Animal, diets and experimental design:
Four- fistulated male crossbred beef cattle
(228±45 kg of BW) were randomly assigned
according to a 4x4 Latin square design to
investigate the effect of mangosteen peel and
garlic powder supplementation on FI, digestibility
of nutrients, rumen fermentation and methane
production. The dietary treatments were as fallows:
T1 = control (non-supplementation), T2 = supplementation
of mangosteen peel pellet (Mago-pel)
200g/day, T3 = supplementation of mangosteen
peel with garlic powder pellet (Maga-lic) 200g/day
and T4 = supplementation of mangosteen peel
pellet with urea and garlic powder (Maga-ulic)
200g/day. The ration compositions were shown in
Table 1. All animals were kept in individual pens
and received free access to water and mineral
blocks. The animals received concentrate diet
at 0.5 % of BW and while rice straw was offered
ad libitum as basal roughages source. FI of
concentrate and roughage were measured
separately and refusals were recorded. The
experiment lasted for four periods, each period
lasted for 21 days. During the first 14 days FI
was measured, while the last 7 days feed, feces
and feed refusals were sampled for chemical
analyses. Feed and fecal were collected by total
collection when animals were on metabolism
crates during the last 7 days of each period.
Dietary treatment, concentrate, rice straw and
feces were sampled and analyzed chemical
compositions of DM, Ash, CP and NH3-N by the
method of AOAC (1990) and NDF, ADF by Van
Soest et al. (1991).