Níveis e fontes de metionina na nutrição de frangos de corte
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2017-03-20
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Universidade Federal de Goiás
Resumo
Methionine is an essential amino acid and the first limiting factor in broiler feed.
Knowing the bioefficacy of methionine sources and the nutritional requirements of
methionine + cystine, as well as their effects on broilers in the different stages and
conditions of breeding, is necessary. The objective of this study was to determine the
relative bioefficacy of the dietary source of methionine hydroxy analogue calcium salt
(MHA-Ca), compared to DL-methionine (DL-met) and methionine + cystine
requirement (M + C). Its effect on blood parameters and bed quality in the initial and
growth stages of broiler chickens. For this, two experiments (I and II), in the 1 to 21
days and 22 to 42 days of age phases, were performed using a total of 3528 male, oneday-old
broilers of the lineage (Cobb-500). In the experiment I, 1728 birds distributed in
9 treatments - (basal diet - without methionine, and four levels of methionine (6
replicates / 32 birds) were used in order to determine the bioefficacy of MHA-Ca
compared to DL-Met In the experiment II, in order to determine the Met + Cis
requirement, as well as its effect on blood parameters and bed quality, 1800 birds were
used in 5 treatments (6 replicates / 30 birds), of which 900 (MHA-Ca, DL-Met) and
(DL-Met), respectively, were used in experiments I and II, respectively, in the initial
phase and the rest in the growth phase. The mean bioavailability for MHA-Ca for
weight gain and feed conversion was 65% and 22% in the 1 to 21 days phase, and 41%
and 58% in the 22 to 42 days phase. Of digestible M + C requirement, estimated for the
1 to 21 and 22 to 42 days of age, was 0.764 and 0.716% corresponding to a Met + Cys /
lysine ratio of 64% and 68%, respectively. The levels of Met + Cys influenced in some
blood parameters (hemoglobin, heterophilic ratio: lymphocytes and monocytes, total
leukocytes, hemocytes and hematocrits, uric acid, albumin, PST, total LDL cholesterol
and TG) and bed quality And excreted nitrogen) of broiler chickens.
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CARVALHO, G. B. Níveis e fontes de metionina na nutrição de frangos de corte. 2017. 126 f. Tese (Doutorado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2017.