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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0913    [Accepted] Published online February 25, 2020.
Effects of ruminal administration of soy sauce oil on functional fatty acids in the rumen, blood and milk of dairy cows
Daiji Konno1  , Masanobu Takahashi2  , Ikuo Osaka2  , Takenori Orihashi3  , Kiyotaka Sakai3  , Kenji Sera3  , Yoshiaki Obara3  , Yasuo Kobayashi1,* 
1Hokkaido University, Sapporo, Japan
2Dairy Research Center, Hokkaido Research Organization, Nakashibetsu, Japan
3Mito Research Center, Meiji Feed Co., Ltd., Ibaraki, Japan
Correspondence:  Yasuo Kobayashi, Tel: +81-11-706-2476, Fax: +81-11-706-2476, Email: kyas@anim.agr.hokudai.ac.jp
Received: 29 November 2019   • Revised: 11 January 2020   • Accepted: 20 February 2020
Abstract
Objective
Soy sauce oil, a byproduct of whole soybean processing by the soy sauce industry, was evaluated as a source of linoleic acid for dairy cows for the purpose of manipulating the composition of milk.
Methods
Eight dairy Holstein cows fitted with rumen cannulas were used for ruminal administration of soy sauce oil for a 28-day period using a 4 x 4 Latin square study design with 4 doses (0, 200, 400 and 600 g soy sauce oil/d).
Results
Although dry matter intake and milk yield were not affected by soy sauce oil administration, ruminal concentrations of total volatile fatty acids and acetate were decreased, specifically at 600 g/d administration. While milk fat percentage was decreased with administration of soy sauce oil, proportions of linoleic, vaccenic and conjugated linoleic acids in the rumen, blood and milk were increased with increasing soy sauce oil dose.
Conclusion
These results suggest that soy sauce oil feeding could be useful for improving milk functionality without adverse effects on animal production performance when fed at less than 400 g/d.
Keywords: Dairy Cow; Fatty Acid; Milk; Rumen; Soy Sauce Oil


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