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Changes in fatty acid profile of Bovec sheep milk due to different pasture altitude

Published online by Cambridge University Press:  12 October 2018

A. Cividini ,
M. Simčič ,
V. Stibilj ,
M. Vidrih  and
K. Potočnik
A. Cividini*
Affiliation:
Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
M. Simčič
Affiliation:
Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
V. Stibilj
Affiliation:
Department of Environmental Science, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
M. Vidrih
Affiliation:
Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
K. Potočnik
Affiliation:
Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
*
†E-mail: [email protected]
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Abstract

Sheep rearing on mountain pastures is an ancestral tradition in northwestern Slovenia. The indigenous Bovec sheep are widespread there and are well adapted to the rough Alpine rearing conditions. Every year, after weaning, the sheep start grazing in the lowlands (L) and then gradually move to mountain pastures, and finally, to the highland (H) pastures of the Alps. Grazing positively affects the fatty acid (FA) composition in sheep milk fat with increased availability of polyunsaturated FA (PUFA) in grass, and subsequently, in milk. Consequently, the objective of this work was to study the FA profile in sheep milk during grazing in four geographical areas in the Alps. A total of 15 ewes of the Bovec sheep breed were randomly selected and milk samples from these ewes were taken at four different pasture locations that differed with regard to altitude: the L pasture location at an altitude of 480 m, the mountain pastures (M1 and M2) at altitudes of 1100 to 1300 m and 1600 to 1900 m, respectively, and the H pastures at altitudes of 2100 to 2200 m. Milk samples from the ewes were taken during the grazing season from April to September. The chemical and FA composition of the milk samples from each pasture location were determined. There were significant differences in the concentrations of FA among the L, M1, M2 and H milk samples. We observed decreases of the concentrations of saturated FA (SFA) in milk from L to H pastures. The concentration of α-linolenic FA, monounsaturated FA (MUFA), PUFA and n-3 PUFA in milk were increased significantly with pasture altitude. The n-6/n-3 PUFA ratio was reduced by the change of pasture altitude with the lowest value at the M1 pasture (1.5). The concentrations of total SFA decreased significantly and was lowest at the L pasture. Our results underline the importance of the effect of grazing in the Alpine region associated with pasture altitude on the FA profile of sheep milk. The first variation in FA concentration in sheep milk occurred between L and M1, although it was more evident on H pastures in the Alpine mountains. Changes of the FA profile in sheep milk due to pasture altitude were related to variation in FA concentration in the pasture and the botanical composition of the pasture location.

Keywords

grazinglowlandhighlandmilk fatewe
Type
Research Article
Information
animal , Volume 13 , Issue 5 , May 2019 , pp. 1111 - 1118
Copyright
© The Animal Consortium 2018 

