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The Linear Relationship Between the Proportion of Fresh Grass in the Cow Diet, Milk Fatty Acid Composition, and Butter Properties
Open accessAbstract
Fresh grass in the cow diet improves the rheological and nutritional properties of butter. However, the relationship between the proportion of fresh grass in the diet and these properties is still unknown. The objective of the study was to determine the relationship between the proportion of fresh grass in the diet and the properties of milk and butter. Four groups of 2 cows were fed 4 isoenergetic diets characterized by increasing amounts of fresh grass (0, 30, 60, and 100% dry matter of forage) according to a Youden square design. Energy levels were similar among all diets. Thus, no effect of mobilization was observed and the results were only due to the proportion of fresh grass in the diet. Milk yield linearly increased with the proportion of fresh grass in the diet (+0.21 kg/d per 10% of grass). Fat yield remained unchanged. Thus, by effect of dilution, increasing the proportion of fresh grass in the diet induced a linear decrease in fat content. Milk fat globule size decreased by 0.29 mum when the proportion of grass reached 30% in the diet. Increasing the proportion of fresh grass in the diet induced a linear increase in unsaturated fatty acids percentages at the expense of saturated fatty acids. Relationships were +0.38, +0.12, +0.05 and -0.69 points/10% of fresh grass in the diet for C18:1 trans-11, C18:2 cis-9,trans-11, C18:3n-3, and C16:0, respectively. These modifications in fatty acid composition, and in particular in the spreadability index, C16:0/C18:1, were responsible for linear decreases in final melting temperature and solid fat content in butter fat, perceived in sensory analysis by a linear decrease in firmness in mouth. The nutritional value of butter was also linearly improved by the proportion of fresh grass in the diet by halving the atherogenicity index.
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“a linear relationship has been noted between the proportion of fresh grass within the diet, and milk fat composition and butter properties in dairy cattle (Couvreur et al., 2006).”
From Addressing global ruminant agricultural challenges through understanding the rumen microbiome: past, present, and future (2018) · cites this paper as Couvreur et al., 2006
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Metadata
- Authors
- Couvreur, S., Hurtaud, C., Lopez, C., Delaby, L., & Peyraud, J. L.
- Affiliations
- Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR)
- Science et Technologie du Lait et de l'Oeuf (FR)
- Corresponding author
- Hurtaud, C.
- Venue
- Journal of Dairy Science
- Publisher
- American Dairy Science Association
- Published
- 2006-06
- Volume
- 89
- Issue
- 6
- Pages
- 1956-1969
- ISSN
- 0022-0302 (ISSN-L)
- OpenAlex
- W2012281535
- Cited by
- 325
- References
- 41
- Citations by year
- 2026: 12 · 2025: 11 · 2024: 20 · 2023: 15 · 2022: 17 · 2021: 36 · 2020: 26 · 2019: 16 · 2018: 16 · 2017: 14 · 2016: 17 · 2015: 12 · 2014: 17 · 2013: 18 · 2012: 12
- FWCI
- 28.43
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Journal of Dairy Science (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion)
- Funders
- European Centre for Dairy Research and Training
- Topics
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Ruminant Nutrition and Digestive Physiology
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Milk Quality and Mastitis in Dairy Cows
- Life Sciences › Agricultural and Biological Sciences › Food Science › Food Nutrient Composition and Product Development
- Keywords
- milk fatty acid composition, milk fat globule size, unsaturated fatty acids, dairy cattle nutrition
- MeSH terms
- Animals, Animal Feed, Butter, Energy Intake, Cattle, Chemistry, Physical, Diet, Fats, Fatty Acids, Female, Food Technology, Glycolipids, Glycoproteins, Poaceae, Milk, Particle Size, Sensation, Chemical Phenomena, Lipid Droplets
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