Exigências de metionina + cistina para frangos de corte fêmeas de 1 a 21 e de 22 a 42 dias de idade criados em região de clima tropical

Junior, René Geraldo Cordeiro Silva; Lana, Geraldo Roberto Quintão; Rabello, Carlos Bôa-Viagem; Lana, Sandra Roselí Valerio; Barboza, Walter Amaral

doi:10.1590/s1516-35982006000200023

Cited by 6 publications

(1 citation statement)

References 10 publications

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“…Because of its importance in maintenance functions and muscle deposition that are greatly impacted during exposure to HS, defining Met requirements is an important step in optimizing poultry nutrition under HS conditions. Indeed, higher requirements of Met have been found in broilers under high temperatures compared to thermoneutral conditions ( Silva Junior et al, 2006 ; Sahebi-Ala et al, 2021 ), but this does not appear to be the case in laying hens or pullets ( Bunchasak and Silapasorn, 2005 ; Castro et al, 2019 ). Several physiological mechanisms have been proposed regarding the importance of Met under HS.…”

Section: Supplementation Of Amino Acidsmentioning

confidence: 99%

A review of heat stress in chickens. Part II: Insights into protein and energy utilization and feeding

et al. 2022

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With the growing global demand for animal protein and rising temperatures caused by climate change, heat stress (HS) is one of the main emerging environmental challenges for the poultry industry. Commercially-reared birds are particularly sensitive to hot temperatures, so adopting production systems that mitigate the adverse effects of HS on bird performance is essential and requires a holistic approach. Feeding and nutrition can play important roles in limiting the heat load on birds; therefore, this review aims to describe the effects of HS on feed intake (FI) and nutrient digestibility and to highlight feeding strategies and nutritional solutions to potentially mitigate some of the deleterious effects of HS on broiler chickens. The reduction of FI is one of the main behavioral changes induced by hot temperatures as birds attempt to limit heat production associated with the digestion, absorption, and metabolism of nutrients. Although the intensity and length of the heat period influences the type and magnitude of responses, reduced FI explains most of the performance degradation observed in HS broilers, while reduced nutrient digestibility appears to only explain a small proportion of impaired feed efficiency following HS. Targeted feeding strategies, including feed restriction and withdrawal, dual feeding, and wet feeding, have showed some promising results under hot temperatures, but these can be difficult to implement in intensive rearing systems. Concerning diet composition, feeding increased nutrient and energy diets can potentially compensate for decreased FI during HS. Indeed, high energy and high crude protein diets have both been shown to improve bird performance under HS conditions. Specifically, positive results may be obtained with increased added fat concentrations since lipids have a lower thermogenic effect compared to proteins and carbohydrates. Moreover, increased supplementation of some essential amino acids can help support increased amino acid requirements for maintenance functions caused by HS. Further research to better characterize and advance these nutritional strategies will help establish economically viable solutions to enhance productivity, health, welfare, and meat quality of broilers facing HS.

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Section: Supplementation Of Amino Acidsmentioning

confidence: 99%

A review of heat stress in chickens. Part II: Insights into protein and energy utilization and feeding

et al. 2022

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Effects of Nutritional Levels on Performance, Carcass Characteristics and Nutrient Digestibility of Sexed Broilers

Muñoz

Suckeveris

Demuner

et al. 2018

Rev. Bras. Cienc. Avic.

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The objective of this study was to evaluate the effects of dietary nutrient levels on performance, carcass yield, commercial cuts, digestibility and economical viability of broilers from 1 to 42 days of age. During the experiment, 180 COBB 500™ chicks were housed in metal batteries and subjected to a completely randomized design in a 2x3 factorial arrangement, of two sexes and three diets (male, female and mixed), totaling 6 treatments and 6 repetitions of 5 birds each. Data were subjected to statistical analysis and the means were compared using the Tukey test, at 5% probability. The results indicate the effect of sex on performance and commercial cuts, except for breast and thigh fillets, in which males and females showed similar results when given the mixed diet. The influence of the nutritional levels on performance, digestibility and commercial cuts was observed, in which the female diet showed the highest results for feed intake, body weight and weight gain, in addition to greater retention of protein and crude energy. For drumstick and abdominal fat yield, the highest values were obtained using the mixed diet and the female diet, and the lowest values were obtained using the male diet. Regarding economic viability, the female diet showed the highest return per unit of Real (R$) spent on feed. Therefore, these data prove that the female diet had a positive effect when provided to both sexes, and it may be a promising alternative for its application at the production level.

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Relação metionina + cistina / lisina digestível para frangos de corte cobb

et al. 2014

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Em vista da constante evolução do melhoramento genético de frangos de corte, torna-se necessária a determinação das exigências nutricionais dessas aves, para assegurar seu desempenho. Assim sendo, dois experimentos foram realizados, com o objetivo de avaliar diferentes relações de metionina + cistina / lisina digestível sobre o desempenho de frangos de corte, nas fases de 11 a 21 e 22 a 35 dias de idade. O delineamento experimental nas duas fases avaliadas foi o de blocos casualizados, em arranjo fatorial 2x5+2, (2 sexos e 5 diferentes relações met+cis/lis digestível e um tratamento controle para cada sexo), com oito repetições de 23 e 20 aves (COBB 500) por unidade experimental, nas fases descritas. As dietas atenderam às exigências, exceto para metionina + cistina e lisina. Para evitar o excesso de lisina digestível, seu nível foi calculado para 97% do recomendado para todas as fases. O tratamento controle foi adequado em lisina e metionina + cistina. As relações metionina + cistina/lisina digestível, para máximo desempenho de frangos de corte, machos e fêmeas, respectivamente, são de 75,53 e 78,23%, na fase de 11 a 21 dias, e 78,83 e 79,82%, na fase de 22 a 35 dias.

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Exigências de metionina + cistina para frangos de corte fêmeas de 1 a 21 e de 22 a 42 dias de idade criados em região de clima tropical

Cited by 6 publications

References 10 publications

A review of heat stress in chickens. Part II: Insights into protein and energy utilization and feeding

A review of heat stress in chickens. Part II: Insights into protein and energy utilization and feeding

Effects of Nutritional Levels on Performance, Carcass Characteristics and Nutrient Digestibility of Sexed Broilers

Relação metionina + cistina / lisina digestível para frangos de corte cobb

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