Níveis de cromo orgânico em rações para frangos de corte mantidos sob estresse por calor no período de um a 42 dias de idade

Vaz, Roberta Gomes Marçal Vieira; Oliveira, Rita Flávia Miranda de; Donzele, J. L.; Albino, L. F. T.; Oliveira, Will Pereira de; Silva, B.A.N.

doi:10.1590/s0102-09352009000200028

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…Desta forma, as coberturas verdes, além de contribuir para a redução dos índices de conforto apresentam outras vantagens, como a redução do escoamento superficial (Stovin et al, 2012), da poluição do ar (Gartland, 2010), dos ruídos (Renterghem & Botteldooren, 2009) e da transmissão de energia para o interior da construção. Vaz et al (2009), verificaram que o valor de ITGU de 82,9 na fase final de criação de frangos de corte, caracteriza uma condição de estresse térmico; assim, pode-se inferir que os abrigos estudados apresentaram condição de calor moderado para a maioria das espécies de exploração econômica.…”

Section: Resultsunclassified

Condicionamento térmico primário de instalações rurais por meio de diferentes tipos de cobertura

Carneiro

Guiselini

Pandorfi

et al. 2015

Rev. bras. eng. agríc. ambient.

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RESUMOObjetivou-se, com este trabalho, avaliar o conforto térmico proporcionado por diferentes tipos de cobertura, com base nas análises térmicas e nos índices de conforto térmico humano e zootécnico. A pesquisa foi realizada no período de 20 de março a 29 de maio de 2014, na UFRPE, no município de Recife, PE. Os tipos de cobertura analisados foram: telha de fibrocimento (Tfib), telha reciclada (Trec), telhado verde, grama, Zoysia japonica (Tgra) e telhado verde, amendoim, Arachis repens (Tame), com quatro repetições cada um; as variáveis meteorológicas foram registradas interna e externamente aos modelos. A análise térmica das coberturas foi realizada por meio de imagens termográficas e o conforto térmico das instalações foi obtido por meio dos índices de conforto, carga térmica radiante, índice de temperatura de globo negro e umidade, índice de conforto humano, índice de temperatura e umidade e temperatura efetiva. Os telhados verdes (Tame; Tgra) reduziram a temperatura da superfície interna das coberturas (5,3 e 4,4 ºC), promoveram maior atenuação da temperatura dos ambientes (1,37 e 1,35 ºC) e, consequentemente, promoveram também maior conforto térmico, em comparação com a Tfib e Trec.

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Section: Resultsunclassified

Condicionamento térmico primário de instalações rurais por meio de diferentes tipos de cobertura

Carneiro

Guiselini

Pandorfi

et al. 2015

Rev. bras. eng. agríc. ambient.

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“…Additional supplementation of vitamins and minerals has been a technique adopted to formulate feed for birds subjected to different stress situations: thermal, immunological or high stocking density. Studies have shown improved productive performance of birds supplemented with higher levels of vitamins only in a situation of heat stress (15,23,24) .…”

Section: Resultsmentioning

confidence: 99%

Supplementation of minerals and vitamins in broiler diets: effect on performance and bone quality

et al. 2021

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Differences in growth rate and carcass composition of broilers may require higher levels of vitamins and minerals with higher bioavailability. The aim of this trial was to supplement commercial diets for broilers with optimized levels of vitamins and with different mineral sources to assess the effect on performance, carcass yield and bone quality. A total of 1,800 Cobb Slow male broiler chicks were distributed into a 2 x 2 factorial completely randomized design (vitamin programs - optimized and commercial versus mineral sources - inorganic [sulfates] and carbo-amino-phospho-chelate, CAPC). The vitamin D3 metabolite, 25 (OH) D3, was included in the optimized vitamin premix. Birds and feed leftovers were weekly weighed. Data was subjected to statistical analysis using the GLM procedure of SAS software. Supplementing diets with a combination of optimized vitamin programs and CAPC as mineral source resulted in better feed conversion at 42 days of age (P<0.05). Supplementation with CAPC minerals resulted in a lower red index (*a) (P<0.05) in the adjacent thigh muscles and drumstick bones of broilers when thawed and roasted, indicating less bone porosity. The inclusion rates of mineral sources with higher bioavailability can be reduced, decreasing the negative impact of mineral excretion and the polluting effect on the environment.

