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Effect of grazing fresh legumes or feeding silage on enzymes involved in the synthesis of milk fat in dairy cows

Wiking, L.; Theil, Peter K.; Nielsen, Jacob H. and Sørensen, Martin T. (2009) Effect of grazing fresh legumes or feeding silage on enzymes involved in the synthesis of milk fat in dairy cows. Journal of Dairy Research, 77, pp. 337-342.

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Summary

The impact of fresh legume types or silage on the composition of milk fatty acids and transcription of enzymes involved in the synthesis of milk fat in cows was studied. Three groups of cows grazed white clover, red clover and lucerne, respectively. A fourth group of cows was fed maize/grass silage. The cows grazing high proportions of legumes produced significantly more C18:1 trans-11, C18:2 cis9-trans11, C18:2 trans10-cis12 and C18:3 fatty acids than cows fed silage. White clover and lucerne grazing resulted in significantly less output of C18:1 trans9 in milk than red clover grazing and maize/grass silages. The transcription of Stearoyl-CoA desaturase (SCD) in mammary tissue was significantly increased by grassing high proportions legume whereas fatty acid synthase and Acetyl-Coa carboxylase was not affected by type of feeding. Furthermore, average milk fat globule diameter was correlated to daily milk fat yield but was not affected by feeding. Although the fresh forage affected the transcription of SCD in mammary tissue, the largest effects were on the trans11-based fatty acids, concluding that type of forage, i.e. fresh or silage, had larger impact on rumen fermentation pattern than on transcription of enzymes involved in the synthesis of milk fat.


EPrint Type:Journal paper
Subjects: Food systems > Food security, food quality and human health
Animal husbandry > Feeding and growth
Research affiliation: Denmark > AU - Aarhus University > AU, DJF - Faculty of Agricultural Sciences
Denmark > DARCOF III (2005-2010) > ORMILKQUAL - High quality organic milk
DOI:10.1017/S002202991000021X
Deposited By: Larsen, Scientist Mette Krogh
ID Code:16596
Deposited On:29 Dec 2009 09:59
Last Modified:30 Apr 2013 10:38
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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