Model of physiological stress in chickens 1. Response parameters

Puvadolpirod, S.; Thaxton, J. P.

doi:10.1093/ps/79.3.363

Cited by 252 publications

(155 citation statements)

References 37 publications

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“…Results of the present study showed that breeder age had no effect on organ weights measured, which is in agreement with Maiorka et al (2004) (Table 3). Previous studies showed an increase in liver weight (Malheiros et al 2003;Lin et al 2006) and decrease in spleen, bursa of fabricius, and heart weights under stressful conditions (Puvadolpirod and Thaxton 2000;Lin et al 2006). There was no lighting regimen effect on relative weights of heart, liver, and bursa of fabricius.…”

Section: Resultsmentioning

confidence: 91%

Effect of breeder age and lighting regimen on growth performance, organ weights, villus development, and bursa of fabricius histological structure in broiler chickens

El-Sabry¹,

Yalçın²,

Turgay-İzzetoğlu³

2015

CZECH J ANIM SCI

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ABSTRACT:This study was carried out to investigate the effect of breeder age and lighting regimen on performance, some organ weights, villus development, and bursa of fabricius histological structure in broiler chickens. A total of 384 one-day-old chicks were obtained from two Ross broiler breeder flocks at 32 (young;Y) and 49 (old, O) weeks of age. Chicks from each breeder age were reared under 18 h light : 6 h dark (18 L : 6 D) (control; CL) or 14 L : 4 D : 2 L : 4 D (split darkness, SD). Body weight, feed intake, feed conversion ratio, and mortality were measured weekly during the experiment. At 21 days of age, liver, heart, spleen, and bursa of fabricius weights were recorded, gastrointestinal tract and jejunum lengths were measured, and histomorphometry of villi and bursa of fabricius structure were investigated. Interaction between breeder age and lighting regimen was observed, where Y-CL chicks had the lightest body weight from 7 to 35 days (P < 0.05). Neither breeder age nor lighting regimen influenced feed conversion ratio. SD chicks had longer (P < 0.05) gastrointestinal tract and jejunum, and wider villus in comparison to CL chicks. Lower relative spleen weight was observed in CL chicks compared to SD ones (P < 0.05). It was concluded that split darkness lighting regimen could be used for broiler chickens from young breeders to improve live body weight without affecting feed conversion ratio.

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Section: Resultsmentioning

confidence: 91%

Effect of breeder age and lighting regimen on growth performance, organ weights, villus development, and bursa of fabricius histological structure in broiler chickens

El-Sabry¹,

Yalçın²,

Turgay-İzzetoğlu³

2015

CZECH J ANIM SCI

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“…Os resultados corroboram os encontrados por Puvadolpirod & Thaxton (2000), que, injetando o hormônio ACTH em aves, em uma simulação do que acontece no EPC, não encontraram diferenças na quantidade de células vermelhas. No caso deste experimento, o estresse cíclico por calor pode ter sido ameno a ponto de não causar desidratação, nem alterações no eritrograma dos frangos.…”

Section: Resultsunclassified

“…Este achado corrobora os obtidos por Revidatti et al (2002), que não encontraram diferenças para glicose de frangos submetidos a estresse por manejo. Segundo Puvadolpirod & Thaxton (2000), que encontraram maiores valores de glicose em frangos injetados com hormônio ACTH, a hiperglicemia relaciona-se com quadros de estresses agudos nos quais o fator de estresse atua de forma súbita. As respostas observadas neste experimento indicam possível aclimatação das aves sob EPC (González & Silva (2003).…”

Section: Médias Seguidas Por Letras Diferentes Na Coluna Diferem (Meaunclassified

Níveis dietéticos de proteína e gordura e parâmetros bioquímicos, hematológicos e empenamento em frangos de corte estressados pelo calor

