Desempenho e composição corporal de frangos de corte alimentados com diferentes níveis de proteína e de aminoácidos ou com livre escolha das dietas

Kolling, Ana Valeria; Kessler, Alexandre de Mello; Ribeiro, Andréa Machado Leal

doi:10.1590/s1516-35982005000100013

Cited by 15 publications

(18 citation statements)

References 10 publications

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“…During this period, birds consumed more feed when fed Low and Regular AA concentrations (p < 0.05) were fed, probably in an attempt to supply AA deficiencies. Broiler chickens offered free choice between two diets with different CP and AA levels presented similar performance as the control group (22% CP), by choosing diets with less protein, but rich in essential AA (Kolling et al, 2005). These results indicate that the birds regulated their feed intake according to their protein requirements.…”

Section: Effect Of Different Dietary Concentrations Of Amino Acids Onmentioning

confidence: 67%

“…The Mixed NP is an intermeditate program that prevents excessive dietary AA supply during the finishing phase, when broilers become less efficient and excessive nitrogen may have a negative effect (Kolling et al, 2005). The deamination of AA excess increases nitrogen excretion (Faria Filho et al, 2007) and the carbon chain is stored as fat (Leeson et al, 1996), which is unhealthy for human nutrition (Appel et al, 2005).…”

Section: Effect Of Different Dietary Concentrations Of Amino Acids Onmentioning

confidence: 99%

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Effect of different dietary concentrations of Amino Acids on the performance of two different Broiler Strains

Ebling

Ribeiro

Trevizan

et al. 2013

Rev. Bras. Cienc. Avic.

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Four Nutritional Programs (NP) used in the Brazilian poultry industry were tested in two broiler strains (Cobb 500 and Ross 308). NP varied in the concentrations of their main essential amino acids (AA) and were classified as Low, Regular, High and Mixed (high AA concentrations up to 21 days and regular concentrations after that). Minimum digestible Met+Cys/Lys, Thr/Lys, Arg/Lys, Ile/Lys, and Val/Lys ratios were 0.74, 0.64, 1.05, 0.65 and 0.75, respectively, in all NP, and no minimum amount of CP was fixed. There were no interactions between strain and NP for any of the evaluated responses. From 1 to 47 days of age, birds fed the Low NP presented lower average body weight and body weight gain (BWG). The high NP allowed for better feed conversion ratio (FCR), followed by the Regular and the Mixed NP. Ross 308 broilers were heavier, presenting worse FCR due to higher FI. Birds fed the High NP had lower carcass yield than those fed the Low NP. The Low and Regular NP had lower costs per WG when compared with the High NP. Low and Regular NP presented higher gross margin returns compared with the High NP. The Regular and Mixed NP are the most recommended, presenting intermediate performance and higher economic returns.

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Section: Effect Of Different Dietary Concentrations Of Amino Acids Onmentioning

confidence: 67%

Section: Effect Of Different Dietary Concentrations Of Amino Acids Onmentioning

confidence: 99%

Effect of different dietary concentrations of Amino Acids on the performance of two different Broiler Strains

Ebling

Ribeiro

Trevizan

et al. 2013

Rev. Bras. Cienc. Avic.

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“…Para isso, é necessário conhecer o valor energético dos alimentos. Kolling et al (2005) relataram que o fornecimento de dietas altamente energéticas resulta em carcaças mais gordas, enquanto dietas com alto teor de proteína resultam em carcaças mais magras. Dietas com relações calórico-protéicas mais amplas (menos proteína) promovem maior consumo de energia ou baixa ingestão de proteína.…”

Section: Introductionunclassified

Coeficientes de metabolizabilidade da energia bruta de diferentes ingredientes para frangos de corte

