| Summary: | This study was purposed to determine the black tea waste extract effect
as a source of antioxidants, the level of energy - protein rations as well as the
interaction between them to oxidation stability and meat quality of broilers. The
experiment used an analysis of variance factorial pattern 3 x 3 (3-level factors
providing feed additives and 3 types of rations) and if there were significant
differences, continued with Duncan Multiple Range Test (DMRT). Ration types
namely Type 1: low energy � protein (CP 18,03% and ME 2769,41 kcal/kg), Type
2: medium energy � protein (CP 20,03% and ME 3013,54 kcal/kg), Type 3: high
energy � protein (CP 22,09% and ME 3351,62 kcal/kg). Each ration treatment
was given four levels of additives providing: black tea waste extract 0 mg/kg of
feed, 500 mg/kg of feed and 1000 mg/kg of feed. The experiments were
conducted for 42 days using 45 chickens, each treatment consisted of 5 chickens
as a replication. The variables measured include performance, carcass
parameter, chemical composition of meat, physical quality of meat, the levels of
malondialdehyde (MDA), cholesterol and fatty acid composition of meat. The
experiment results showed that supplying black tea waste extract and energy �
protein level significantly affected average daily gain, pH, cooking loss, MDA
levels, saturated fatty acid (SFA), mono unsaturated fatty acid (MUFA) and poly
unsaturated fatty acid (PUFA) of the meat (P<0,05). Supplying the black tea
waste extract did not significantly affect performances, carcass production and
chemical quality of the meat. It decreased meat pH significantly (P<0.05), levels
of MDA and total of meat SFA (P<0,05). Black tea waste extract supply increased
the total of MUFA and PUFA (P<0,05). Energy - protein level of ration did not
make differences of chemical quality of meat, increased performances, carcass
production, the water-holding capacity of meat, meat MDA levels, meat
cholesterol, the total of MUFA and PUFA (P<0,05), however decreased meat
SFA total (P<0,05). The results showed that the addition of black tea waste
extracts as a feed additive has a good effect on the oxidation stability that is
reflected in decreased levels of MDA and SFA total of meat and increased PUFA
total in meat, without causing differences in meat quality. Level 500 mg/kg feed of
tea waste extract combine with medium energy � protein feed level indicates the
best result in performance, meat quality and oxidative stability.
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