Relações de aminoácidos sulfurados: lisina digestíveis e diferentes fontes de betaína nas dietas pré-inicial e inicial de frangos
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2015-05-07
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Universidade Federal de Goiás
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Researches with the use of betaine in broiler diets have shown its role inintestinal
osmoregulator under stress, increasing cell water retention and its role as a methyl group
donor in metabolic processes.The use of additives as betaine is a good economical alternative
to feed chickens. The objective of this study was to evaluate growing relations of sulfur amino
acids: lysine in combination with two sources of betaine in broiler diet in pre-starter and
starter phases.The experiment was conducted at experimental poultry of School Veterinary
and Animal Science of Federal University of Goiás in Goiânia, The experimental protocol
was approved by the Ethics Committee on Animal Use / CEUA registered under protocol.
068/13. 504 chicks Cobb 500® males with a day old were housed, in galvanized steel
batteries with five floors, troughs and linear feeders Division and incandescent lamps for
heating.The experimental designused was randomized block in a 3x4 factorial design,
corresponding to diets containing betaine (synthetic and natural) compared to the control with
out use of the compound, and different relations of methionine+cystine: digestible lysine
(57%, 65%, 73% and 81%), with 12 treatments, 6 replicates of 7 birds.The experimental diets
of corn and soybean meal, free from growth promoters and anticoccidial, were formulated
with the exception of methionine and cystine levels in the appropriate treatments, and the DLmethionine
added to replace the starch. Performance was measured with the weighing of birds
and diets on the accommodation and 7, 14 and 21 days of age, determining the average final
weight, weight gain, feed intake and feed conversion, For the blood biochemical profile,
blood was collected for determination of serum Na+, K+, Cl-, albumin, globulin,
albumin:globulin, protein, cholesterol, triglycerides, HDL, VLDL, LDL and uric acid.
Formetabolizability of nutrients was used the total excreta collection 4-7 days and 17-21 days
of age, determining the coefficients of raw dry, nitrogen and nitrogen retained and nitrogen
balance. Necropsies were done on chicks with 7 and 21 days of age, during which time
samples were collected from the small intestine (duodenum, jejunum and ileum) for mounting
histological slides and weighing the organs of the gastrointestinal tract (GIT). For
histomorphometry, was checked villus height, crypt depth and villous:crypt duodenum,
jejunum and ileum. Data were subjected to analysis of variance (P <0,10) and applied to
polynomial regression analysis for methionine+ cystine: lysine. Al though there was no
expressive difference in the use of betaine sources, you can check the sparing effect of
methionine, as the birds fed the lower methionine+ cystine: lysine showed higher weights
when supplemented with betaine, in particular the source of natural betaine. There was a
positive interaction of betaine on the Met+Cys relations: Lys digestible for blood
biochemistry profile, villus height and metabolization of nutrients.
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REZENDE, P. M. Relações de aminoácidos sulfurados: lisina digestíveis e diferentes fontes de betaína nas dietas pré-inicial e inicial de frangos. 2015. 60 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2015.