Nunes¹,

Rostagno²,

Gomes³

et al. 2008

R. Bras. Zootec.

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RESUMO -Com o objetivo de determinar os valores de energia metabolizável aparente (EMA), aparente corrigida (EMA n ), verdadeira (EMV) e verdadeira corrigida (EMV n ) de oito ingredientes e seus respectivos coeficientes de metabolizabilidade, foram utilizados 300 frangos de corte machos Ross, com 21 dias de idade, distribuídos em oito tratamentos (alimentos) e uma ração-referência, em três blocos com duas repetições por bloco e cinco aves por unidade experimental. Os alimentos avaliados foram: duas amostras de grão de trigo (TI), duas de farelo de trigo (FT), duas de grão de milho (MI), uma de grão de sorgo (SO) e uma de farelo de glúten de milho 21% (21% FGM), as quais substituíram 30% da ração-referência. Coefficient of metabolizability of gross energy of different ingredients for broiler chickensABSTRACT -With the objective of determine the apparent metabolizable energy (AME), corrected apparent (AME n ), true metabolizable energy (TME) and corrected true (TME n ) values of eight feedstuffs and their respective coefficient of metabolizability, 300 male broiler chickens, Ross, averaging 21 days old, were assigned to eight treatment (feeds) and one reference diet, in three blocks with two replications per block and five birds per experimental unit. The feedstuffs studied were:two sample of wheat grain (WG), two wheat bran (WB), two corn grain (CG), one of sorghum grain (SG) and one of corn gluten feed 21% (21% CGF), which replaced 30% of the reference diet. The birds were ad libitum fed per 12 days, where the last five days were used for the excreta collection. During the five days of collection, 30 birds allotted to six cages were fasted for 72 hours (the initial 24 hours for the emptying of the gastrointestinal tract) and the remaining 48 hours, for excreta collection, which was quantified and extrapolated for five days. The AME and AME n in kcal/kg DM, were in average of 3.391 and 3.275for WG, of 2.076 and 1.996 for WB, of 3.862 and 3.768 for CG, of 3.551 and 3.464 for SG and of 1.992 and 1.901 for 21%CGF. To TME and TME n in kcal/kg DM, were in average of 3.495 and 3.496 for WG, of 2.195 and 2.146 for WB, of 3.981 and 4.040 for CG, of 3.652 and 3.680 for SG and of 2.117 and 1.961 for 21% CGF. The coefficient of metabolizability for gross energy were in average of 68,94%.Key Words: apparent metabolizable energy, coefficient of metabolizability, true metabolizable energy IntroduçãoA avicultura é uma atividade dinâmica que fornece proteínas de origem animal de alta qualidade para consumo humano. Atualmente, o Brasil se mantém em ótima posição no ranking mundial de produção avícola, conquistada com a adoção de tecnologias modernas ao longo das últimas décadas.

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“…These results are different from the findings of Zuowei et al (2011), who showed that females housed at high density had poorer FCR and lower BW at 42 d of age. The lower BW of females (Kolling et al 2005) compared with males may explain why, in the case of females, increasing bird density and maintaining the same nutritional density did not affect performance.…”

Section: Resultsmentioning

confidence: 99%

Comparison between linear and nonlinear systems of feed formulation for broilers

Dadalt

Butzen

Ribeiro

et al. 2015

Rev. Bras. Cienc. Avic.

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Two experiments were simultaneously carried out to compare feed formulation models: a linear model for minimum cost with a nonlinear model for maximum profitability for one-to 42-d-old broilers. One-dold male or female Cobb 500 broilers (n=2368) were allocated to one of the two trials according to sex. The experiments were performed simultaneously in an experimental poultry farm. Two housing densities were used: high density (HDH), with 14 birds/m 2 , and low density (LDH), with 10 birds/m 2 . The following treatments were evaluated: linear feed formulation and LDH (LF10); nonlinear formulation and LDH (NF10); linear formulation and HDH (LF14); and nonlinear formulation and HDH (NF14). A completely randomized design with four treatments of eight replicates each was applied. Performance and cost per kg of poultry were evaluated. Both formulation systems promoted similar broiler performance. However, the high-density feed using linear formulation reduced body weight in 42-d-old males, but not when nonlinear formulation was used. The NF10 treatment yielded the worst feed conversion ratio (p<0.05) and the lowest cost/kg broiler (p<0.05) for both sexes. The results demonstrate that the nutritional program that yields the best performance is not always the most economical one.

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Desempenho e composição corporal de frangos de corte alimentados com diferentes níveis de proteína e de aminoácidos ou com livre escolha das dietas

Cited by 15 publications

References 10 publications

Effect of different dietary concentrations of Amino Acids on the performance of two different Broiler Strains

Effect of different dietary concentrations of Amino Acids on the performance of two different Broiler Strains

Coeficientes de metabolizabilidade da energia bruta de diferentes ingredientes para frangos de corte

Comparison between linear and nonlinear systems of feed formulation for broilers

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