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References

Agabriel, J 2007. Alimentation des bovins, ovins et caprins: besoins des animaux, valeurs des aliments: tables Inra, Guide pratique, Éditions Quae, c/o Inra, Versailles Cedex, France.Google Scholar
Association of Official Analytical Chemists (AOAC) 2000. Official methods of analysis, 17th edition. AOAC, Gaithersburg, MD, USA.Google Scholar
Atti, N, Rouissi, H and Othmane, MH 2006. Milk production, milk fatty acid composition and conjugated linoleic acid (CLA) content in dairy ewes raised on feedlot or grazing pasture. Livestock Science 104, 121–127.Google Scholar
Biondi, L, Valvo, MA, Di Gloria, M, Scinardo Tenghi, E, Galofaro, V and Priolo, A 2008. Changes in ewe milk fatty acids following turning out to pasture. Small Ruminant Research 75, 17–23.10.1016/j.smallrumres.2007.07.004Google Scholar
Braun-Blanquet, J 1964. Grundzüge der vegetationskunde. In Planzensociologie, 3rd edition. Springer-Verlag, Wien, Austria.Google Scholar
Bugaud, C, Buchin, S, Coulon, JB and Hauwuy, A 2001a. Relationship between flavour and chemical composition of abundance cheese derived from different types of pastures. Lait 81, 757–773.10.1051/lait:2001162Google Scholar
Bugaud, C, Buchin, S, Coulon, JB, Hauwuy, A and Dupont, D 2001b. Influence of the nature of alpine pastures on plasmin activity, fatty acid and volatile compound composition of milk. Lait 81, 401–414.10.1051/lait:2001140Google Scholar
Cabiddu, A, Decandia, M, Addis, M, Piredda, G, Pirisi, A and Molle, G 2005. Managing Mediterranean pastures in order to enhance the level of beneficial fatty acids in sheep milk. Small Ruminant Research 59, 169–180.Google Scholar
Cabiddu, A, Decandia, M, Molle, G, Pinna, G, Addis, M, Spada, S, Pirisi, A and Piredda, G 2003. Effect of different pastures on CLA content in milk and sheep cheese. In Proceedings of the ASPA XV Congress, Parma, Italy, vol II, pp. 518–520.Google Scholar
Collomb, M, Bütikofer, U, Sieber, R, Jeangros, B and Bosset, JO 2002a. Correlation between fatty acids in cow’s milk fat produced in the lowland, mountains and highlands of Switzerland and botanical composition of the fodder. International Dairy Journal 12, 661–666.Google Scholar
Collomb, M, Bütikofer, U, Sieber, R, Jeangros, B and Bosset, JO 2002b. Composition of fatty acids in cow’s milk fat produced in the lowlands, mountains and highlands of Switzerland using high-resolution gas chromatography. International Dairy Journal 12, 649–659.Google Scholar
Cook, ME and Pariza, M 1998. The role of conjugated linoleic acid (CLA) in health. International Dairy Journal 8, 459–462.Google Scholar
De Renobales, M, Amores, G, Arranz, J, Virto, M, Barrón, LJR, Bustamante, MA, Ruiz de Gordoa, JC, Nájera, AI, Valdivielso, I, Abilleira, E, Beltrán de Heredia, I, Pérez-Elortondo, FJ, Ruiz, R, Albisu, M and Mandaluniz, N 2012. Part-time grazing improves sheep milk production and its nutritional characteristics. Food Chemistry 130, 90–96.Google Scholar
Dietl, W 1987. Standortgemässe nutzung von mäwiesen und weiden im berggebiet. Zeitschrift für Kulturtechnik und Flurbereinigung 28, 329–336.Google Scholar
Feldman, A, Bietzker, U and Mendel, C 2005. Schafrassen in der Alpen, 1st edition. Druckerei Tutte GmbH, Passau, Germany.Google Scholar
Hilali, M, El-Mayda, E and Rischkowsky, B 2011. Characteristics and utilization of sheep and goat milk in the middle east. Small Ruminant Research 101, 92–101.Google Scholar
International Committee of Animal Recording (ICAR) 2011. Guidelines approved by the general assembly. International Agreement of Recording Practices, Riga, Latvia.Google Scholar
Leiber, F, Kreuzer, M, Nigg, D, Wettstein, HR and Scheeder, MRL 2005. A study on the causes for the elevated n-3 fatty acids in cows’ milk of alpine origin. Lipids 40, 191–202.Google Scholar
Mariaca, RG, Berger, TFH, Gauch, R, Imhof, MI, Jeangros, B and Bosset, JO 1997. Occurrence of volatile mono- and sesquiterpenoids in highland and lowland plant species as possible precursors for flavour compounds in milk and dairy products. Journal of Agriculture and Food Chemistry 45, 4423–4434.Google Scholar
Mel’uchová, B, Blaško, J, Kubinec, R, Górová, R, Dubravská, J, Margetín, M and Soják, L 2008. Seasonal variations in fatty acid composition of pasture forage plants and CLA content in ewe milk fat. Small Ruminant Research 78, 56–65.10.1016/j.smallrumres.2008.05.001Google Scholar
Min, BR, Barry, TN, Attwood, GT and McNabb, WC 2003. The effect of condensed tannins on the nutrition and health of ruminants fed fresh temperate forages: a review. Animal Feed Science and Technology 106, 3–19.Google Scholar
Morand-Fehr, P, Fedele, V, Decandia, M and Le Frileux, Y 2007. Influence of farming and feeding systems on composition and quality of goat and sheep milk. Small Ruminant Research 68, 20–34.Google Scholar
Offer, NW, Mardsen, M, Dixon, J, Speake, BK and Thacker, FE 1999. Effect of dietary fat supplements on levels of n-3 poly-unsaturated fatty acids, trans acids and conjugated linoleic acid in bovine milk. Animal Science 69, 613–625.Google Scholar
Oravcová, M, Margetín, M, Preškovičová, D, Daňo, J, Milerski, M, Hetényi, L and Polák, P 2007. Factors affecting ewe’s milk fat and protein content and relationships between milk yield and milk components. Czech Journal of Animal Science 7, 189–198.Google Scholar
Ostrovský, I, Pavlíková, E, Blaško, J, Górová, R, Kubinec, R, Margetín, M and Soják, L 2009. Variation in fatty acid composition of ewes’ milk during continuous transition from dry winter to natural pasture diet. International Dairy Journal 19, 545–549.Google Scholar
Park, PW and Goins, RE 1994. In situ preparation of fatty acid methyl esters for analysis of fatty acid composition in foods. Journal of Food Science 59, 1262–1266.Google Scholar
Revello Chion, A, Tabacco, E, Giaccone, D, Peiretti, PG, Battelli, G and Borreani, G 2010. Variation of fatty acid and terpene profiles in mountain milk and “Toma piemontese” cheese as affected by diet composition in different seasons. Food Chemistry 121, 393–399.Google Scholar
SAS Institute Inc 2001. The SAS system for windows, release 9.2. Cary, NC, USA.Google Scholar
Tsiplakou, E, Mountzouris, KC and Zervas, G 2006. Concentration of conjugated linoleic acid in grazing sheep and goat milk fat. Livestock Science 103, 74–84.Google Scholar
Wright, T, McBride, B and Holub, B 1998. Docosahexaenoic acid-enriched milk. World Review of Nutrition and Dietetics 83, 160–165.10.1159/000059660Google Scholar