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KMID : 1025520040460050783
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Journal of Animal Science and Technology
2004 Volume.46 No. 5 p.783 ~ p.798
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Effects of Supplemental Vegetable Oils on Ruminal Characteristics, Digestibility and Formation of Fatty Acid Soaps in Sheep
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Kim D. I.
Choi J. R.
Cho S. H.
Lee D. H.
Chung T. Y.
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Abstract
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This experiment were conducted to determine the formation of fatty acid soaps, digestibility and ruminal characteristics when vegetable oils were added. Three Corriedale×Suffolk sheep fitted with rumen cannula were used in a 3×3 Latin square design. Sheep were fed one of three diets consisting of alfalfa hay and concentrates in a ratio of 70:30. Dietary treatments were 1) no oil, 2) 7% soybean oil and 3) 7% corn oil. At the end of each experimental period, rumen contents from each sheep were collected before feeding and at 1, 3, 6 and 9h after feeding. pH decreased up to the 3 hour after feeding and increased until the end of the collection(P<0.0001). Whereas the concentration of NH3-N showed inverse changes to pH(P<0.0001). Type of oil did not affect the molar concentration of total VFA, acetate, propionate and butyrate. Acetic/propionic acid (A/P) ratio decreased with increasing time(P<0.0001), but the ratio at the end of the experiment became similar to the initial value. No effects were found in the digestibility of dry matter, total-N, crude fiber, ash, NFE, NDF and ADF. The formation of fatty acid soaps(FAS) increased after feeding than 1 hour before feeding(P<0.05) and increased in 7% oils than no oil addition(P<0.05). Long chain fatty acids formed mainly FAS. Since the formation of FAS might decrease negative effects on ruminal characteristics and total tract digestibility.
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KEYWORD
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Vegetable oil, Fatty acid soaps, Ruminal characteristics, Digestibility
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