Part-time grazing improves sheep milk production and its nutritional characteristics
| Autor: | I. Beltrán de Heredia, J.C. Ruiz de Gordoa, Roberto Ruiz, N. Mandaluniz, Marta Albisu, Luis Javier R. Barron, F.J. Pérez-Elortondo, J. Arranz, Eunate Abilleira, Izaskun Valdivielso, G. Amores, María Ángeles Bustamante, A.I. Nájera, Mailo Virto, M. de Renobales |
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| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
geography geography.geographical_feature_category Triglyceride Trolox equivalent antioxidant capacity food and beverages General Medicine Biology Pasture Analytical Chemistry chemistry.chemical_compound chemistry Grazing Composition (visual arts) Food science Flock Sheep milk Food Science Polyunsaturated fatty acid |
| Zdroj: | Food Chemistry. 130:90-96 |
| ISSN: | 0308-8146 |
| DOI: | 10.1016/j.foodchem.2011.07.002 |
| Popis: | The positive effect of part-time grazing with three different amounts of indoor-supplied concentrate on milk production and quality was studied in an experimental flock of latxa sheep in mid-lactation. The group that received the highest amount of concentrate (group 3) ingested the least amount of grass during the 4 h the animals were on the pasture. Milk production increased by 30% ( p ⩽ 0.05) in the three groups that were allowed to graze as compared with the milk produced by the control group (group 0; always fed indoors). No change in the milk gross composition among the four experimental groups was observed. The milk from group 1 (which received the lowest amount of concentrate) had the highest concentration ( p ⩽ 0.05) of unsaturated fatty acids (FA), both total and polyunsaturated (PUFA), and the highest percent (56%) of non-atherogenic saturated FA ( p ⩽ 0.05) as compared to 49% in the control group. Consequently, the atherogenicity index of the milk from group 1 was the lowest ( p ⩽ 0.05) of all groups. In addition, the concentration of CLA isomer c9t11 in this milk was 50 μg/g fat, but only 15 μg/g fat in the control group and around 33 μg/g fat in groups 2 and 3. Changes in milk triglyceride composition were also observed between control group and grazing animals. The Trolox equivalent antioxidant capacity (TEAC) value of milks from groups 1 and 2 was higher than those of milks from groups 0 or 3. Curd firmness to compression was lowest ( p ⩽ 0.05) in milk from group 1. These results clearly indicate that part-time grazing is a viable alternative to intensive indoor sheep milk production which allows the use of locally available resources and improves the nutritional quality of the milk. |
| Databáze: | OpenAIRE |
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