Potentials to differentiate milk composition by different feeding strategies
| Autor: | Tina Slots, Carlo Leifert, Jacob Holm Nielsen, Leif H. Skibsted, Gillian Butler, Troels Kristensen |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Linolenic acid
Silage Linoleic acid VACAS Biology Fats Feeding Methods chemistry.chemical_compound fluids and secretions Lactation Fatty Acids Omega-6 Fatty Acids Omega-3 Genetics medicine Animals Dry matter Food science Organic milk Dairy cattle chemistry.chemical_classification Principal Component Analysis food and beverages Diet Dairying medicine.anatomical_structure Milk chemistry Regression Analysis Animal Science and Zoology Cattle Female Food Organic Food Science Polyunsaturated fatty acid |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Slots, T, Butler, G, Leifert, C, Kristensen, T, Skibsted, L H & Nielsen, J H 2009, ' Potentials to Differentiate Milk Composition by Different Feeding Strategies ', Journal of Dairy Sciences, vol. 92, no. 5, pp. 2057-2066 . https://doi.org/10.3168/jds.2008-1392 |
| ISSN: | 1525-3198 |
| DOI: | 10.3168/jds.2008-1392 |
| Popis: | To investigate the effect of the dietary intake of the cow on milk composition, bulk-tank milk was collected on 5 occasions from conventional (n = 15) and organic (n = 10) farms in Denmark and on 4 occasions from low-input nonorganic farms in the United Kingdom, along with management and production parameters. Production of milk based on feeding a high intake of cereals, pasture, and grass silage resulted in milk with a high concentration of alpha-linolenic acid (9.4 +/- 0.2 mg/kg of fatty acids), polyunsaturated fatty acids (3.66 +/- 0.07 mg/kg of fatty acids), and natural stereoisomer of alpha-tocopherol (RRR-alpha-tocopherol, 18.6 +/- 0.5 mg/kg of milk fat). A milk production system using a high proportion of maize silage, by-products, and commercial concentrate mix was associated with milk with high concentrations of linoleic acid (LA; 19.7 +/- 0.4 g/kg of fatty acids), monounsaturated fatty acids (27.5 +/- 0.3 mg/kg of fatty acids), and a high ratio between LA and alpha-linolenic acid (4.7 +/- 0.2). Comparing these 2 production systems with a very extensive nonorganic milk production system relying on pasture as almost the sole feed (95 +/- 4% dry matter intake), it was found that the concentrations of conjugated LA (cis-9,trans-11; 17.5 +/- 0.7 g/kg of fatty acids), trans-11-vaccenic acid (37 +/- 2 g/kg of fatty acids), and monounsaturated fatty acids (30.4 +/- 0.6 g/kg of fatty acids) were higher in the extensively produced milk together with the concentration of antioxidants; total alpha-tocopherol (32.0 +/- 0.8 mg/kg of milk fat), RRR-alpha-tocopherol (30.2 +/- 0.8 mg/kg of milk fat), and beta-carotene (9.3 +/- 0.5 mg/kg of milk fat) compared with the organic and conventional milk. Moreover, the concentration of LA (9.2 +/- 0.7 g/kg of fatty acids) in milk from the extensive milk production system was found to approach the recommended unity ratio between n-6 and n-3, although extensive milk production also resulted in a lower daily milk yield. |
| Databáze: | OpenAIRE |
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