Four, rumen fistulated cattle
were randomly assigned according to a 4 x 4 Latin square design. The
experiment was to study effects of crude saponins and condensed tannins
in mangosteen peel on rumen microorganisms and fermentation, microbial
protein synthesis and nutrient digestibility in cattle. The dietary
treatments were as follows: T1 = Control (without Mangosteen peel supplementation,
MSP); T2 = 50 g DM of MSP/hd/d; T3 = 100 g DM of MSP/hd/d; T4 = 150
g DM of MSP/hd/d with urea-treated rice straw (UTS) fed ad libitum.
Roughage dry matter intakes in terms of kg/d and %BW were slightly higher
in 100 gDM/hd/d supplemented cattle. Apparent digestibilities (%) of
DM, OM, CP, NDF and ADF were similar among treatments. The values of
ruminal temperature, pH, NH 3-N and BUN were not significantly
affected by MSP supplementation. However, MSP supplementation increased
bacterial population, and was highest at 150 gDM /hd /d supplementation.
The protozoal population was significantly decreased while fungal zoospore
populations were not changed, and were highest at the 100 gDM/hd/d supplementation
group. However, lower values of TVFAs and C2/C3, and higher proportions
of C3 were found at 100 gDM/hd/d of MSP supplemented than in the control
group. In addition, microbial nitrogen supply, efficiency of rumen microbial
protein synthesis and P /E ratio tended to be higher in MSP supplemented
groups and were highest at 100 gDM /hd /d MSP supplementation. These
results suggest that MSP supplementation at 100-150 gDM/hd/d could be
used as a dietary source to manipulate rumen ecology thus improving
rumen fermentation and potential productivity in cattle.
A. Ngamsaeng , M. Wanapat and S. Khampa , 2006. Effects of Mangosteen Peel (Garcinia mangostana)
Supplementation on Rumen Ecology, Microbial Protein Synthesis, Digestibility
and Voluntary Feed Intake in Cattle . Pakistan Journal of Nutrition, 5: 445-452.