Performance and carcass characteristics of broiler chickens with different growth potential and submitted to heat stress

Rosa, P. S.; Filho, D. E. Faria; Dahlke, Fabiano; Vieira, B. S.; Macari, Marcos; Furlan, Renato Luís

doi:10.1590/s1516-635x2007000300007

Cited by 45 publications

(39 citation statements)

References 22 publications

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“…However, the GRW (%) was higher in quails kept under ceramic roof compared to those kept under the fiber cement roof. This result is in agreement with those of studies with broiler chickens, in which the authors reported a reduction in the GRW (%) of birds kept at higher temperatures as an adaptation to reduce endogenous heat production (OLIVEIRA NETO et al, 2000;OLIVEIRA et al, 2006;ROSA et al, 2007).…”

Section: )supporting

confidence: 92%

Effect of shed rooftype and babassu pie on the productive characteristics of meat quails

Borges

Siqueira

Diniz

et al. 2017

SCA

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We aimed to evaluate the effects of shed roof(SR) typeand the inclusion of babassu pie (BP) in rations on the productive characteristics ofmeat quailsfrom days 14 to 28 and days14 to 40. We studied 896 meatquails. The experimental design was completely randomized with a 4x4 factorial arrangement, using four types of shedroofs (fiber cement, ceramic, straw, and painted fiber cement) and four rations (with 0, 5, 10, and 15% inclusion of babassu pie). The performance variables evaluated from 14 to 28 and 14 to 40 days included food intake (FI, g/bird), mean weight gain (WG, g/bird), food conversion (FC, g/g), mean live weight on day 28 (MW28, g/bird), mean live weight on day 40 (MW40, g/bird), and energy efficiency (EF; g Mcal). After slautherthe birds on day 40, we measured the carcass weight (CW) and the carcass yield (CY, %), obtained for the breast (BY), legs (LGY), and wings (WINGY). We also obtained the relative weight of the heart (HRW), liver (LRW), gizzard (GRW), and intestine (IRW). To compare the economic efficiency between the experimental rations, we analyzed the cost of ration per kg of carcass (CC) and determined the gross margin (GM). Between day 14 and day 28, we found that the use of SR influenced the FI28, WG28, and the MW28 of the quails (p < 0.05). BP did not affect FI28 (p > 0.05), but it linearly improved WG28, FC28, MW28, and EF28. Between days 14 and 40, we found that SR influenced the WG40, FC40, MW40, and EF40 of the quails (p < 0.05) and that a BP increased the FI40, WG40, and MW40 in a quadratic manner. SR and BP did not affect the CW, BY, WINGY, LGY, HRW, LRW,or IRW. However, BP influenced MGRW, which increased linearly with the inclusion of BP. We concluded that a ceramic roof provides better environmental conditions than do other shed roofs. The inclusion of BP improved the performance characteristics, and it was technically feasible to include up to 15% BP in the rations of meat quails. Based on the current cost analysis, however, the inclusion of BP is economically unfeasible. ResumoObjetivou-se avaliar os efeitos do tipo de cobertura do galpão (TC) e da inclusão da torta de babaçu nas rações (TB), sobre as características produtivas de codornas de corte dos 14 aos 28 e dos 14 aos 40 dias de idade. Foram utilizadas 896 codornas de linhagem de corte. O delineamento experimental foi o inteiramente casualizado em arranjo fatorial 4x4, sendo quatro tipos de coberturas nos galpões (fibrocimento, cerâmica, palha e fibrocimento pintado) e quatro rações (0, 5, 10 e 15% de inclusão de torta de babaçu). As variáveis de desempenho avaliadas dos 14 aos 28 e dos 14 aos 40 dias foram: consumo de ração (CR; g/ave), ganho de peso médio (GP; g/ave), conversão alimentar (CA; g/g), peso vivo médio aos 28 dias (PM28; g/ave); peso vivo médio aos 40 dias (PM40; g/ave) e eficiência energética (EF; g/Mcal) e após o abate no 40º dia, foi obtido o peso da carcaça (PC) e o rendimento (%) de carcaça (RC) de peito (RP), pernas (RPN) e asas (RASA), bem como os pesos relativos do coração (PRC), fígado (...

