| Effect of subacute ruminal acidosis on milk fat concentration, yield and fatty acid profile of dairy cows receiving soybean oil. | |
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MedLine Citation:
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PMID: 20529409 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The objective of this study was to investigate the effect of ruminal infusion of soybean oil (SBO) with either a moderate- or high-forage diet on fat concentration, yield and composition in milk from dairy cows. Six rumen-fistulated Holstein dairy cows (639+/-51 kg body weight, 140+/-59 days in milk) were used in the study. Cows were randomly assigned to one of two dietary treatments, a high forage:concentrate (HFC, 74:26) or a moderate forage:concentrate (MFC, 56:44) total mixed ration. Cows were fed at 08.00 and 13.00 h and pulse-dosed ruminally at 13.00 h over a 10-min duration with 2% of diet dry matter of SBO. Ruminal pH was recorded continuously. Cows receiving the MFC treatment had lower daily mean ruminal pH and ruminal pH was below 6.0 for a longer duration compared with the HFC treatment (640 vs. 262 min/d, P<0.05). Cows receiving the MFC treatment had a greater reduction (diet by week interaction, P<0.05) in milk fat concentration and yield than cows receiving the HFC treatment (42 vs. 22% and 45 vs. 21%, respectively). Additionally, cows receiving the MFC diet had a greater reduction in milk fat concentration (g/100 g FA) of FA <C16 (14 vs. 8%), and a greater increase in concentration of FA >C16 (17 vs. 9%), trans-10 18:1 (159 vs. 21%) and trans-9, cis-11 conjugated linoleic acid (121 vs. 55%) (P<0.05) compared with cows receiving the HFC diet. This study demonstrated that cows fed the MFC diet had lower ruminal pH and showed a greater rate of milk fat depression when infused with SBO. |
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Authors:
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Ousama Alzahal; Mamun M Or-Rashid; Sabrina L Greenwood; Brian W McBride |
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Publication Detail:
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Type: Journal Article Date: 2010-06-09 |
Journal Detail:
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Title: The Journal of dairy research Volume: 77 ISSN: 1469-7629 ISO Abbreviation: J. Dairy Res. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-06-25 Completed Date: 2010-10-01 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985125R Medline TA: J Dairy Res Country: England |
Other Details:
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Languages: eng Pagination: 376-84 Citation Subset: IM |
Affiliation:
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Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada, N1G 2W1. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acidosis
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veterinary* Animal Feed Animals Cattle Diet / veterinary Fatty Acids / analysis* Female Hydrogen-Ion Concentration Lactation / drug effects, physiology Linoleic Acids, Conjugated / analysis Milk / chemistry* Rumen / drug effects, physiology* Soybean Oil / pharmacology* |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids; 0/Linoleic Acids, Conjugated; 8001-22-7/Soybean Oil |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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