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Intake and digestibility of fatty acids in late-lactating dairy cows fed flaxseed hulls supplemented with monensin

Published online by Cambridge University Press:  13 September 2011

Cristiano Côrtes ,
Daniele da Silva-Kazama ,
Ricardo Kazama ,
Chaouki Benchaar ,
Lucia M Zeoula ,
Geraldo T D Santos  and
Hélène V Petit
Cristiano Côrtes
Affiliation:
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Stn Lennoxville, Sherbrooke, QC J1M 1Z3, Canada
Daniele da Silva-Kazama
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Maringa, Maringa, PR, Brazil
Ricardo Kazama
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Maringa, Maringa, PR, Brazil
Chaouki Benchaar
Affiliation:
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Stn Lennoxville, Sherbrooke, QC J1M 1Z3, Canada
Lucia M Zeoula
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Maringa, Maringa, PR, Brazil
Geraldo T D Santos
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Maringa, Maringa, PR, Brazil
Hélène V Petit*
Affiliation:
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Stn Lennoxville, Sherbrooke, QC J1M 1Z3, Canada
*
*For correspondence; e-mail: [email protected]
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Abstract

Flaxseed hull, a co-product obtained from flax processing, is a rich source of n−3 fatty acids but there is little information on digestibility of its nutrients by dairy cows. Four rumen-cannulated multiparous Holstein cows averaging 665±21 kg of body weight and 190±5 d in milk at the beginning of the experiment were assigned to a 4×4 Latin square design with four 28-d experimental periods to determine the effects of feeding monensin and flaxseed hulls on total tract apparent digestibility of nutrients and fatty acids. The four treatments were: (1) diet CO: control with neither flaxseed hulls nor monensin added; (2) diet FH containing 19·8 g flaxseed hulls/100 g dry matter (DM); (3) diet MO with 16 mg monensin/kg DM; (4) diet HM containing 19·8 g flaxseed hulls/100 g DM and 16 mg monensin/kg DM. Diets provided similar amounts of protein and net energy of lactation. Digestibility of crude protein was higher for diets containing flaxseed hulls and for diets supplemented with monensin. Flaxseed hulls supplementation decreased digestibility of acid and neutral detergent fibre. Significantly higher digestibility of ether extract and individual fatty acids was observed for treatments with flaxseed hulls compared with treatments without flaxseed hulls. A combination of flaxseed hulls and monensin did not result in better fatty acid digestibility than when feeding only flaxseed hulls.

Keywords

Dairy cattlefatty acidsmonensindigestion
Type
Research Article
Information
Journal of Dairy Research , Volume 78 , Issue 4 , November 2011 , pp. 391 - 395
Copyright
Copyright © Proprietors of Journal of Dairy Research 2011

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