Does excess dietary protein improve growth performance and carcass characteristics in heat-exposed chickens?

Temim, Soraya; Chagneau, Anne-Marie; Guillaumin, Solange; Michel, Joël; Peresson, R.; Tesseraud, Sophie

doi:10.1093/ps/79.3.312

Cited by 90 publications

(47 citation statements)

References 22 publications

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“…Estes resultados estão de acordo com os descritos por Temim et al (2000), que, criando frangos de corte sob condições de estresse por calor, observaram redução na porcentagem do músculo do peito e aumento dos músculos das pernas. Ainda de acordo com esses autores, estes resultados podem ser pelo fato de que a musculatura do peito apresenta metabolismo glicolítico (fibras brancas) e a das pernas, metabolismo oxidativo (fibras vermelhas).…”

Section: Resultsunclassified

Características produtivas e imunológicas de frangos de corte submetidos a dietas suplementadas com cromo, criados sob diferentes condições de ambiente

et al. 2012

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RESUMO -Objetivou-se avaliar o desempenho, a resposta imune e as características de carcaça de frangos de corte alimentados com dietas suplementadas com cromo complexado a levedura (Saccharomyces cerevisae), criados em diferentes condições de temperatura. O experimento foi conduzido em câmaras climáticas com sistema de aquecimento e refrigeração, utilizando-se as seguintes condições de temperatura, de acordo com as idades: 1 a 3 dias (35, 35 e 35 o C ± 2), 4 a 7 dias (35, 30, 25 o C ± 2), 8 a 14 dias (34, 27 e 20 o C ± 2), 15 a 21 dias (33, 26 e 18 o C ± 2) e de 22 a 47 dias (32, 26 e 18 o C ± 2), respectivamente, para temperatura quente, termoneutra e fria. As dietas foram suplementadas com 0, 400, 800, 1.200 μg Cr/kg. A suplementação de 400 μg Cr/kg melhora a viabilidade e, em aves mantidas em temperatura quente, a conversão alimentar, enquanto a temperatura de criação mostrou ter grande influência sobre as características produtivas em todas as fases de criação. As aves criadas em temperatura quente apresentam melhor resposta imune, maior rendimento de carcaça e pernas e resultados inferiores de desempenho e rendimento de peito.Palavras-chave: anticorpo, desempenho, estresse térmico, rendimento carcaça Productive and immunological traits of broiler chickens fed diets supplemented with chromium, reared under different environmental conditionsABSTRACT -The objective of this experiment was to evaluate performance, immune response and traits concerning carcass and poultry cuts of broiler chickens fed diets supplemented with chromium-yeast (Saccharomyces cerevisae), reared under different environmental temperature conditions. Birds were reared in climate chambers with heating and cooling system, using the following environmental temperatures according to ages: from 1 to 3 days of age (35, 35 and 35 o C ± 2), from 4 to 7 days of age (35, 30 and 25 o C ± 2), from 8 to 14 days old (34, 27 and 20 o C ± 2), from 15 to 21 days of age (33, 26 and 18 o C ± 2) and from 22 to 47 days of age (32, 26 and 18 o C ± 2), respectively, for high, thermoneutral and low temperatures.Diets were supplemented with 0; 400; 800; and 1,200 μg Cr/kg. Supplementation with 400 μg Cr/kg enhances the viability and, in birds reared in high temperature, feed conversion as well, while temperature showed to have great influence upon productive traits in every rearing phase. Chickens reared at high temperature presented better immune response, higher carcass dressing percentage and leg quarter yield, but inferior results for breast yield and performance. IntroduçãoOs frangos estão cada vez mais precoces e com maior ganho de peso. Por outro lado, tem se observado aumento de gordura na carcaça, principalmente na região abdominal. A composição da carcaça e o rendimento de carne dependem da nutrição, do manejo, da genética e das condições de ambiente. Sabe-se que altas temperaturas proporcionam menores rendimentos de peito e maior deposição de gordura na carcaça (Ain Baziz et al., 1996). Segundo Furlan & Macari (2002), a zona de conforto térmico das...

