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Journal of Animal Science, Vol 75, Issue 8 2277-2283, Copyright © 1997 by American Society of Animal Science

JOURNAL ARTICLE

Ruminal fermentation and nutrient digestion in sheep fed hydroxyethylsoyamide

T. C. Jenkins
Department of Animal, Dairy, and Veterinary Sciences, Clemson University, SC 29630, USA.

Hydroxyethylsoyamide (HESA) was reported previously to protect soybean oil from ruminal biohydrogenation and increase plasma unsaturated fatty acids in sheep. Two digestibility trials with sheep and a rumen in vitro trials were conducted in this study to determine the effects of HESA on ruminal VFA and nutrient digestibility. Trial 1 was a 4 x 4 Latin square with 17-d periods in which four wethers were fed either a control diet (CON) with no added fat, 2.5% soybean oil (SBO), 5% butylsoyamide (BuSA), or 5% HESA. The HESA diet was ground with a mortar and pestle before feeding to disperse fat lumps that formed during diet mixing. Compared with the CON diet, the HESA diet reduced DMI, acetate/ propionate (A/P), and total tract fiber digestibility, but these were not affected by SBO or BuSA. Trial 2 was a 24-h rumen in vitro study showing that total VFA concentration and A/P in cultures were reduced by 10% linoleic acid but not by 10% ethanolamine or 10% HESA. In Trial 3, four wethers were fed the CON and HESA diets in a replicated 2 x 2 Latin square to determine digestibility responses to HESA when grinding was avoided. Fiber digestibilities and A/P were not affected by HESA in Trial 3. The HESA in this study had variable effects on fiber digestibility that may have been related to physical attributes of the diet, including particle size. Substitution of ethanolamine for butylamine during synthesis of the amide increased fatty acid digestibility but reduced dry matter intake.


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B. W. Hess, G. E. Moss, and D. C. Rule
A decade of developments in the area of fat supplementation research with beef cattle and sheep
J Anim Sci, April 1, 2008; 86(14_suppl): E188 - E204.
[Abstract] [Full Text] [PDF]


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Copyright © 1997 by the American Society of Animal Science.