DESEMPENHO, CARCAÇA E CORTES DE FRANGOS CAIPIRA FRANCÊS BARRÉ (GRIS BARRÉ COU PLUMÉ)
2011
This study aimed to analyze the effects of
metabolizable energy levels and the age at
slaughter on growth performance, carcass yield
and cuts broilers Caipira French Barre. The
experiment was conducted in Parauapebas,
PA. We used 192 one day chicks reared in intensive
system. The experimental design was completely
randomized with three treatments. Each treatment
consisted of four replications, the experimental
unit being a box of 16 birds. The treatments were
defined according to the levels of metabolizable
energy diets (1 to 28 days) and late (29 to 90 days),
respectively: T1 - 3000 and 3100 kcal of ME/kg, T2
- 3100 and 3200 kcal/kg, T3 - 3200 and 3300 kcal
of ME/kg. The variables studied were initial weight,
final weight, feed intake and feed conversion,
protein consumed, metabolized protein consumed,
energy efficiency and protein efficiency. The
characteristics of carcasses of birds, analyzed
with 77, 84 and 91 days of age were the carcass,
breast, thigh, drumstick, wing, back, wings, feet,
head and neck. The statistical analysis was performed
using the ANOVA procedure for a completely
randomized model with the System for statistical
analysis and genetics (SAEG, 2007). Differences
between means of variables were performed
by Tukey's test at a level of 5%. The energy levels
in the diets did not affect on the performance and
carcass yield, breast, thighs, drumsticks, wings,
feet and head + neck in birds. The level of 3200
kcal/kg provided better yield back. The protein and
metabolic energy consumed by the birds improved
with higher energy content of feed during the
fattening stage. Age at slaughter did not affect
carcass yield, however the birds slaughtered at
90 days of age showed higher breast yield.
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