Variation in fatty acid composition of ewes' milk during continuous transition from dry winter to natural pasture diet |
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| Authors: | Ivan Ostrovský Eva Pavlíková Jaroslav Blaško Renáta Górová Róbert Kubinec Milan Margetín Ladislav Soják |
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| Affiliation: | 1. Australian Equine Laminitis Research Unit, School of Veterinary Science, University of Queensland, Gatton, QLD 4343, Australia;2. Radboud University Medical Centre Nijmegen, The Netherlands;3. Department of Experimental Molecular Imaging, University Clinic and Helmholtz Institute for Biomedical Engineering, RWTH-Aachen University, Aachen, Germany;4. Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), University of Utrecht, The Netherlands;5. Department of Pharmacy and Pharmacology, Sloterevaart Hospital, Amsterdam, The Netherlands;1. Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, MA, United States;2. Department of Obstetrics, Gynecology, and Reproductive Biology, Brigham and Women''s Hospital, Boston, MA;3. Harvard Medical School, Boston, MA, United States |
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| Abstract: | The profile variations of approximately 70 fatty acids (FAs) in milk of ewes consuming total mixed rations (TMR) and grazing natural pasture were determined. Milk of ewes grazing pasture in May and September in the Slovak Republic contained 3-times more conjugated linoleic acid (CLA) (P < 0.001) and trans-vaccenic acid (TVA) (P < 0.001), and 2-times more α-linolenic acid (ALA) (P < 0.001) than that of ewes fed TMR. A doubling of the CLA and TVA contents of milk of ewes fed with TMR was achieved by changing to meadow hay containing a higher ALA content. Less availability of vegetation and lower ALA pasture content in summer (P < 0.001) caused a 2-fold decrease (P < 0.001) of CLA and TVA contents when compared with data obtained in May. With grass re-growth and an increase in pasture ALA content in September, the CLA and TVA contents rose to values similar to those obtained in May (P > 0.05). No significant differences in the FA composition in milk of ewes grazing on summer pasture at higher altitude were observed. |
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