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Energia metaboliz?vel para frangos de corte de diferentes potenciais de crescimento criados em sistema de semiconfinamento. / Metabolizable energy for broilers of different growth potentials raised in a free-range system.Massi, Priscila de Andrade 22 June 2007 (has links)
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Previous issue date: 2007-06-22 / They were used three hundred slow-growing broilers from 35 to 70 and 35 to 84 days of age,
and three hundred fast-growing broilers from 28 to 49 days of age to evaluate the effects of
the energy levels on performance, carcass characteristics and economic indicators of broilers
raised in a free-range system.The experimental design was the completely randomised with
five levels of metabolizable energy and four replications of fifteen each. The slow-growing
broilers, from 35 to 75 days age, had linear reduction on feed consumption with the increase
of the metabolizable energy levels. The metabolizable energy levels influenced in a quadract
form the feed:gain ratio, being estimated in 3046 kcal/kg of the diet the level that would result
in the best feed:gain ratio (2,648). From 35 to 84 days of age, the metabolizable energy level
affected in a linear form the feed consumption and the feed:gain ratio that reduced with the
increase of the metabolizable energy level in the broilers diets. About the carcass
characteristics, from 35 to 70 days age were observed quadract effects on the absolute weight
of the hot carcass, the abdominal fat, the gizzard, the small intestine, and the live weight after
fasting and on the relative weight of the gizzard and the feet. They were observed linear
effects on absolute weights of the abdominal fat, the small intestine and on the small intestine
length. From 35 to 84 days of age were observed linear increases in absolute and relative
weight of the abdominal fat. The metabolizable energy levels did not affect the other studied
parameters. From 35 to 70 days of age, the metabolizable energy levels influenced in a
quadract form the cost for gain unit, being the gross margin average reduced in a linear way
with the increase of the metabolizable energy level of the diet. From 35 to 84 days of age the
cost for gain unit increased in a linear form with the increase of the metabolizable energy
levels and the smaller level the metabolizable energy resulted in greater gross margin average.
In relation of the fast-growing broilers was observed that the metabolizable energy levels
affected the feed:gain ratio that improved in a linear form and the feed consumption that
showed a quadract effect. They were observed linear increases in the live weight after fasting,
the absolute weights of the hot carcass, the abdominal fat, the proventricle and the small
intestine and in the relative weights of the abdominal fat and the gizzard. Quadract effects
were observed in the carcass yeld, the absolute weights of the liver and the head with neck
and in the relative weight of the liver. The metabolizable energy levels influence in a quadract
form the cost for gain unit and the greater rate of the gross margin average was obtained with
the level of 2900 kcal of ME/kg. / Foram utilizados 300 frangos de corte de crescimento lento nos per?odos de 35 a 70 e de 35 a
84 dias de idade, e 300 frangos de corte de crescimento r?pido no per?odo de 28 a 49 dias de
idade para avaliar os efeitos dos n?veis de energia metaboliz?vel (EM) sobre o desempenho,
caracter?sticas de carca?a e indicadores econ?micos de frangos semiconfinados. O
delineamento experimental foi o inteiramente casualizado com cinco tratamentos e quatro
repeti??es de quinze aves cada. Os frangos de crescimento lento apresentaram no per?odo de
35 a 70 dias de idade, redu??o linear no consumo de ra??o (CR) com o aumento dos n?veis de
EM. Os n?veis de EM influenciaram de forma quadr?tica a convers?o alimentar (CA), o que
permitiu estimar em 3046 kcal/kg de ra??o o n?vel que proporcionaria a melhor CA (2,648).
No per?odo de 35 a 84 dias de idade, o n?vel de EM afetou de forma linear o CR e a CA que
reduziram com o aumento de EM na ra??o dos frangos de corte. Quanto ?s caracter?sticas de
carca?a, no per?odo de 35 a 70 dias de idade, foram observados efeitos quadr?ticos sobre os
pesos absolutos da carca?a quente, da gordura abdominal, da moela, do intestino delgado e do
peso vivo ap?s o jejum e sobre os pesos relativos da moela e dos p?s. Foram observados
efeitos lineares sobre os pesos relativos da gordura abdominal e do intestino delgado e sobre o
comprimento do intestino delgado. No per?odo de 35 a 84 dias de idade, foram observados
aumentos lineares nos pesos absolutos e relativos da gordura abdominal. Os n?veis de EM n?o
influenciaram os demais par?metros estudados. No per?odo de 35 a 70 dias, os n?veis de
energia metaboliz?vel influenciaram de forma quadr?tica o custo por unidade de ganho
(CPUG), tendo a margem bruta m?dia (MBM) reduzido linearmente com o aumento do n?vel
de energia metaboliz?vel da ra??o. No per?odo de 35 a 84 dias de idade o CPUG aumentaram
de forma linear com o aumento dos n?veis de energia metaboliz?vel e o menor n?vel de EM
resultou em maior ?ndice de MBM. Quanto aos frangos de crescimento r?pido, observou-se
que os n?veis de EM afetaram a CA que melhorou de forma linear e o CR que apresentou
efeito quadr?tico. Foram observados aumentos lineares no peso vivo ap?s jejum, nos pesos
absolutos da carca?a quente, da gordura abdominal, do proventr?culo e do intestino delgado, e
nos pesos relativos da gordura abdominal e da moela. Efeitos quadr?ticos foram observados
no rendimento de carca?a e nos pesos absolutos do f?gado e da cabe?a com pesco?o e no peso
relativo do f?gado. Os n?veis de energia metaboliz?vel influenciaram de forma quadr?tica o
CPUG e o maior ?ndice de MBM foi obtido com o n?vel de 2900 kcal/kg.
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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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