Responses of Cobb × Cobb 500 broilers to dietary amino acid density regimens

Corzo, A.; Schilling, M. Wes; Loar, R. E.; Mejía, Luis Fernando; Barbosa, Luis Carlos Garibaldi Simon; Kidd, M. T.

doi:10.3382/japr.2010-00172

Cited by 38 publications

(24 citation statements)

References 11 publications

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“…Feeding lower protein levels in the finisher phases reduced the feed efficiency. This is in partial agreement with the results of Corzo et al (2010), who reported improved body weight gain when broilers fed on high protein (23, 21 and 20%) diets throughout the life but best FCR was observed in broilers fed on low CP diets (20,21 and 20%,in PS,S and F,respectively) in early phase and high CP during finisher phase. In contrast Abbasi et al (2014) reported that the dietary CP level can be reduced up to 10 %( 18.89 vs17 %) without any adverse effect on growth performance during finisher phase (25-42 d age).…”

Section: )supporting

confidence: 82%

Effect of different levels of dietary crude protein on the growth performance and carcass characteristics of commercial broilers at different phases of growth

Srilatha

Reddy

Preetam

et al. 2017

IJAR

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An experiment was conducted to find out the effect of different levels of crude protein in broiler diets during different phases. i.e., pre starter (0-11d), starter (12-21d) and finisher (22-42d). 360 day-old broilers (Vencobb) were procured from a commercial hatchery and fed either high or low dietary CP diets during pre-starter (23 and 21%) , starter (21 and 19%) and high, moderate or low CP diets during finisher ( 18.5, 17.5 and 16.5%) phases, for a total of 12 possible treatment combinations at d 42. The results showed that the broilers fed low levels of CP ( 21 and 19 %) had significantly(P<0.05) higher body weight gain (BWG) and feed intake (FI), and better feed efficiency over the diets with high levels of CP during pre-starter and starter phases (23 and 21%, respectively). The higher (18.5%) level of protein in the finisher phase showed higher BWG and best FCR compared to the lower levels (17.5 and 16.5%). Carcass characters were not influenced by the variation in dietary CP level tested except the abdominal fat weight which was significantly higher in broiler fed low CP diet compared to those fed higher levels of CP during all three phases. The results indicated that the broilers fed low CP diets supplemented with critical amino acids (21 and 19%) had beneficial effect on the growth performance during prestarter and starter phase. The broilers showed an ability to respond to increase in dietary CP levels during finisher phase.

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Section: )supporting

confidence: 82%

Effect of different levels of dietary crude protein on the growth performance and carcass characteristics of commercial broilers at different phases of growth

Srilatha

Reddy

Preetam

et al. 2017

IJAR

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“…Determining AA requirements also aims at reducing body fat deposition, because AA deficiency or excess may cause imbalances that limit the growth of the lean tissues, increasing fat deposition, as energy can be obtained by AA deamination (Leeson et al, 1996). These results contradict previous findings that showed that broilers fed diets containing higher AA concentrations had higher carcass (Nasr, 2011) and breast (Corzo et al, 2010) yields. However, other studies did not observe any influence on carcass yields when dietary CP was reduced (Coneglian et al, 2010;Khan et al, 2011).…”

Section: Effect Of Different Dietary Concentrations Of Amino Acids Oncontrasting

confidence: 57%

“…On the other hand, no FI difference was found when low-protein diets, with or without AA supplementation, were compared (Khan et al, 2011). Cobb 500 broilers fed alternated diets with different AA concentrations (Low-High-High and MediumHigh-High) from 1 to 14, 15 to 28 and 29 to 42 days of age, showed the same FI and BWG at 42 d than those fed High-High-High AA concentrations (Corzo et al, 2010). In a similar study, broiler performance was evaluated by feeding three protein profiles, including Medium (similar to those used in the Brazilian industry), High (15% higher) and Low (15% lower), from 1 to 21 and 22 to 42 days (Coneglian et al, 2010).…”

Section: Effect Of Different Dietary Concentrations Of Amino Acids Onmentioning

confidence: 99%

“…had a higher percentage of abdominal fat compared with those that consuming high AA concentrations (Corzo et al, 2010). Determining AA requirements also aims at reducing body fat deposition, because AA deficiency or excess may cause imbalances that limit the growth of the lean tissues, increasing fat deposition, as energy can be obtained by AA deamination (Leeson et al, 1996).…”

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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“…2, foram semelhantes aos encontrados por Corzo et al (2010), Tang et al (2011), Lai et al (2012 Silva et al (2011). Em relação aos outros avaliadores de qualidade de ajuste (AIC e BIC), de forma geral, os modelos da "família" de Richards (Gompertz e von Bertalanffy) foram os que apresentaram os melhores avaliadores de qualidade, mostrando a superioridade desses modelos, nas condições aqui avaliadas.…”

Section: Resultsunclassified

Seleção e classificação multivariada de modelos não lineares para frangos de corte

Veloso

Winkelstroter

Silva

et al. 2016

Arq. Bras. Med. Vet. Zootec.

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RESUMOObjetivou-se com este estudo utilizar a técnica de análise de agrupamento para classificar modelos de regressão não lineares usados para descrever a curva de crescimento de frangos de corte, levando em consideração os resultados de diferentes avaliadores de qualidade de ajuste. Para tanto, utilizaram-se dados de peso corporal e idade dos seguintes grupos genéticos de frangos de corte: Cobb500, Hubbard Flex e Ross308, de ambos os sexos, constituindo, assim, seis classes. Foram ajustados 10 modelos não lineares, cuja qualidade de ajuste foi medida pelo coeficiente de determinação ajustado, pelos critérios de informação de Akaike e bayesiano, pelo quadrado médio do erro e pelo índice assintótico. A análise de agrupamento indicou os modelos logístico, Michaelis-Menten, Michaelis-Menten modificado e von Bertalanffy como os mais adequados à descrição das curvas de crescimento das seis classes estudadas. Palavras-chave: agrupamento, curva de crescimento, idade, peso corporal ABSTRACT The aim of this study was to classify non-linear models used to describe the growth curve of broilers using the cluster analysis technique, taking into account the results of different measures of quality

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Responses of Cobb × Cobb 500 broilers to dietary amino acid density regimens

Cited by 38 publications

References 11 publications

Effect of different levels of dietary crude protein on the growth performance and carcass characteristics of commercial broilers at different phases of growth

Effect of different levels of dietary crude protein on the growth performance and carcass characteristics of commercial broilers at different phases of growth

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

Seleção e classificação multivariada de modelos não lineares para frangos de corte

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