An experiment was conducted
to evaluate the effect of early feed restriction on performance characteristics
and serum thyroxin of broiler chickens. The experiment was designed
in a 2 x 2 factorial with 5 replicates of floor pens with 12 male or
female chicks in each. 240 male and/or female day-old chicks were weighted
and randomly allocated to two treatment groups of each sex. Two treatments
involved, control group and restricted group, which were fed a mixture
of 50:50 rice hulls and commercial starter diet with supplementation
of trace minerals and vitamin premixes from 4 to 11 days of age. All
groups were fed the same starter, grower and finisher diets from 11
to 56 days of age. Live body weight of restricted birds was compensated
on day 42 of age and was numerically more than restricted group at 49
and 56 days of age. Daily feed intake up to 42, 49 and 56 days of age
wasn`t affected by treatments. Feed efficiency in the restricted birds
was significantly (p< 0.05) better than of control birds up to 56 days
of age. Among the body composition, only carcass fat content of restricted
birds was significantly (p< 0.05) lower than of control birds. Abdominal
fat pad percent of restricted birds at 49 and 56 days of age was significantly
(p< 0.05) lower than of control birds. T4 concentration on day 11 in
restricted group was significantly (p< 0.05) lower than control group.
Its concentration during accelerated growth period was not significantly
(p>0.05) more than control group.
A. Hassanabadi and H. Nassiri Moghaddam, 2006. Effect of Early Feed Restriction on Performance
Characteristics and Serum Thyroxin of Broiler Chickens . International Journal of Poultry Science, 5: 1156-1159.