| Milk composition, milk fatty acid profile, digestion, and ruminal fermentation in dairy cows fed whole flaxseed and calcium salts of flaxseed oil. | |
| | |
MedLine Citation:
|
PMID: 20630232 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Four ruminally lactating Holstein cows averaging 602+/-25 kg of body weight and 64+/-6 d in milk at the beginning of the experiment were randomly assigned to a 4 x 4 Latin square design to determine the effects of feeding whole flaxseed and calcium salts of flaxseed oil on dry matter intake, digestibility, ruminal fermentation, milk production and composition, and milk fatty acid profile. The treatments were a control with no flaxseed products (CON) or a diet (on a dry matter basis) of 4.2% whole flaxseed (FLA), 1.9% calcium salts of flaxseed oil (SAL), or 2.3% whole flaxseed and 0.8% calcium salts of flaxseed oil (MIX). The 4 isonitrogenous and isoenergetic diets were fed for ad libitum intake. Experimental periods consisted of 21 d of diet adaptation and 7 d of data collection and sampling. Dry matter intake, digestibility, milk production, and milk concentrations of protein, lactose, urea N, and total solids did not differ among treatments. Ruminal pH was reduced for cows fed the CON diet compared with those fed the SAL diet. Propionate proportion was higher in ruminal fluid of cows fed CON than in that of those fed SAL, and cows fed the SAL and CON diets had ruminal propionate concentrations similar to those of cows fed the FLA and MIX diets. Butyrate concentration was numerically higher for cows fed the SAL diet compared with those fed the FLA diet. Milk fat concentration was lower for cows fed SAL than for those fed CON, and there was no difference between cows fed CON and those fed FLA and MIX. Milk yields of protein, fat, lactose, and total solids were similar among treatments. Concentrations of cis-9 18:1 and of intermediates of ruminal biohydrogenation of fatty acids such as trans-9 18:1 were higher in milk fat of cows fed SAL and MIX than for those fed the CON diet. Concentration of rumenic acid (cis-9, trans-11 18:2) in milk fat was increased by 63% when feeding SAL compared with FLA. Concentration of alpha-linolenic acid was higher in milk fat of cows fed SAL and MIX than in milk of cows fed CON (75 and 61%, respectively), whereas there was no difference between FLA and CON. Flaxseed products (FLA, SAL, and MIX diets) decreased the n-6 to n-3 fatty acid ratio in milk fat. Results confirm that flax products supplying 0.7 to 1.4% supplemental fat in the diet can slightly improve the nutritive value of milk fat for better human health. |
| | |
Authors:
|
C Côrtes; D C da Silva-Kazama; R Kazama; N Gagnon; C Benchaar; G T D Santos; L M Zeoula; H V Petit |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Journal of dairy science Volume: 93 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2010 Jul |
Date Detail:
|
Created Date: 2010-07-15 Completed Date: 2010-12-14 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
|
Languages: eng Pagination: 3146-57 Citation Subset: IM |
Copyright Information:
|
Copyright (c) 2010 American Dairy Science Association. Published by Elsevier Inc. All rights reserved. |
Affiliation:
|
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Stn. Lennoxville, Sherbrooke, QC J1M 1Z3, Canada. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animal Feed
/
analysis,
standards Animals Body Weight / physiology Calcium / administration & dosage, metabolism Cattle Dairying Diet / veterinary Digestion / physiology* Eating / physiology Fatty Acids / analysis* Female Fermentation / physiology* Flax / metabolism* Lactation / physiology Linseed Oil / administration & dosage, metabolism* Milk / chemistry*, secretion Nitrogen / metabolism Rumen / metabolism* Salts / administration & dosage, metabolism |
| Chemical | |
Reg. No./Substance:
|
0/Fatty Acids; 0/Salts; 7440-70-2/Calcium; 7727-37-9/Nitrogen; 8001-26-1/Linseed Oil |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Natural populations of lactic acid bacteria isolated from vegetable residues and silage fermentation...
Next Document: Effect of dietary crude protein modification on ammonia and nitrous oxide concentration on a tie-sta...