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Effects of new n-3 fatty acid sources on milk fatty acid profile and milk fat properties in dairy cows.
J Dairy Res. 2018 Aug; 85(3):265-272.JD

Abstract

Feeding livestock with n-3 fatty acid (FA) sources (linseed, for example) is a common strategy to improve lipid quality of meat and milk products. However, in monogastric animals, linseed tegument decreases digestibility and alphalinolenic acid (ALA) uptake, while the whole linseed is well used by ruminants. In a context of increasing sustainability of feeding systems, providing monogastric animals and ruminants with linseed products adapted to their digestive systems is an important issue. This research paper addresses the hypotheses: (i) sieved extruded linseed (SEL) specific for ruminants is as or more effective than standard extruded linseed (ii) microalgae DHA Gold® is an interesting source of docosahexaenoic acid (DHA) in feedstuff and (iii) the effects of SEL and microalgae on milk characteristics are complementary and additive. Thirty-two cows were divided into 4 groups with different dietary n-3 fatty acid sources using a continuous design. All the diets were fed as mixed rations based on maize silage, energy concentrate and soybean meal. The first group received a control diet (CTRL) with no additional fat. The 3 other groups received SEL, microalgae DHA Gold® (ALG) and a mixture of microalgae DHA Gold® and SEL (SEL/ALG). Milk was collected from morning milkings after six weeks of dietary treatment. In SEL and SEL/ALG, ALA increased (+0·32 and +0·26% unit, respectively), and DHA increased in ALG and SEL/ALG (+0·43 and +0·15% unit, respectively) compared to CTRL, as a consequence of the initial composition of the n-3 FA sources. In SEL, milk yield, fat and protein contents, milk fat globule size and spontaneous lipolysis (measured to evaluate suitability for milk processing) were not different compared with CTRL. In ALG and SEL/ALG, milk yield decreased (-2·8 and -6·0 kg/d, respectively), fat content was halved, and fat globule size was reduced (-1·46 and -1·31 µm, respectively) compared to CTRL. Spontaneous lipolysis increased in ALG (+0·12 mEq/kg of milk) compared to CTRL. Protected microalgae and the doses of microalgae in the diet need further investigation to prevent FA modification in the rumen and the consequent deleterious effects on milk fat.

Authors+Show Affiliations

PEGASE, Agrocampus Ouest, INRA,35590,Saint-Gilles,France.PEGASE, Agrocampus Ouest, INRA,35590,Saint-Gilles,France.PEGASE, Agrocampus Ouest, INRA,35590,Saint-Gilles,France.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29941054

Citation

Vanbergue, Elise, et al. "Effects of New N-3 Fatty Acid Sources On Milk Fatty Acid Profile and Milk Fat Properties in Dairy Cows." The Journal of Dairy Research, vol. 85, no. 3, 2018, pp. 265-272.
Vanbergue E, Peyraud JL, Hurtaud C. Effects of new n-3 fatty acid sources on milk fatty acid profile and milk fat properties in dairy cows. J Dairy Res. 2018;85(3):265-272.
Vanbergue, E., Peyraud, J. L., & Hurtaud, C. (2018). Effects of new n-3 fatty acid sources on milk fatty acid profile and milk fat properties in dairy cows. The Journal of Dairy Research, 85(3), 265-272. https://doi.org/10.1017/S0022029918000390
Vanbergue E, Peyraud JL, Hurtaud C. Effects of New N-3 Fatty Acid Sources On Milk Fatty Acid Profile and Milk Fat Properties in Dairy Cows. J Dairy Res. 2018;85(3):265-272. PubMed PMID: 29941054.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of new n-3 fatty acid sources on milk fatty acid profile and milk fat properties in dairy cows. AU - Vanbergue,Elise, AU - Peyraud,Jean-Louis, AU - Hurtaud,Catherine, Y1 - 2018/06/26/ PY - 2018/6/27/pubmed PY - 2018/11/21/medline PY - 2018/6/27/entrez KW - Flaxseed KW - dairy cow KW - lipolysis KW - microalgae KW - milk quality SP - 265 EP - 272 JF - The Journal of dairy research JO - J Dairy Res VL - 85 IS - 3 N2 - Feeding livestock with n-3 fatty acid (FA) sources (linseed, for example) is a common strategy to improve lipid quality of meat and milk products. However, in monogastric animals, linseed tegument decreases digestibility and alphalinolenic acid (ALA) uptake, while the whole linseed is well used by ruminants. In a context of increasing sustainability of feeding systems, providing monogastric animals and ruminants with linseed products adapted to their digestive systems is an important issue. This research paper addresses the hypotheses: (i) sieved extruded linseed (SEL) specific for ruminants is as or more effective than standard extruded linseed (ii) microalgae DHA Gold® is an interesting source of docosahexaenoic acid (DHA) in feedstuff and (iii) the effects of SEL and microalgae on milk characteristics are complementary and additive. Thirty-two cows were divided into 4 groups with different dietary n-3 fatty acid sources using a continuous design. All the diets were fed as mixed rations based on maize silage, energy concentrate and soybean meal. The first group received a control diet (CTRL) with no additional fat. The 3 other groups received SEL, microalgae DHA Gold® (ALG) and a mixture of microalgae DHA Gold® and SEL (SEL/ALG). Milk was collected from morning milkings after six weeks of dietary treatment. In SEL and SEL/ALG, ALA increased (+0·32 and +0·26% unit, respectively), and DHA increased in ALG and SEL/ALG (+0·43 and +0·15% unit, respectively) compared to CTRL, as a consequence of the initial composition of the n-3 FA sources. In SEL, milk yield, fat and protein contents, milk fat globule size and spontaneous lipolysis (measured to evaluate suitability for milk processing) were not different compared with CTRL. In ALG and SEL/ALG, milk yield decreased (-2·8 and -6·0 kg/d, respectively), fat content was halved, and fat globule size was reduced (-1·46 and -1·31 µm, respectively) compared to CTRL. Spontaneous lipolysis increased in ALG (+0·12 mEq/kg of milk) compared to CTRL. Protected microalgae and the doses of microalgae in the diet need further investigation to prevent FA modification in the rumen and the consequent deleterious effects on milk fat. SN - 1469-7629 UR - https://www.unboundmedicine.com/medline/citation/29941054/Effects_of_new_n_3_fatty_acid_sources_on_milk_fatty_acid_profile_and_milk_fat_properties_in_dairy_cows_ L2 - https://www.cambridge.org/core/product/identifier/S0022029918000390/type/journal_article DB - PRIME DP - Unbound Medicine ER -