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Effect of feeding linseed oil in diets differing in forage to concentrate ratio: 2. Milk lactone profile

Published online by Cambridge University Press:  02 January 2014

Leacady Saliba ,
Rachel Gervais ,
Yolaine Lebeuf ,
Jean-Christophe Vuillemard ,
Jacinthe Fortin  and
P Yvan Chouinard
Leacady Saliba
Affiliation:
Département des sciences animales, Université Laval, Québec, Québec, CanadaG1V 0A6
Rachel Gervais
Affiliation:
Département des sciences animales, Université Laval, Québec, Québec, CanadaG1V 0A6
Yolaine Lebeuf
Affiliation:
Département des sciences animales, Université Laval, Québec, Québec, CanadaG1V 0A6
Jean-Christophe Vuillemard
Affiliation:
Département des sciences des aliments et de nutrition, Université Laval, Québec, Québec, CanadaG1V 0A6
Jacinthe Fortin
Affiliation:
Food Research and Development Centre, Agriculture and Agri-Food Canada, Saint-Hyacinthe, Québec, CanadaJ2S 8E3
P Yvan Chouinard*
Affiliation:
Département des sciences animales, Université Laval, Québec, Québec, CanadaG1V 0A6
*
*For correspondence; e-mail: [email protected]
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Abstract

Lactones are important contributors to the flavour and aroma of milk and dairy products. This study was conducted to evaluate the effects of dietary linseed oil (LO) and forage to concentrate ratio on milk lactone profile. Twenty four Holstein cows were used during a 4-week feeding trial in a randomised complete block design. Cows were fed diets containing 30% (LC) or 70% (HC) concentrate, and 0% (NLO) or 3% LO in a 2×2 factorial arrangement of treatments. Milk lactone profile was evaluated using the solid phase microextraction technique. The highest levels of δ-lactones (δ-6:0, δ-8:0, δ-10:0, and δ-12:0) were found with the LC/NLO diet. These concentrations were then decreased when cows received either a high level of concentrate or supplemental LO, but these effects were not additive (interaction of LO by concentrate, P<0·01). An interaction of LO by concentrate (P<0·01) was also noted on milk γ-12:0 for which the highest concentration was observed when supplementing LO in HC diet, while no effect was apparent when LO was added in LC diet. Moreover, feeding HC increased the level of γ-12:1 in milk as compared with LC, while LO had no effect on this γ-lactone. Finally, γ-12:2 was not detected in any of the milk samples studied. Organoleptic properties of milk were evaluated in a triangle test showing that a significant number of assessors perceived a difference between milk from cows fed LC/NLO as compared with milk from cows fed HC/LO. The sensory evaluation was completed by a ranking test where the intensities of fresh lactic, foreign and global flavours were not different between treatments. In conclusion, feeding LO in HC diet modified milk lactone profile with a shift toward more γ- and less δ-lactones as compared with LC diet not supplemented with LO. A difference was perceived in a triangle test between milk from these two treatments, but the sensory attributes responsible for this difference have not been identified in the current trial.

Keywords

Dairy cowflaxseedlactoneforage to concentrate ratio
Type
Research Article
Information
Journal of Dairy Research , Volume 81 , Issue 1 , February 2014 , pp. 91 - 97
Copyright
Copyright © Proprietors of Journal of Dairy Research 2014 

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