title: Impact of US Brown Swiss genetics on milk quality from low-input herds in Switzerland: interactions with grazing intake and pasture type.
abstract: This study investigated the effect of, and interactions between, contrasting crossbreed genetics (US Brown Swiss [BS] × Improved Braunvieh [BV] × Original Braunvieh [OB]) and feeding regimes (especially grazing intake and pasture type) on milk fatty acid (FA) profiles. Concentrations of total polyunsaturated FAs, total omega-3 FAs and trans palmitoleic, vaccenic, α-linolenic, eicosapentaenoic and docosapentaenoic acids were higher in cows with a low proportion of BS genetics. Highest concentrations of the nutritionally desirable FAs, trans palmitoleic, vaccenic and eicosapentaenoic acids were found for cows with a low proportion of BS genetics (0-24% and/or 25-49%) on high grazing intake (75-100% of dry matter intake) diets. Multivariate analysis indicated that the proportion of OB genetics is a positive driver for nutritionally desirable monounsaturated and polyunsaturated FAs while BS genetics proportion was positive driver for total and undesirable individual saturated FAs. Significant genetics × feeding regime interactions were also detected for a range of FAs.
authors.affiliation: Nafferton Ecological Farming Group, School of Agriculture Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland NE43 7XD, UK; Agri-Food and Biosciences Institute, Sustainable Agri-Food Sciences Division, Agriculture Branch, Large Park, Hillsborough, Co Down BT26 6DR, UK.
authors.forename: S
authors.initials: S
authors.lastname: Stergiadis
authors.affiliation: FiBL Research Institute of Organic Agriculture, Department of Livestock Sciences, Ackerstrasse 113, P.O. Box 219, CH-5070 Frick, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Bieber
authors.affiliation: University of Padua, Department of Animal Medicine, Production and Health, Viale dell' Università 16, Agripolis, 35020 Legnaro, Padua, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Franceschin
authors.affiliation: FiBL Research Institute of Organic Agriculture, Department of Livestock Sciences, Ackerstrasse 113, P.O. Box 219, CH-5070 Frick, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Isensee
authors.affiliation: Nafferton Ecological Farming Group, School of Agriculture Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland NE43 7XD, UK.
authors.forename: M D
authors.initials: MD
authors.lastname: Eyre
authors.affiliation: FiBL Research Institute of Organic Agriculture, Department of Livestock Sciences, Ackerstrasse 113, P.O. Box 219, CH-5070 Frick, Switzerland.
authors.forename: V
authors.initials: V
authors.lastname: Maurer
authors.affiliation: Nafferton Ecological Farming Group, School of Agriculture Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland NE43 7XD, UK.
authors.forename: E
authors.initials: E
authors.lastname: Chatzidimitriou
authors.affiliation: University of Padua, Department of Animal Medicine, Production and Health, Viale dell' Università 16, Agripolis, 35020 Legnaro, Padua, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Cozzi
authors.affiliation: Qualitas AG, Chamerstrasse 56, CH-6300 Zug, Switzerland.
authors.forename: B
authors.initials: B
authors.lastname: Bapst
authors.affiliation: Nafferton Ecological Farming Group, School of Agriculture Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland NE43 7XD, UK.
authors.forename: G
authors.initials: G
authors.lastname: Stewart
authors.affiliation: Agri-Food and Biosciences Institute, Finance & Corporate Affairs Division, Biometrics & Information Systems Branch, 18a Newforge Lane, Belfast, Co Antrim BT9 5PX, UK.
authors.forename: A
authors.initials: A
authors.lastname: Gordon
authors.affiliation: Nafferton Ecological Farming Group, School of Agriculture Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland NE43 7XD, UK. Electronic address: gillian.butler@ncl.ac.uk.
authors.forename: G
authors.initials: G
authors.lastname: Butler
mesh_terms: D000821:Animal Feed; D000818:Animals; D002417:Cattle / Q000235:genetics*; D003612:Dairying / Q000379:methods*; D005227:Fatty Acids / Q000032:analysis; D015525:Fatty Acids, Omega-3 / Q000032:analysis; D005260:Female; D065948:Grassland; D006824:Hybridization, Genetic; D008892:Milk / Q000737:chemistry*
chemical_list: D005227:Fatty Acids; D015525:Fatty Acids, Omega-3
keywords: Brown Swiss; Fatty acid; Low-input; Milk; Original Braunvieh