SHORT COMMUNICATION
Effects of different proportions of dietary structural
and nonstructural carbohydrates on ruminal
fermentation and microbial growth efficiency in
sheep
1
China Green Food Development Center,
Beijing 100081, P.R. China
2
State Key Laboratory of Animal Nutrition, College of Animal Sciences and Technology,
China Agricultural University,
Beijing 100094, P.R. China
Publication date: 2007-09-17
Corresponding author
Q. X. Meng
State Key Laboratory of Animal Nutrition, College of Animal Sciences and Technology, China Agricultural University, Beijing 100094, P.R. China
State Key Laboratory of Animal Nutrition, College of Animal Sciences and Technology, China Agricultural University, Beijing 100094, P.R. China
J. Anim. Feed Sci. 2007;16(Suppl. 2):218-223
KEYWORDS
ABSTRACT
Four sheep were used in a 4×4 Latin square design to study the effect of different dietary
proportions of structural carbohydrate (SC) and nonstructural carbohydrate (NSC) (SC:NSC ratio:
0.55, 1.12, 2.25 and 5.24) on rumen fermentation and microbial growth efficiency. As the dietary
SC: NSC ratio increased, ruminal pH and ammonia concentration increased (P<0.001), but total
rumen VFA concentration decreased (P<0.001). When dietary SC:NSC ratio increased from 0.55 to
1.12, the molar percentage of acetate increased (P<0.001) and the molar proportion of propionate
decreased (P<0.001). However, when the ratio increased from 1.12 to 5.24, there were no changed
molar percentages of acetate and of propionate. Both daily microbial nitrogen production and
microbial efficiency decreased with increasing dietary SC:NSC ratio.
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| ISSN: | 1230-1388 |
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