期刊
ANIMAL FEED SCIENCE AND TECHNOLOGY
卷 83, 期 2, 页码 165-170出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0377-8401(99)00126-1
关键词
yeast culture; Saccharomyces cerevisiae; monensin; rumen fermentation; digestion
A metabolism trial was conducted to evaluate the effects of supplying a yeast culture containing Saccharomyces cerevisiae (Levucell) and monensin to sheep, on ruminal fermentation and digestibility of diets. Four Suffolk sheep (30 kg BW) with ruminal cannula were used in a Latin Square design, where treatments were control (C), 1 g/day of Levucell (L, 20 x 10(9) CFU/g), 25 mg/day of monensin (M) and a combination of L and M. Additives were dosed directly into the rumen, The diet was based on alfalfa hay (50%) and a concentrate containing sorghum grain (60%), molasses (24%), urea (2%) and soybean meal (14%). Digestibility of dry matter, neutral detergent fiber, and dry-matter intake were not affected (p > 0.05) by treatments. The ionophore alone or in combination, reduced (p < 0.05) the molar proportion of acetate from approximate to 71.2 to 66.2, and increased propionate from approximate to 18.6 to 24.4 without any effect on butyrate. Ruminal protozoa counts (organisms x 10(4)) were greater (p < 0.05) in the control group (69.4) than with feed additives (15.9-39.7). No effects were detected in ruminal pH. Monensin and M + L increased propionate proportion, but no effects was observed with S. cerevisiae alone. (C) 2000 Elsevier Science B.V. All rights reserved.
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