Digestible threonine levels in the starter diet of broilers derived from breeders of different ages
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2015-12
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Resumo
The aim of this study was to evaluate the effect of digestible
threonine supplementation in the starter diet on the performance,
intestinal parameters, and nutrient metabolism of broilers derived
from breeders of different ages. In total, 480 one-day-old Cobb chicks,
derived from 38-or 49-week-oldbreeders, were housed in experimental
battery cages until 21 days of age and fed four different threonine levels
(800, 900, 1,000, or 1,100 mg/kg) in the starter feed. A completely
randomized experimental design in a 2x4 factorial arrangement
(breeder age x threonine levels) was applied, totaling eight treatments
with five replicates of 12 birds each. Broilers from older breeders fed
800 mg digestible threonine/kg of diet presented higher weight gain,
with a positive linear effect. There was also an interaction between
breeder age and threonine levels for the weight gain of 21-d-old broilers
supplemented at maximum level of 1,003 mg Thr/kg diet during the
starter phase. There was no effect of breeder age or threonine levels
on nutrient metabolism during the period of 17-21 days. There was
no influence of breeder age or threonine levels in the starter diet on
intestinal morphometric measurements, absorption area, or percentage
of goblet cells.
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Development, Metabolism, Nutrition, Poultry
Citação
TANURE, C. B. G. S.; SANTOS, J. S.; OLIVEIRA, E. M.; LABOISSERE, M.; RACANICCI, A. M. C.; MCMANUS, C.; CAFÉ, M. B.; STRINGHINI, J. H. Digestible threonine levels in the starter diet of broilers derived from breeders of different ages. Brazilian Journal of Poultry Science, Campinas, v. 17, n. esp., p. 31-37, Oct./Dec. 2015.