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Lisina para frangos de corte de crescimento lento criados em sistema de semiconfinamento / Lysine for broiler chickens reared in slow-growth raised in a free-range system.Nascimento, Eduardo Souza do 19 September 2008 (has links)
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Previous issue date: 2008-09-19 / The experiment aimed to analyse the effects of the level of lysine in the ration on
performance, carcass characteristics and economic indicators of broilers raised in a free-range
system in the periods ranging 35 to 70 and from 35 to 84 days age. The experimental design
was the completely randomised with five tretments and four repetitions of 15 broilers each.
The treatments were constituted of the values of 0.680; 0.840; 1.000; 1.160 and 1.320% of
total of lysine in the ration (0.586; 0.746; 0.906; 1.066 and 1.226% of digestible lysine). In the
period form 35 to 70 days age the levels of lysine influenced the final live weight of the
broilers and it was estimated the level in 1.130% which would afford the best final live weight
(2630g). The level of 1.135% of lysine in the ration would result in a bigger gain of weight
(1641g). The broilers presented a linear growth in the ration consumption and linear reduction
in the efficiency of of lysine utilization with the increase of the lysine levels in the ration. It
was estimated a value of 1.046% of total lysine (0,952% of diestible lysine) which would
result in a best feed: gain ratio (2.98). In the period from 35 to 84 days age the following
values were estimated: 1.189% of total lysine (1.095% of diestible lysine) to bigger live
weight (3211g), 1.196% of total lysine (1.102% of diestible lysine) to bigger gain of weight
(2220g) and 1.078% of total lysine (0.984% of diestible lysine) to best feed: gain ratio
(3,28).The increasing levels of lysine in the ration resulted in a linear increase in the ingestion
of lysine and linear reduction in the efficiency lysine utilization. In relation to the carcass
characteristics of broilers slaughtered at 70 days age, quadractic effects on the live weight
after fasting and on the absolute weight of the hot carcass, abdominal fat, breast,
thigh+drumstick and wing were observed. The studied levels of lysine influenced quadracticly
the yield of breast and back and the relative weight of abdominal fat and gizzard. The levels
of lysine influenced quadracticly the breast and back yield and the relative weight of the
abdominal fat and gizzard. Linear increases in the absolute weight of the back, heart, liver,
cecos and feet and linear reduction in the absolute weight of the proventricle and in the
relative weight of the small intestine were observed. In the period from 35 to 84 days age
quadractic effects on the absolute weight of the hot carcass, carcass yield, breast
thigh+drumstick and back, in the heart and in the small intestine were observed. Linear
increases in the live weight after fasting, in the absolute weight of the wing and liver, in the
breast and thigh+drumstick and a linear reduction in the relative weight of the proventricle
were observed. The levels of lysine did not influenced the other studied parameters. It was
estimated that the ration with the level of 1.160% of total lysine (1.066% of digestible lysine)
determined the biggest rate of the gross margin average by liver weight and of the gross
margin average by weight gain in both studied periods. After 35 days age it is recomended to
the male broilers of slow growing raised in a free-range system ration with 1.135% of total
lysine (1.041% of digestible lysine) and with 1.196% of total lysine (1.102% of digestible
lysine) respectively, to the slaughter at 70 and at 84 days age. / O experimento teve como objetivos avaliar os efeitos do n?vel de lisina na ra??o sobre o
desempenho, caracter?stica de carca?a e indicadores econ?micos de frangos de corte machos
de crescimento lento, criados em semiconfinamento, nos per?odos de 35 a 70 e 35 a 84 dias de
idade. Foi adotado o delineamento inteiramente casualizado com cinco tratamentos e quatro
repeti??es de 15 aves cada. Os tratamentos foram constitu?dos pelos valores de 0,680; 0,840;
1,000; 1,160 e 1,320% de lisina total na ra??o (0,586; 0,746; 0,906; 1,066 e 1,226% de lisina
digest?vel). No per?odo de 35 a 70 dias de idade, os n?veis de lisina influenciaram no peso
vivo final dos frangos sendo estimado o n?vel de 1,130% de lisina total que proporcionaria o
melhor peso vivo (2630g). Para o ganho de peso o n?vel de 1,135% de lisina total na ra??o
resultaria no maior ganho de peso (1641g). Os frangos apresentaram aumento linear no
consumo de ra??o e redu??o linear na efici?ncia de utiliza??o de lisina com o aumento dos
n?veis de lisina na ra??o. Para convers?o alimentar foi estimado em 1,046% lisina total
(0,952% de lisina digest?vel) o valor que proporcionaria a melhor convers?o alimentar (2,98).
No per?odo de 35 a 84 dias de idade foram estimados os seguintes valores de: 1,189% de
lisina total (1,095 de lisina digest?vel) para maior peso vivo (3211g), 1,196% de lisina total
(1,102% de lisina digest?vel) para maior ganho de peso (2220g) e 1,078% de lisina total
(0,984 de lisina digest?vel) para melhor convers?o alimentar (3,28). Os n?veis crescentes de
lisina nas ra??es resultaram em aumento linear na ingest?o de lisina e em redu??o linear na
efici?ncia de utiliza??o de lisina. Quanto ?s caracter?sticas de carca?a de frangos abatidos aos
70 dias de idade, foram observados efeitos quadr?ticos sobre o peso vivo p?s o jejum e nos
pesos absolutos da carca?a quente, da gordura abdominal, do peito, coxa+sobrecoxa e asa. Os
n?veis de lisina pesquisados influenciaram de forma quadr?tica no rendimento do peito e
dorso e nos pesos relativos da gordura abdominal e da moela. Foram observados aumentos
lineares nos pesos absolutos do dorso, cora??o, f?gado, cecos e p?s e redu??es lineares nos
pesos absolutos do proventr?culo e nos pesos relativos do proventr?culo e intestino delgado.
No per?odo de 35 a 84 dias de idade, foram observados efeitos quadr?ticos sobre o peso
absoluto da carca?a quente, rendimento de carca?a, no peito, coxa+sobrecoxa e dorso, no
cora??o e no intestino delgado. Foram observados aumentos lineares no peso vivo p?s-jejum,
nos pesos absolutos da asa e f?gado, nos rendimentos de peito e coxa+sobrecoxa e uma
redu??o linear no peso relativo do proventr?culo. Os n?veis de lisina n?o influenciaram os
demais par?metros estudados. Foi estimado que a ra??o com o n?vel de 1,160% de lisina total
(1,066% de lisina digest?vel) determinou os maiores ?ndices de margem bruta m?dia por vivo
e de margem bruta m?dia por ganho de peso, nos dois per?odos estudados. Para frangos de
corte machos de crescimento lento e criados em semiconfinamento, recomenda-se ? partir dos
35 dias de idade, ra??o com 1,135% de lisina total (1,041% de lisina digest?vel) e com
1,196% de lisina total (1,102% de lisina digest?vel), respectivamente, para o abate aos 70 e
aos 84 dias de idade.
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