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Digestion, milk production and milk fatty acid profile of dairy cows fed flax hulls and infused with flax oil in the abomasum

Published online by Cambridge University Press:  21 July 2011

Cristiano Côrtes ,
Ricardo Kazama ,
Daniele da Silva-Kazama ,
Chaouki Benchaar ,
Lucia M Zeoula ,
Geraldo TD 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
Ricardo Kazama
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Maringa, Maringa, PR, Brazil
Daniele da Silva-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 TD 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: helene.petit@agr.gc.ca
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Abstract

Flax hull, a co-product obtained from flax processing, is a rich source of n-3 fatty acids (FA) but there is little information on digestion of flax hull based diets and nutritive value of flax hull for dairy production. Flax oil is rich in α-linolenic acid (LNA) and rumen bypass of flax oil contributes to increase n-3 FA proportions in milk. Therefore, the main objective of the experiment was to determine the effects of abomasal infusion of increasing amounts of flax oil on apparent digestibility, dry matter (DM) intake, milk production, milk composition, and milk FA profile with emphasis on the proportion of LNA when cows were supplemented or not with another source of LNA such as flax hull. Six multiparous Holstein cows averaging 650±36 kg body weight and 95±20 d in milk were assigned to a 6×6 Latin square design (21-d experimental periods) with a 2×3 factorial arrangement of treatments. Treatments were: 1) control, neither flax hull nor flax oil (CON), 2) diet containing (DM basis) 15·9% flaxseed hull (FHU); 3) CON with abomasal infusion of 250 g/d flax oil; 4) CON with abomasal infusion of 500 g/d flax oil; 5) FHU with abomasal infusion of 250 g/d flax oil; 6) FHU with abomasal infusion of 500 g/d flax oil. Infusion of flax oil in the abomasum resulted in a more pronounce decrease in DM intake for cows fed the CON diets than for those fed the FHU diets. Abomasal infusion of flax oil had little effect on digestibility and FHU supplementation increased digestibility of DM and crude protein. Milk yield was not changed by abomasal infusion of flax oil where it was decreased with FHU supplementation. Cows fed FHU had higher proportions of 18:0, cis9-18:1, trans dienes, trans monoenes and total trans in milk fat than those fed CON. Proportion of LNA was similar in milk fat of cows infused with 250 and 500 g/d flax oil in the abomasum. Independently of the basal diet, abomasal infusion of flax oil resulted in the lowest n-6:n-3 FA ratio in milk fat, suggesting that the most important factor for modification of milk FA profile was the amount of n-3 FA bypassing the rumen and not the amount of flax hull fed to dairy cows. Moreover, these data suggest that there is no advantage to supply more than 250 g/d of flax oil in the abomasum to increase the proportion of LNA in milk fat.

Keywords

milk fatty acidlinolenic acidlactating dairy cowabomasal infusionflaxnutrient digestibility
Type
Research Article
Information
Journal of Dairy Research , Volume 78 , Issue 3 , August 2011 , pp. 293 - 300
Copyright
Copyright © Proprietors of Journal of Dairy Research 2011

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