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Section: )supporting

confidence: 92%

Effect of shed rooftype and babassu pie on the productive characteristics of meat quails

Borges

Siqueira

Diniz

et al. 2017

SCA

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“…Although under natural conditions the ambient temperature is not constant, the majority of the studies on the effects of heat stress on the performance and physiological responses of birds were conducted at high constant temperatures (OLIVEIRA NETO et al, 2000;OLIVEIRA et al, 2006aOLIVEIRA et al, , 2006bROSA et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Effect of age and cyclical heat stress on the serum biochemical profile of broiler chickens

Bueno¹,

Nascimento²,

Martins³

et al. 2017

SCA

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This study aimed to evaluate the influence of age and cyclical heat stress for 1 hour per day on the levels of serum proteins, metabolites, and enzymes in broiler chickens of 21-42 days of age. We used 420 male broiler chickens, Cobb Avian48TM breed, in a completely randomized experimental design, composed of two treatments and six replicates. The treatments consisted of two thermal environments: one in which broiler chickens were raised under natural conditions of temperature and humidity for the first 42 days of age (control) and another in which chickens were subjected to heat stress at 36°C, from days 16 to 42, for 1 hour per day (1200-1300 hours). At 21, 28, 35, and 42 days of age, approximately 5 mL of blood was collected by cardiac puncture in two birds per replicate. In each serum sample, levels of total protein, albumin, globulin, albumin:globulin ratio, aspartate aminotransferase (AST), alanine aminotransferase (ALT), and gamma-glutamyltransferase (GGT) activity and uric acid, creatinine, total cholesterol, triglycerides, high-density lipoproteins (HDL), very low density lipoproteins (VLDL), low-density lipoproteins (LDL), and glucose levels were determined. Concerning the environment and the age, no significant differences in the levels of glucose, uric acid, ALT, triglycerides, and very low density lipoproteins were observed. There was a significant interaction between the environment and the age for cholesterol and LDL values. At 21 days of age, cholesterol and LDL-cholesterol (LDL-C) were higher in birds under stress than in the control treatment birds, which did not occur in other age groups. Aspartate aminotransferase activity was higher in chickens under cyclical heat stress than in chickens subjected to control treatment and displayed a cubic response regarding the environment. The age of the birds influenced the values of total protein, albumin, globulin, albumin:globulin (A:G) ratio, creatinine, GGT, and HDL. In conclusion, cyclical heat stress, at 36ºC, for one hour, from days 16 to 42 of age increases serum AST, whereas cholesterol and LDL-C levels increase only at day 21, indicating that birds may have adapted to heat stress. Age influenced the activity of AST and GGT and levels of creatinine, total protein, albumin, globulin, A:G ratio, cholesterol, HDL-C, and LDL-C. Key words: Poultry. Cholesterol. Liver enzymes. Glucose. ResumoObjetivou-se avaliar a influência da idade e do estresse cíclico por calor durante uma hora por dia, nas concentrações das proteínas, metabólitos e enzimas séricas em frangos de corte de 21 a 42 dias de idade. Foram utilizados 420 pintos de corte machos, da linhagem Cobb Avian48 TM , em um delineamento inteiramente casualizado, composto de dois tratamentos e seis repetições. Os tratamentos foram constituídos de dois ambientes térmicos: um para frangos de corte criados em condições naturais de temperatura e umidade do primeiro ao 42° dia de idade (controle); e outro para estressados por calor à 36 °C do 16° ao 42° dia, durante uma hora do dia (12h00m às 13...

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“…However, this was not the case, which suggested that for physiological adaptation, there was no need to reduce the relative weight of these organs; the results were different from those obtained with broilers (ROSA et al, 2007;OLIVEIRA NETO et al, 2000). Rosa et al (2007) observed a decrease in the relative weights of the heart and liver in broiler chickens (42 days of age) kept under heat stress (32 °C), compared with those kept at thermoneutral conditions (23 °C). These authors linked the reduction in maintenance requirements to the decrease in mass of the internal organs and the lower metabolic activity of these organs in the birds kept at 32 °C.…”