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“…Average BGTHI (84.56) was measured in the experimental period comprising the application of HS (33 C/12h) in association with 65% relative humidity. Vaz et al (2009) evaluated the dietary CrMet supplementation of broiler chickens subjected to HS and observed that environments presenting BGTHI 82.9 (or higher) are stressful for 22-dayold (or older) birds. This outcome indicated that the HS applied during the 22-43 day period was enough to cause discomfort for the broilers, since it simulated thermal amplitude variations that often happen in poultry production worldwide.…”

Section: Discussionmentioning

confidence: 99%

“…Jahanian and Rasouli (2015) also observed that CrMet supplementation of 0.50 mg/kg increased BWG and improved FCR of broilers from 1 to 42 days, reared under HS. Conversely, Vaz et al (2009) and Ghazi et al (2012) conducted studies with heat-stressed broiler chickens fed diets supplemented with CrMet, without observing any effects on BWG, FI and FCR throughout the trials.…”

Section: Discussionmentioning

confidence: 99%

Dietary chromium-methionine supplementation and broiler (22–43 days) responses during heat stress. 1. Growth performance and carcass yield, metabolisable energy and serum biochemistry

et al. 2021

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Context Chromium (Cr) is considered a beneficial trace element. It has been reported that supplementation with Cr in the diet promotes improvements in the productive variables of broilers reared under heat stress (HS). Aim The study aimed to evaluate dose response of Cr as chromium-methionine (CrMet) supplementation on metabolisable energy, serum biochemistry, growth performance and carcass yield of broilers. Methods Three hundred and thirty-six 22-day-old male broiler chickens were randomly assigned to four blocks, six treatments (0, 0.10, 0.20, 0.40, 0.80 and 1.20 mg/kg dry matter (DM) Cr as CrMet), eight repetitions with seven birds per experimental unit, subjected to HS (33°C for 12h/day) from 22 to 43 days. The supplemented CrMet level for each variable studied was estimated using linear and quadratic regressions. Key results The bodyweight was quadratically affected at 35 and 43 days (P < 0.01), as well as bodyweight gain (P = 0.02) and feed conversion ratio (P = 0.01) from 22 to 43 days. A linear improvement (P = 0.03) was observed in the feed conversion ratio from 22 to 28 days and bodyweight gain for 22 to 35 days (P = 0.02). The nitrogen-corrected apparent metabolisable energy and the coefficient of metabolisation of energy were quadratically affected (P < 0.01 and P < 0.01, respectively) by CrMet levels in the diet. A quadratic response was observed on total serum cholesterol (P < 0.01), serum glucose (P = 0.07) and triacylglycerol (P < 0.01). The abdominal fat deposition was quadratically affected (P < 0.01) by CrMet levels in the diet. Conclusions The supplementation of 0.77 mg/kg DM Cr as CrMet improves performance, carcass characteristics and serum biochemistry parameters of broiler chickens reared under heat stress. Implications The results indicate that CrMet can be supplemented in the diet for broilers reared under heat stress to improve productivity of broiler chickens.

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Níveis de cromo orgânico em rações para frangos de corte mantidos sob estresse por calor no período de um a 42 dias de idade

Cited by 6 publications

References 25 publications

Condicionamento térmico primário de instalações rurais por meio de diferentes tipos de cobertura

Condicionamento térmico primário de instalações rurais por meio de diferentes tipos de cobertura

Supplementation of minerals and vitamins in broiler diets: effect on performance and bone quality

Dietary chromium-methionine supplementation and broiler (22–43 days) responses during heat stress. 1. Growth performance and carcass yield, metabolisable energy and serum biochemistry

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