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Section: Resultsunclassified

Características produtivas e imunológicas de frangos de corte submetidos a dietas suplementadas com cromo, criados sob diferentes condições de ambiente

et al. 2012

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“…This reduction in FI in turn decreases AA consumed. Therefore, some authors (Alleman and LeClercq, 1997;Temim et al, 1999Temim et al, , 2000 recommended higher AA under such environment. However, our current findings showed that feeding broilers with diets containing AA higher than the requirements under hot and humid condition is unnecessary.…”

Section: Discussionmentioning

confidence: 99%

Amino Acids Fortification of Low-protein Diet for Broilers Under Tropical Climate. 2. Nonessential Amino Acids and Increasing Essential Amino Acids

Awad

Zulkifli

Farjam

et al. 2014

Italian Journal of Animal Science

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A three-week trial was carried out to evaluate the effect of nonessential amino acids (NEAA) supplementation to a low-crude protein (CP) diet with adequate essential amino acids (EAA) level on growth performance, blood metabolites, and relative weights of abdominal fat, breast yield, and internal organs in broiler chickens raised under tropical hot and humid environment. Five isocaloric (3000 metabolisable energy/kg) corn-soybean diets were administered (1 to 21 days) to 5 groups of broilers (60 birds/group) as follows: i) 22.2% CP (positive control; PC); ii) 16.2% CP+all EAA to meet or exceed the National Research Council (1994) recommendations (negative control; NC); iii) NC+further EAA to equal the levels in the PC diet; iv) NC+NEAA to equal the levels in the PC; v) NC+EAA and NEAA to equal the amino acids levels in the PC diet. The results showed that the fortification of EAA alone, only improved feed intake (FI), whereas, addition of NEAA or EAA+NEAA significantly enhanced body weight, daily weight gain, and FI and decreased the feed conversion ratio to the same levels as in PC. Serum uric acid was significantly reduced and serum triglyceride increased in NC group. Dietary treatments had no significant effect on relative weights of heart, liver, abdominal fat, breast meat yield, serum albumin, and serum total protein. In conclusion, these results suggest that NEAA fortification may improve the growth performance of broilers fed an excessive low-CP diet under tropical hot and humid condition.

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“…As to dietary protein concentration, two strategies are suggested to minimize CHS effects on growth rate: a) the use of low-protein diets in order to decrease heat increment, with some authors recommending lowering dietary protein content with the supplementation of essential amino acids (Waldroup, 1976;Austic, 1985;Cheng et al, 1997); and b) the use of high-protein diets to compensate lower feed intake caused by heat, as recommended by Temim et al (2000).…”

Section: Introductionmentioning

confidence: 99%

Effects of the reduction of dietary heat increment on the performance, carcass yield, and diet digestibility of broilers submitted to heat stress

Laganá¹,

Ribeiro

Kessler

et al. 2007

Rev. Bras. Cienc. Avic.

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This experiment aimed at verifying the effect of different diets and thermal environments on the performance, carcass yield, and diet digestibility of 21 to 42-day-old broilers. A total number of 288 21-day-old male Ross broilers were distributed in a 2 x 2 + 2 factorial arrangement, with six replicates, including the following factors: two environments (TNE - thermoneutral: 21-25ºC and 73% RH; CHS - cyclic heat stress: 25-32ºC and 65%RH), and two diets (control: 2.4% soybean oil and 19.5% protein; summer: 4.0% soybean oil and 18.5% protein). In TNE, two additional treatments were included with feed restriction of birds fed both the control and summer diets (pair-feeding), thereby maintaining the same feed intake level for both types of diet. Diet did not influence performance, dry matter and protein digestibilities, or carcass and part yields. TNE birds had better performance (p<0.001) as compared to CHS birds, but FCR was not different. CHS birds had lower breast yield (p<0.0001), and higher thigh yield (p<0.02) than TNE birds. In the pair-feeding treatments, environment did not influence performance, but dry matter digestibility was significantly lower in CHS (p<0.03), whereas protein digestibility was not affected. The difference in feed intake was the main responsible factor for the variation in the performance of heat-stressed birds

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Does excess dietary protein improve growth performance and carcass characteristics in heat-exposed chickens?

Cited by 90 publications

References 22 publications

Características produtivas e imunológicas de frangos de corte submetidos a dietas suplementadas com cromo, criados sob diferentes condições de ambiente

Características produtivas e imunológicas de frangos de corte submetidos a dietas suplementadas com cromo, criados sob diferentes condições de ambiente

Amino Acids Fortification of Low-protein Diet for Broilers Under Tropical Climate. 2. Nonessential Amino Acids and Increasing Essential Amino Acids

Effects of the reduction of dietary heat increment on the performance, carcass yield, and diet digestibility of broilers submitted to heat stress

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