in the dry period = Variation des Fettsäuremusters der Milch in der Startphase bei Fütterung von Fett in der Trockenstehzeit


Hochstrasser, Ruth. Extent of modification of the fatty acid profile of milk at the start of lactation by the feeding of fat in the dry period = Variation des Fettsäuremusters der Milch in der Startphase bei Fütterung von Fett in der Trockenstehzeit. 2011, University of Zurich, Vetsuisse Faculty.

Abstract

The aim of this study was to investigate metabolism of unsaturated fatty acids in ruminants. We focused particularly on the question if there is a selective mobilisation of n-3 fatty acids from adipose tissue during start of lactation, when demands are augmented. 10 Brown Swiss and 14 Holstein Friesian dairy cows form the herd of the ETH Zurich research station were allotted into 4 groups which got an isoenergetic ration with a concentrate containing different amounts of either n-3 fatty acids as linseed or n-6 fatty acids as sunflower seed. The sampling took place from 6 weeks before to 6 weeks after calving. During this time, feed, blood, adipose tissue and milk samples were taken regularly. 2 weeks before calving, intense metabolic measurements were made. This study shows the influence of the dry period feeding on fatty acid pattern of milk. But the effect lasts only for a few days. Hence there seems to be no use feeding n-3 rich concentrates before calving to enrich milk for human consumption. Fatty acid pattern of milk is mainly influenced by the actual diet. The different contents of unsaturated fatty acids in adipose tissue gives evidence for a selective mobilisation of n-3 fatty acids.

The aim of this study was to investigate metabolism of unsaturated fatty acids in ruminants. We focused particularly on the question if there is a selective mobilisation of n-3 fatty acids from adipose tissue during start of lactation, when demands are augmented. 10 Brown Swiss and 14 Holstein Friesian dairy cows form the herd of the ETH Zurich research station were allotted into 4 groups which got an isoenergetic ration with a concentrate containing different amounts of either n-3 fatty acids as linseed or n-6 fatty acids as sunflower seed. The sampling took place from 6 weeks before to 6 weeks after calving. During this time, feed, blood, adipose tissue and milk samples were taken regularly. 2 weeks before calving, intense metabolic measurements were made. This study shows the influence of the dry period feeding on fatty acid pattern of milk. But the effect lasts only for a few days. Hence there seems to be no use feeding n-3 rich concentrates before calving to enrich milk for human consumption. Fatty acid pattern of milk is mainly influenced by the actual diet. The different contents of unsaturated fatty acids in adipose tissue gives evidence for a selective mobilisation of n-3 fatty acids.

Downloads

18 downloads since deposited on 15 Mar 2012
7 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Dissertation
Referees:Wanner M, Kreuzer M
Communities & Collections:05 Vetsuisse Faculty > Institute of Animal Nutrition
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Language:English
Date:2011
Deposited On:15 Mar 2012 21:06
Last Modified:05 Apr 2016 15:40
Number of Pages:79
Related URLs:http://opac.nebis.ch/F/?local_base=NEBIS&CON_LNG=GER&func=find-b&find_code=SYS&request=007074790
Permanent URL: http://doi.org/10.5167/uzh-60074

Download

[img]
Preview
Filetype: PDF (Titelblatt und Inhaltsverzeichnis)
Size: 79kB

TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.

Author Collaborations