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Milk concentration of the mammalian lignan enterolactone, milk production, milk fatty acid profile, and digestibility in dairy cows fed diets containing whole flaxseed or flaxseed meal

Published online by Cambridge University Press:  02 March 2009

Hélène V Petit*
Affiliation:
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, P O Box 90, Stn Lennoxville, Sherbrooke, QC J1M 1Z3, Canada
Nathalie Gagnon
Affiliation:
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, P O Box 90, Stn Lennoxville, Sherbrooke, QC J1M 1Z3, Canada
Priyadarshini S Mir
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge, AB T1J 4B1, Canada
Rong Cao
Affiliation:
Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada
Steve Cui
Affiliation:
Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada
*
For correspondence; e-mail: petith@agr.gc.ca

Abstract

A total of 24 lactating Holstein cows averaging 620 (se=29) kg of body weight were allotted at week 17 of lactation to eight groups of three cows blocked for similar days in milk to determine the effects of feeding two sources of the plant lignan precursor secoisolariciresinol diglucoside, whole flaxseed and flaxseed meal, on concentrations of the mammalian lignans (enterodiol and enterolactone) in milk. Feed intake, digestion, milk production and milk composition were also determined to compare the use of whole flaxseed and flaxseed meal for milk production. Cows within each block were assigned to one of the three isonitrogenous and isoenergetic total mixed diets: no flaxseed product; 10% flaxseed meal; or 10% whole flaxseed in the dry matter. The experiment was carried out from week 17 to week 21 of lactation and diets were fed at ad-libitum intake. The mammalian lignan, enterodiol, was not detected in the milk of cows. Cows fed whole flaxseed and flaxseed meal had greater concentrations of enterolactone in milk than those fed the control diet. Feed intake, milk production and milk composition were also similar for all diets, indicating that both flaxseed meal and whole flaxseed are suitable feed ingredients for milk production of cows in mid lactation. The results provide new information on the conversion of plant secoisolariciresinol diglucoside from two flaxseed products into mammalian lignans in dairy cows.

Type
Research Article
Copyright
Copyright © Proprietors of Journal of Dairy Research 2009

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