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Ingredient classification according to the digestible amino acid profile: an exploratory analysis 89
Faria Filho,DE; Torres,KAA; Campos,DMB; Vieira,BS; Urbano,T; Rosa,PS; Ferraudo,AS.
This study aimed: 1) to classify ingredients according to the digestible amino acid (AA) profile; 2) to determine ingredients with AA profile closer to the ideal for broiler chickens; and 3) to compare digestible AA profiles from simulated diets with the ideal protein profile. The digestible AA levels of 30 ingredients were compiled from the literature and presented as percentages of lysine according to the ideal protein concept. Cluster and principal component analyses (exploratory analyses) were used to compose and describe groups of ingredients according to AA profiles. Four ingredient groups were identified by cluster analysis, and the classification of the ingredients within each of these groups was obtained from a principal component analysis,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler chicken; Cluster analysis; Ideal protein; Ingredients; Principal component analysis.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000300009
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Performance and carcass characteristics of broiler chickens with different growth potential and submitted to heat stress 89
Rosa,PS; Faria Filho,DE; Dahlke,F; Vieira,BS; Macari,M; Furlan,RL.
In order to evaluate the effects of broiler genotype and of heat exposure on performance, carcass characteristics, and protein and fat accretion, six hundred one-day-old male broilers were randomly assigned in a 2 x 3 factorial arrangement, according to the following factors: genetic group (selected and non-selected broilers) and pair-feeding scheme (Ad32 - reared under heat stress and fed ad libitum; Ad23 - reared at thermoneutrality and fed ad libitum; Pf23 - reared at thermoneutrality and pair fed with Ad32), with a total of six treatments with four replicates of 25 birds each. Independent of pair-feeding scheme, selected broilers showed better feed conversion, higher carcass yield, and lower abdominal fat deposition rate. However, as compared to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allometric coefficient; Carcass yield; Genetic improvement; Heat stress.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000300007
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Effect of energy intake on performance and carcass composition of broiler chickens from two different genetic groups 89
Rosa,PS; Faria Filho,DE; Dahlke,F; Vieira,BS; Macari,M; Furlan,RL.
In order to evaluate the effect of energy intake and broiler genotype on performance, carcass yield, and fat deposition, 600 one-day-old male chicks from two different genetic groups (AgRoss 308 - commercial line and PCLC - Embrapa non-improved line) were fed diets with different metabolizable energy level (2950, 3200 and 3450 kcal/kg). A completely randomized experimental design in a 2X3 factorial arrangement with four replications of 25 birds per treatment was applied. In order to ensure different energy intake among treatments within each strain, feed intake was daily adjusted by pair-feeding schemes. AgRoss 308 broilers had better performance and carcass yield, and presented lower abdominal fat deposition rate. In both genetic groups, the highest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allometric growth; Broiler chickens; Carcass composition; Energy intake; Genetic strains.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000200007
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Protein levels and environmental temperature effects on carcass characteristics, performance, and nitrogen excretion of broiler chickens from 7 to 21 days of age 89
Faria Filho,DE; Rosa,PS; Vieira,BS; Macari,M; Furlan,RL.
This trial was conducted to evaluate the utilization of low-protein diets formulated based on the ideal protein concept for broiler chickens from 7 to 21 days of age reared at different environmental temperatures. Nine hundred male Cobb-500® chickens were used. At day seven chicks were distributed according to a completely randomized design in a 3 x 3 factorial with four replications of 25 birds each. It was used three crude protein levels in the diet (21.5; 20.0 and 18.5%) and three environmental temperatures (low, thermoneutral and high). The performance, carcass characteristics (yield and chemical composition), and nitrogen ingestion and excretion were assessed. There was no significant interaction among the factors for the evaluated variables....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler Chicks; Environmental temperature; Ideal protein; Nitrogen excretion; Performance.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000400009
Registros recuperados: 4
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