Laganá¹,

Ribeiro

González

et al. 2007

R. Bras. Zootec.

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RESUMO -Avaliaram-se dietas com diferentes níveis de PB e gordura e seus efeitos sobre o empenamento e os parâmetros hematológicos e bioquímicos de frangos de corte submetidos a estresse cíclico por calor (EPC) desde os 21 dias ou em ambiente termoneutro (ATN). Foi adotado esquema fatorial 2 x 2 + 2, com dois ambientes -ATN (21-25°C e UR 73%) e EPC (25-32°C e UR 65%) e duas dietas (D) -controle (2,4% gordura e 19,5% proteína) e verão (DV) (4,0% de gordura e 18,5% de proteína com suplementação de Lys e Met + Cys no nível da dieta controle). No ambiente ATN, foram elaboradas outras duas dietas, com quantidade equalizada de ração em relação ao EPC, para ambas as dietas. Foram realizadas análises bioquímicas e hematológicas em seis aves/tratamento, aos 42 dias de idade, e pesados a bursa e baço; em 288 aves foi avaliado o rendimento de penas (RP). A DV para frangos de corte em EPC foi capaz de amenizar parte das alterações observadas no calor, resultando em melhor peso relativo de bursa, menor número de leucócitos totais e menor relação heterófilo/ linfócito. Ambiente e dietas não alteraram os parâmetros bioquímicos séricos. Aves com consumo à vontade no ATN apresentaram RP 15% maior que aves no EPC, embora a restrição alimentar tenha diminuído o RP para as aves com consumo equalizado. As dietas não afetaram o RP. Os dados sugerem que tanto o EPC quanto a restrição alimentar são fatores aditivos em diminuir produção de penas.Palavras-chave: empenamento, estresse por calor, hematologia, gordura, proteína Dietary levels of protein and fat on biochemical and hematological parameters and on feathering in heat stressed broilers ABSTRACT -The objective was to evaluate diets with different levels of CP and fat, and their effect on feathering and hematological and biochemical parameters of broilers submitted to cyclic heat stress (HS) since 21 d of age or in thermoneutral environment (TN). A factorial 2 x 2 + 2 was used, with two environments-TN (21-25°C and RH 73%) and HS (25-32°C and RH 65%), and two diets (D) -control (2.4% fat and 19.5%CP) and summer (SD) (4.0% fat and 18.5% CP with Lys and Met + Cys supplemented at the control diet level). On TN environment, two more diets were formulates, with the amount equalized (pair feed) of ration in relation to HS, for both diet. Biochemistry and hematological analyses were carried out in six birds/ treatment, at 42 days-old, and bursa and spleen weighed and feather yield (FY) was evaluated in 288 birds. The DV for broiler in EPC was capable to attenuate part of the alterations observed in the heat, resulting in better relative weight of bursa, small number of total leukocytes and smaller heterophils/lynphocytes relationship. Environment and diets did not change biochemistry serum parameters. Birds with ad libitum intake in the ATN showed FY 15% greater that birds in the HS, even so the feed restriction decreased RP for the birds with pair feed intake. Diets did not influence FY. Data suggests that either HS or feed intake restriction are additive factors that decrease feather p...

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“…It is known that stress conditions affect the H/L ratio and leukocyte count (Gross & Siegel 1983;Puvadolpirod & Thaxton 2000). Under stress conditions, the number of lymphocyte, eosinophil, monocyte and haematocrit values shows a decline, whereas the number of basophil and heterophil increases.…”

Section: Discussionmentioning

confidence: 99%

The effects of access to pasture on growth performance, behavioural patterns, some blood parameters and carcass yield of a slow-growing broiler genotype

İpek

Sözcü

2016

Journal of Applied Animal Research

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The aim of the present study was to determine the effects of access to a pasture on growth performance, behavioural patterns, some blood parameters and carcass yield of a slow-growing broiler genotype. A total of 210 one-day-old male chicks of Hubbard ISA Red JA were used in the experiment. At the 84th day, live weight was determined to be lower in the outdoor rearing system (P < .01). Better feed conversion ratio was found in the indoor rearing system (P < .01). The behaviour of the broilers was compared by observing the behaviour of three randomly selected marked birds on video tape. Eating, drinking, preening, spot pecking, feather pecking, walking-standing and resting-lying were monitored. Broilers from the outdoor rearing system group showed more preening, drinking, spot pecking, walk-stand and feather pecking behaviours as a result of increasing activity. Ratio of breast and thigh (carcass weight%) was higher, whereas abdominal fat was lower in the outdoor group. As a result of this study, access to a pasture improved the behaviours of broilers. ARTICLE HISTORY

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Model of physiological stress in chickens 1. Response parameters

Cited by 252 publications

References 37 publications

Effect of breeder age and lighting regimen on growth performance, organ weights, villus development, and bursa of fabricius histological structure in broiler chickens

Effect of breeder age and lighting regimen on growth performance, organ weights, villus development, and bursa of fabricius histological structure in broiler chickens

Níveis dietéticos de proteína e gordura e parâmetros bioquímicos, hematológicos e empenamento em frangos de corte estressados pelo calor

The effects of access to pasture on growth performance, behavioural patterns, some blood parameters and carcass yield of a slow-growing broiler genotype

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