Níveis de triptofano digestível nas fases pré-inicial e inicial em frangos machos e fêmeas
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2014-07-25
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Universidade Federal de Goiás
Resumo
We aimed to evaluate digestible tryptophan level in males and females
broilers on pre-initial (one to seven days old) and initial phase (eight to 21 days old)
diets. Four experiments were conducted, one with males on pre-initial phase, one
with males on initial phase, another with females on pre-initial and one with
females on initial phase. The design was completely randomized with four
treatments, five replicates with ten animals each, where each repetition consists an
experimental unit. In the experiment, tryptophan requirement was determined using
diets with different digestible tryptophan levels. A deficient tryptophan diet was
formulated, considered the basal diet, which was supplemented with L -tryptophan
replacing inert material in order to achieve digestible tryptophan desirable levels.
The treatments of experiment 1 consisted of: T1 - 0.209% digestible tryptophan
diet (basal diet); T2 - 0.223% digestible tryptophan diet; T3 - 0.235% digestible
tryptophan diet; T4 - 0.248% digestible tryptophan diet for male broilers in preinitial phase; Treatments for experiment 2 were: T1 - 0.187% digestible tryptophan
diet (basal diet); T2 - 0.200% digestible tryptophan diet; T3 - 0.211% digestible
tryptophan diet; T4 - 0.223% digestible tryptophan diet for male broilers on initial
phase; Treatments for experiment 3 are: T1 - 0.212% digestible tryptophan diet
(basal diet); T2 - 0.225% digestible tryptophan diet; T3 - 0.238% digestible
tryptophan diet; T4 - 0.252% digestible tryptophan diet for female chickens cut i n
pre-starter; Treatments for experiment 4 are: T1 - diets with 0.186% digestible
tryptophan (basal diet); T2 - diet with 0.198% digestible tryptophan; T3 - diet with
0.209% digestible tryptophan; T4 - diet with 0.221% digestible tryptophan for
female broiler chickens on initial phase. Diets were formulated with corn, soybean
meal, poultry gut meal and bone meal, supplemented with industrial amino acid LLysine, DL-methionine, L-threonine, L-arginine, L-valine, and L-tryptophan. Feed
intake, weight gain, feed conversion, as well as nutrients digestibility evaluation
was performed. Performance and diet nutrients metabolism data were subjected to
variance analysis (ANOVA). Digestible tryptophan levels estimates were made by
linear models and quadratic regression at 5% probability. SAS 9.2 was used. After
analyzing obtained data, it was found that; amino acid supplementation did not
affect broilers of neither sex performance. Digestible tryptophan levels for male
broilers on pre-initial phase of 0.209% and on initial phase of 0.187%, and
digestible tryptophan levels for female broilers in pre-initial of 0,212% and on initial
phase of 0,186% is recommended.
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BORGES, Bruno Samuel. Níveis de triptofano digestível nas fases pré-inicial e inicial em frangos machos e fêmeas. 2014. 47 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2014.