Impact of herbage proportion, animal breed, lactation stage and season on the fatty acid and protein composition of milk. (October 2020)

• Record Type: Journal Article
• Authors: Bär, Cornelia; Sutter, Michael; Kopp, Christoph; Neuhaus, Patrick; Portmann, Reto; Egger, Lotti; Reidy, Beat; Bisig, Walter
• Is Part Of: International dairy journal. Volume 109(2020)
• Publication Date: 2020-10
• Subjects: Dairying -- Periodicals; Industrie laitière -- Périodiques; Electronic journals; 338.1762142
• DOI: 10.1016/j.idairyj.2020.104785
• Languages: English
• ISSNs: 0958-6946

Abstract

Abstract: Impact of herbage proportion, breed, average days in lactation (ADiL), and season on bulk milk composition of 12 dairy farms were investigated over a year using a mixed effect model approach. A 10%-points higher proportion of herbage led to higher contents of omega 3 (n-3) fatty acids (FAs), conjugated linoleic acids (CLA), vaccenic acid, and branched chain FAs (+0.08, +0.08, +0.19, +0.05 g 100 g −1 fat, respectively). Breed influenced n-3 FAs and CLA (+0.31, +0.17 g 100 g −1 fat, respectively), κ-casein, lipoprotein lipase, β-lactoglobulin, total whey protein, fatty acid synthase, and glycoprotein-2, resulting in +0.96, −0.019, −0.83, −1.12, +0.009, and +0.01 g 100 g −1 measured proteins, respectively, in Brown Swiss milk. ADiL influenced lactoferrin and crude protein; season affected all FAs and proteins examined. The identification of these quantitative relationships allow predictions that provide new insights for the production, processing and commercialisation of grassland-based dairy products.