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Effect of subacute ruminal acidosis on milk fat concentration, yield and fatty acid profile of dairy cows receiving soybean oil

Published online by Cambridge University Press:  09 June 2010

Ousama AlZahal ,
Mamun M Or-Rashid ,
Sabrina L Greenwood  and
Brian W McBride
Ousama AlZahal
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
Mamun M Or-Rashid
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
Sabrina L Greenwood
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
Brian W McBride*
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
*
*For correspondence; e-mail: bmcbride@uoguelph.ca
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Abstract

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.

Keywords

dietary fibreruminal pHmilk fat depressionsoybean oilfatty acidbiohydrogenation
Type
Research Article
Information
Journal of Dairy Research , Volume 77 , Issue 3 , August 2010 , pp. 376 - 384
Copyright
Copyright © Proprietors of Journal of Dairy Research 2010

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