Dietas de baixa proteína no desempenho de frangos criados em diferentes temperaturas

Filho, Daniel Emygdio de Faria; Rosa, P. S.; Figueiredo, Denise Fontana; Dahlke, Fabiano; Macari, Marcos; Furlan, Renato Luís

doi:10.1590/s0100-204x2006000100014

Cited by 25 publications

(6 citation statements)

References 14 publications

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“…The worst nitrogen balance for broilers under heat stress has occurred due to the lower efficiency of nitrogen retention, with protein metabolization reduced by heat, regardless of sex and diet. (18,33,34,35) A similar result was observed for EEB and TEEB, with a worse balance for animals under heat stress. However, broilers raised under thermoneutral temperature at the growing phase had no differences compared to animals raised under hot temperature.…”

Section: Resultssupporting

confidence: 68%

Environmental temperature and broiler age on corn energy value

et al. 2021

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This study aimed to assess the effects of environmental temperature and age of broilers on the energy value of corn. A total of 288 Cobb 500 chicks were distributed in a complete randomized design with a split-plot arrangement and six replications of six chicks each. The main plot consisted of three temperatures (cold: 18 ºC; thermoneutral: 25 ºC; and hot: 33 ºC), while the secondary plot consisted of age (initial: 11 to 14 days; growing: 25 to 28 days; and final: 39 to 42 days). The basal diet was based on corn and soybean meal. The test diet was produced by replacing the basal diet for test food: 40% corn + 60% basal diet. The mean values of AMEn observed for broiler chicks under cold, thermoneutral, and hot temperatures were 3322, 3279, and 3233 kcal/kg of natural matter, respectively, and 3215, 3218, and 3400 kcal/ kg of natural matter for the initial, growing, and final phases, respectively. Overall, the metabolizable energy values of corn and the balance and coefficients of metabolizability of nutrients in the test diet increased with the broiler age, but the true metabolizable energies of corn were not affected by environmental temperature. The balance and coefficients of metabolizability of nutrients in the test diet decreased due to heat exposure during the growing and final phases.

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Section: Resultssupporting

confidence: 68%

Environmental temperature and broiler age on corn energy value

et al. 2021

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“…Such results indicate that high-protein diets do not increase heat production, since muscle turnover is highly associated to heat production (Macleod, 1997). The lack of heat production in broilers fed high protein levels was also found by Faria Filho (2006). These findings support the utilization of diets with high protein levels even in hot environments.…”

Section: Surface Responsementioning

confidence: 60%

Response surface models to predict broiler performance and applications for economic analysis

Filho

Rosa

Torres

et al. 2008

Rev. Bras. Cienc. Avic.

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A study was carried out to elaborate response surface models using broiler performance data recovered from literature in order to predict performance and elaborate economic analyses. Nineteen studies published between 1995 and 2005 were retrieved using the systematic literature review method. Weight gain and feed conversion data were collected from eight studies that fulfilled the pre-established inclusion criteria, and a response surface model was adjusted using crude protein, environmental temperature, and age as independent variables. The models produced for weight gain (r² = 0.93) and feed conversion (r² = 0.85) were accurate, precise, and not biased. Protein levels, environmental temperature and age showed linear and quadratic effects on weight gain and feed conversion. There was no interaction between protein level and environmental temperature. Age and crude protein showed interaction for weight gain and feed conversion, whereas interaction between age and temperature was detected only for weight gain. It was possible to perform economic analyses to determine maximum profit as a function of the variables that were included in the model. It was concluded that the response surface models are effective to predict the performance of broiler chickens and allow the elaboration of economic analyses to optimize profit

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“…Similarly, several researchers have demonstrated reduced excretion of N by birds due to lower ingestion of this element when low-CP diets and supplementation of industrial amino acids are used (Waldroup et al, 1976;Aletor et al, 2000;Corzo et al, 2005;Faria Filho et al, 2006;Kamran et al, 2010;Vasconcellos et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Digestible lysine levels obtained by two methods of formulation of diets for 22-to-42-day-old broilers

Oliveira

Donzele

et al. 2014

R. Bras. Zootec.

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-The objective of this study was to evaluate the effect of digestible lysine levels in diets with or without supplementation of industrial amino acids on performance, carcass characteristics and nitrogen excretion in broilers of 22 to 42 days of age. Birds were distributed in a completely randomized experimental design in a 4 × 2 factorial arrangement, with four digestible lysine levels (9.0, 10.0, 11.0 and 12.0 g/kg) and two methods to obtain the lysine levels (variation in the proportion of corn and soybean meal, without supplementation; or supplementation of industrial amino acids), eight replicates and 20 birds per replicate. There was an interaction effect on the performance characteristics and on the weights and yields of prime cuts. In both diets, feed conversion improved linearly as the lysine levels were increased. Feed intake; weight gain; carcass, thigh and drumstick weights; and boneless breast yield increased and abdominal fat reduced linearly as the lysine levels were increased in the unsupplemented diet. The lysine levels of the supplemented diets linearly reduced the yield of drumstick and quadratically reduced the yields of bone-in and boneless breast up to the estimated levels of 10.4 and 10.7 g/kg, respectively. Diets without supplementation increased the excretion and retention of nitrogen. The levels of 9.0 and 12.0 g/kg digestible lysine obtained with supplementation of industrial amino acids and without it, respectively, provide the best performance and yield of prime cuts in the birds. Diets in which the digestible lysine levels are obtained without supplementation provide better performance responses and carcass characteristics compared with supplemented diets.

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Dietas de baixa proteína no desempenho de frangos criados em diferentes temperaturas

Cited by 25 publications

References 14 publications

Environmental temperature and broiler age on corn energy value

Environmental temperature and broiler age on corn energy value

Response surface models to predict broiler performance and applications for economic analysis

Digestible lysine levels obtained by two methods of formulation of diets for 22-to-42-day-old broilers

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