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confidence: 80%

“…Studies with broilers demonstrated that high temperatures (32 °C) induce a reduction in the size of the most metabolically active organs, in order to reduce the production of body heat, which results in increased carcass ratio:weight after fasting, and consequently, the increase of the carcass yield (OBA et al, 2012;ROSA et al, 2007); however, these changes were not evident in meat quails at 28 or 42 days of age.…”

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confidence: 99%

“…Evaluating the effect of environment on carcass characteristics of broilers at 42 days of age, Rosa et al (2007) observed that an environment at 32 °C resulted in an increase in carcass (2.58%) and thigh + drumstick (2.61%) yield, along with lower breast yield (11.19%), when compared with the group that was kept at 23 °C. Oba et al (2012) also observed an increase in the thigh + drumstick yield (34.65%) and reduced breast yield (31.98%) in 47-day old broilers kept at 32 °C, compared with those kept at 22 °C.…”

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Productive characteristics of meat quails reared in different environments

Bonfim

Siqueira

Bomfim

et al. 2016

SCA

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The objective of this study was to evaluate the effects of ambient temperature and consumption on the performance, carcass yields and cuts, organs, and body temperatures of meat quails. The experiment was conducted at the Federal University of Maranhão, campus of Chapadinha-MA, during September to October 2013. From the 14th day of age, 450 meat quails, not sexed, with an average initial weight of 90.4 ± 12.9 g, were distributed in batteries and accommodated in either acclimatized or non-acclimatized rooms, until 42 days of age. The experimental design was completely randomized, with three treatments, and six replicates of 25 birds each. The treatments were CE (acclimatized environment at 26 °C); NE (natural environment), and CECC (acclimatized environment at 26 °C with controlled feed, to keep the same consumption level as that of the birds in NE). The evaluated variables at 28 and 42 days of age were as follows: (1) the intake of feed, weight gain, feed conversion, body weight, and energy efficiency to weight gain, (2) the carcass weight, carcass yields (%) for breast, thigh, drumstick, and wing, and (3) the relative weights (%) of the digestive tract, heart, liver, gizzard, and intestine. In addition, we evaluated the cloacal and surface temperatures (°C), and subsequently, calculated the average and surface body temperatures. The treatment means were compared using the Student-Newman-Keuls test, with 5% level of significance. Compared with the acclimatized ambient environment, the natural environment more favored the performance of quails up to 28 days, but then affected it negatively from that age onward. Carcass yield, organs, and internal temperature of the quails maintained in the acclimatized and natural environments were not influenced. Universidade Federal do Maranhão, campus de Chapadinha-MA, no período de setembro a outubro de 2014. A partir do 14º dia de idade, 450 codornas de corte, não sexadas, com o peso inicial médio de 90,4 ± 12,9g, foram distribuídas em baterias, acondicionadas em sala climatizada e não climatizada, até o 42° dia. O delineamento experimental foi o inteiramente casualizado, com três tratamentos e seis repetições de 25 aves. Os tratamentos consistiram em: AC (Ambiente climatizado com temperatura de 26°C); AN (Ambiente natural) e ACCC (Ambiente climatizado com temperatura de 26°C com alimentação controlada para manter o mesmo consumo das aves mantidas no AN). Foi avaliado o consumo de ração, ganho de peso, conversão alimentar, peso vivo, eficiência energética para ganho de peso; o peso de carcaça, rendimentos (%) de carcaça, peito, coxa, sobrecoxa e asa; os pesos relativos (%) do trato digestório, coração, fígado, moela e intestino aos 28 e aos 42 dias. Também foram avaliadas as temperaturas (°C) cloacais e superficiais, e posteriormente, calculadas a superficial média e corporal média. As médias dos tratamentos foram comparadas pelo teste SNK considerando o nível de 5% de significância. O ambiente natural melhorou o desempenho das codornas até os 28 dias, prejudicando a...

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Performance and carcass characteristics of broiler chickens with different growth potential and submitted to heat stress

Cited by 45 publications

References 22 publications

Effect of shed rooftype and babassu pie on the productive characteristics of meat quails

Effect of shed rooftype and babassu pie on the productive characteristics of meat quails

Effect of age and cyclical heat stress on the serum biochemical profile of broiler chickens

Productive characteristics of meat quails reared in different environments

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