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Commercial sheep flocks – fatty acid and fat-soluble antioxidant composition of milk and cheese related to changes in feeding management throughout lactation

Published online by Cambridge University Press:  29 June 2015

Izaskun Valdivielso ,
María Ángeles Bustamante ,
Arianna Buccioni ,
Oreste Franci ,
Juan Carlos Ruiz de Gordoa ,
Mertxe de Renobales  and
Luis Javier R Barron
Izaskun Valdivielso
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, University of the Basque Country UPV/EHU, Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
María Ángeles Bustamante
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, University of the Basque Country UPV/EHU, Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
Arianna Buccioni
Affiliation:
Dipartimento di Scienze delle Produzioni Agroalimentari e dell’ Ambiente, Università degli studi di Firenze, Via delle Cascine 5, 50144 Firenze, Italy
Oreste Franci
Affiliation:
Dipartimento di Scienze delle Produzioni Agroalimentari e dell’ Ambiente, Università degli studi di Firenze, Via delle Cascine 5, 50144 Firenze, Italy
Juan Carlos Ruiz de Gordoa
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, University of the Basque Country UPV/EHU, Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
Mertxe de Renobales
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, University of the Basque Country UPV/EHU, Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
Luis Javier R Barron*
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, University of the Basque Country UPV/EHU, Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
*
*For correspondence; e-mail: [email protected]
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Abstract

Fatty acids (FAs), tocopherols and retinoids were analysed in raw milk and cheese from six commercial sheep flocks monitored from early lactation in winter to late lactation in summer. In winter, animals received concentrate and forage indoors; in early spring, animals grazed part-time on cultivated or natural valley grasslands; and from mid spring on, animals were kept outdoors constantly on mountain natural pastures. Mountain grazing in late lactation significantly increased the amount of healthy desirable unsaturated FAs such as C18:1t11 (VA), C18:2c9t11 (RA), C18:2t11c13, C18:3c9c12c15 (ALA) and C20:5c5c8c11c14c17 (EPA), and those of α-tocopherol and α-tocotrienol of milk and cheese. Stepwise discriminant analysis was applied to classify cheese samples according to seasonal feeding management. The multivariate approach was able to discriminate beyond doubt mountain cheeses from those of indoor feeding and part-time valley grazing.

Keywords

Fatty acidstocopherolsmilkcheeseseasonal feedingsheep
Type
Research Article
Information
Journal of Dairy Research , Volume 82 , Issue 3 , August 2015 , pp. 334 - 343
Copyright
Copyright © Proprietors of Journal of Dairy Research 2015 

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