Níveis de valina digestível nas dietas pré-inicial e inicial com redução dos níveis de proteína bruta para frangos
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2014-08-29
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Universidade Federal de Goiás
Resumo
Two experiments were conducted to evaluate the supplementation of digestible
valine in the diet for the pre-starter and starter phases of rearing chickens. The
variables evaluated were performance, metabolization of nutrients,
development of digestive organs and lymphoid organs, and lymphocyte count of
lymphoid organs of broilers from breeders of two ages. In Experiment I and II
the supplemental digestible valine for broilers were evaluated in the pre -start
and early stage at each stage using 400 day-old chicks old commercial Cobb,
were obtained from arrays of 37 and 52 weeks of age, respectively, housed in
experimental batteries until 21 days of age, fed different levels of digestible
valine 0.92%, 1.02%, 1.12%, 1.22% and 0.83%, 0.93 %, 1.03% and 1.13% in
the pre-starter and starter ration, respectively. The experimental design in both
experiments was a completely randomized factorial 2 x 4 (ages matrices x
levels of valine) totaling eight treatments with 5 replicates (10 birds per
replicate). Data were subjected to analysis of variance and levels of digestible
valine polynomial regression was applied. In the pre-starter phase, birds from
arrays of 52 weeks showed greater weight of arrival compared the birds from
arrays of 37 weeks. In the initial phase, effect of dietary valine for feed intake,
which decreased the amount of feed consumed with inclusion of 1.03%
digestible valine was observed. For the data of metabolism of nutrients, four to
seven days of age of the bird, negative quadratic effect was seen when
evaluating the levels of amino acid in the pre-starter diet as the nitrogen
balance, coefficient of metabolism of nitrogen and retained nitrogen with point
maximum of 1,156; 1.114 and 1.172% digestible valine in the diet, respectively.
Breeder age significantly influenced the coefficient of nitrogen metabolism with
higher values for chicks from arrays of 37 weeks. In the analysis of the
morphology of the duodenum, jejunum and ileum, the effect of age in isolation
matrix was observed for villus height and villus: crypt in the duodenum with
higher values for birds from arrays of 52 weeks to seven days old. By analyzing
the different levels of digestible valine positive linear effect was observed in
villus height and villus: crypt ratio and negative linear effect on crypt depth in the
duodenum to seven days old. The age of the matrix effect on weight of total gut
of chickens after seven and 21 days old, with higher values for arrays chicks
from 52 week-old. Likewise, the higher age of the matrix positively influenced in
the production of lymphocytes in the thymus at seven days old and the bursa at
21 days of age. There was interaction between breeder age and levels of
digestible valine analyzed for spleen at seven days of age. When using the
recommendations of the Brazilian Tables, which is 1.02% digestible valine to
the pre-starter phase, the spleen showed lower lymphocyte production for
younger mothers. But was verified by regression analysis of data, which when
increased levels of digestible valine inclusion in the pre -starter diet, there is a
positive linear improvement in the production of lymphocytes.
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SILVA, Guilherme Xavier da. Níveis de valina digestível nas dietas pré-inicial e inicial com redução dos níveis de proteína bruta para frangos. 2014. 66 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2014.