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Department of Dairy Science, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44691
ABSTRACT
Two trials ascertained whether feeding fatty acids as preformed calcium soaps would permit normal digestibility of fiber without reducing availabilities of fatty acids or energy. Six diets contained no added fat (control) or the equivalent of 4.5% added fatty acids as tallow or soy fatty acids, tallow or soy calcium soaps, or tallow combined with the nonnutritive carrier verxite. Six cows were fed each diet in trial 1 to ascertain digestibilities of total nutrients, whereas control, tallow fatty acid, and tallow soap diets were fed to steers with duodenal cannulsae in trial 2 to evaluate effects of fat source on rumen fermentation.
Digestibility of total fiber in trial 1 was reduced 13% by tallow fatty acids. In trial 2, tallow fatty acids markedly reduced digestibility of dry matter and fiber in the rumen. Diets supplemented with tallow calcium soaps had normal digestibilities of fiber in the rumen and totally, but digestibility of fatty acids was reduced 6% and digestibility of energy reduced 3% compared to feeding tallow fatty acids. Efficiency of synthesis of microbial protein was 39% higher for tallow fatty acids than for control. Feeding tallow verxite also permitted normal digestibility of fiber in trial 1 but caused reduced availabilities of fatty acids and energy.
Calcium soaps are an effective source of fat for dairy rations, because ruminal fermentation is normal, digestibility of fatty acids is high, and soaps are mixed easily with other feed ingredients.
1 Salaries and research support provided in part by Fats and Proteins Research Foundation, Des Plaines, IL 60018 and by State and Federal Funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State University. Journal Article No. 122-83.
2 Agricultural Technical Institute, The Ohio State University, Wooster 44691.
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