The present work, divided in two experiments, was carried out in the poultry sector of
the Federal University of Tocantins, Araguaína Campus with the objective of
evaluating determine the coefficients of apparent metabolizability of dry matter
(CAMDM), crude protein (CAMCP), crude energy (CAMCE), the apparent
metabolizable energy (AME) and the corrected apparent nitrogen metabolizable
energy (AMEn) of rice, whole rice bran and rice broken and inclusion of whole rice
bran levels in diets for slow - growing chickens. In the experiment I were used poultry
with 21 days of age, Neck Red Pelado. The design was completely randomized, with
four treatments and five replicates of ten birds. The treatments consisted of a
reference diet and three diets tests, in which rice, rice bran and rice broken replaced
30% of the reference diet.. In the experiment II were used 300 one-day-old chicks,
Neck Red Pelado. The design was completely randomized experimental design, with
five treatments (0, 5, 15, 20 and 25% whole rice bran inclusion), six replicates and
ten poultrys per replicate. Were evaluated the performance in the periods from 1 to
30, 1 to 60 and 1 to 90, carcass and noble cuts yield, organ biometry and colorimetry
of the skin and breast meat of chickens slaughtered at 90 days were evaluated. In
the experiment I, it was observed for rice, values of AME, AMEn of 3870, 3740 kcal
kg-1 and 96.2%, 76.3%, 96.9%, for CAMDM, CAMCP, CAMCE, respectively. The
rice broken presented values of AME, AMEn and CAMDM, CAMCP and CAMCE,
from 3460, 3410 kcal kg-1
and 94.6%, 36.4% and 93.2%, respectively. The rice bran
obtained the following results: 68.1%, 32.4%, 71.9% for CAMDM, CAMCP, CAMCE,
3300 and 3280 kcal kg-1
, for AME and AMEn, respectively. In the experiment II, the
inclusion of whole rice bran levels did not influence (p> 0.05) feed intake, weight
gain, feed conversion ratio and final weight at 30, 60 and 90 days, carcass yields and
noble cuts, the relative weights of gizzard, liver, heart, abdominal fat, small intestine,
spleen and bursa. However, there was an increasing linear effect (p <0.05) for weight
and length of the large intestine. For the variables of skin and meat colorimetry, the
inclusion of rice bran promoted a linear reduction (p <0.05) in the color parameters (b
*) of the skin and meat, besides providing a linear increase (p <0.05) in the values of
Luminosity (L *) of the meat. For the other variables, no significant effect was
observed (p> 0.05). It is recommended to use up to 25% of rice bran in rations for
slow-growing chickens.
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