Effect of medium chain and long chain fatty acid calcium salts on rumen microorganisms and fiber digestion in sheep

Ushida, K.; Umeda, M.; Kishigami, N.; Kojima, Y.

Animal Science and Technology 63(6): 591-597


DOI: 10.2508/chikusan.63.591
Accession: 007253207

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The response of rumen microorganisms to medium-chain fatty acid (Caprylic acid 56.2%, Capric acid 40.8%) calcium salt (M) and long-chain fatty acid (Oleic acid 38.4%, Linoleic acid 35.0%, Linolenic acid 3.3%) calcium salt (L) was determined in vivo using rumen cannulated sheep. Both Ca-salts were supplemented to the daily diet at 5% (w/w) level. Total viable bacteria, five functional subgroups (cellulolytic, xylan-fermenting, pectin-fermenting, starch-fermenting, lipid-utilizing) of bacteria, anaerobic fungi and ciliates were enumerated. In sacco measurement was done using timothy hay and rice straw as substrates. Particle-bound endo-1, 4-.beta.-gluconase (EC activity of nylon-bag residues as also determined. In sacco fiber digestion and the particle-bound endoglucanase activity was reduced by M-supplementation, while L-supplementation had no apparent negative effect of fiber digestion. Bacterial number was not significantly altered. Fiber-digesting subgroup tended to decrease by M-supplementation, however. M-supplementation significantly reduced sizes of fungal and ciliate population and only small entodinia were maintained in M-fed sheep rumen.