&lt;b&gt;Heat stress and vitamin E in diets for broilers as a mitigating measure

Dalólio, Felipe Santos; Albino, Luiz Fernando Teixeira; Lima, Heder José D’Ávila; Silva, Jadir Nogueira da; Moreira, Joerley

doi:10.4025/actascianimsci.v37i4.27456

Cited by 19 publications

(20 citation statements)

References 52 publications

(57 reference statements)

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“…The absence of variation in the surface temperature can be justified by the fact that this variable was measured on the back of the broilers. Despite the trend that occurs in warm environmentsto the increase in the surface temperature of broilers by the rise in the peripheral blood circulation in an attempt to dissipate endogenous heat through sensitive processes, this occurs more strongly only in tissues not covered by feathers such as feet, crest and wattles (DALÓLIO et al, 2015). Measurement of the physiological variables only once in each experimental week may have contributed to the absence of the effect.…”

Section: Resultsmentioning

confidence: 99%

Effect of roof painting of aviaries on thermal comfort, productive performance and physiological variables of broilers chickens

Valadares

Moreira

Dalólio

et al. 2018

Rev. bras. saúde prod. anim.

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SUMMARY The objective this study was to evaluate the thermal comfort, performance and the physiological variables of 21-42 day of age broiler chickens housed in aviaries with painted and not painted fiber cement roof. A completely randomized design was used in a split-plot design where the plots were composed of the sheds (painted and not painted roof) and the subplots were the evaluation hours (6h00, 9h00, 12h00, 15h00 and 18h00) for a 22-day data collection, considered as the replicates. It was observed that the external painting in white of the roof provided improvements inside the shed for airtemperature (Ta), roof temperature (Tr) and the thermal load of radiation (TLR). The relative humidity (RH) and the Globe-Temperature-Humidity-Index (GTHI) varied only according to the collection times. The exterior painting of the roof had no effect on the physiological variables of the broilers. Productivity performance indexes and financial compensation per lot were better for the roof painted shed. As a result, fiber cement roof painted in white is recommended in aviaries located in hot climates, such as the region in this study.

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Section: Resultsmentioning

confidence: 99%

Effect of roof painting of aviaries on thermal comfort, productive performance and physiological variables of broilers chickens

Valadares

Moreira

Dalólio

et al. 2018

Rev. bras. saúde prod. anim.

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“…Vitamin E (alpha-tocopherol) is a fat-soluble vitamin that has antioxidant activity and helps to scavenge free radicals produced inside the cell. Vitamin E is found to modulate inflammatory signaling, regulate the production of prostaglandins, cytokines, and leukotrienes, and also improve the phagocytic activity of macrophages in broiler chickens [ 57 ]. Furthermore, Vitamin E also helps to improve immunity by inducing proliferation of lymphocytes [ 58 , 59 ].…”

Section: Potential Strategies To Mitigate Heat Stress In Poultrymentioning

confidence: 99%

Impact of Heat Stress on Poultry Health and Performances, and Potential Mitigation Strategies

Wasti

Sah

Mishra

2020

Animals

213

222

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Heat stress is one of the major environmental stressors in the poultry industry resulting in substantial economic loss. Heat stress causes several physiological changes, such as oxidative stress, acid-base imbalance, and suppressed immunocompetence, which leads to increased mortality and reduced feed efficiency, body weight, feed intake, and egg production, and also affects meat and egg quality. Several strategies, with a variable degree of effectiveness, have been implemented to attenuate heat stress in poultry. Nutritional strategies, such as restricting the feed, wet or dual feeding, adding fat in diets, supplementing vitamins, minerals, osmolytes, and phytochemicals, have been widely studied and found to reduce the deleterious effects of heat stress. Furthermore, the use of naked neck (Na) and frizzle (F) genes in certain breed lines have also gained massive attention in recent times. However, only a few of these strategies have been widely used in the poultry industry. Therefore, developing heat-tolerant breed lines along with proper management and nutritional approach needs to be considered for solving this problem. Thus, this review highlights the scientific evidence regarding the effects of heat stress on poultry health and performances, and potential mitigation strategies against heat stress in broiler chickens and laying hens.

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“…Vitamin E is the generic name given to eight tocopherol and tocotrienol compounds: alpha (α), beta (β), gamma (γ) and delta (δ) tocopherol or tocotrienol. All are considered natural antioxidants, found in variable fractions in oils, eggs, liver, wheat and some dark green vegetables (Dalólio, Albino, Lima, da Silva, & Moreira, 2015). The main difference in the structures of these compounds is the number of side chain bonds, which result in changes in the activity of the vitamin.…”

Section: Introductionmentioning

confidence: 99%

Performance and meat quality of broilers fed different levels of alpha-tocopherol

Bezerra¹,

Vaz²,

Silva³

et al. 2021

Semina: Ciênc. Agrár.

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This study aimed to evaluate the performance and meat quality of broilers fed different levels of alpha-tocopherol. A total of 240 one-day-old Cobb 500® male broiler chicks were reared until day 7 of life, as recommended by the commercial line, and were fed at only 50% of the alpha-tocopherol requirement. At day 8, the chicks were weighed, homogenized, and allotted in a completely randomized design with four treatments (50, 100, 150, and 200% alpha-tocopherol requirement) and six replicates of ten chickens per experimental unit. Several variables were evaluated: weight gain, feed intake, feed conversion, carcass yield and prime cuts (drumstick, thigh, and breast), edible viscera (heart, liver, gizzard), immune organs (cloacal bursa and spleen), intestine weight and length, abdominal fat, breast meat color (lightness, redness, and yellowness), pH, cooking loss, and shear force of the breast meat. Dietary alpha-tocopherol levels did not influence broiler performance, carcass yield, and prime cuts at 42 days of age. The edible viscera, immune organs, the length of the small intestine, and the abdominal fat, as well as the meat color (lightness, redness, and yellowness), pH, cooking loss, and shear force of the breast meat, were not influenced. However, the small intestine yield increased linearly with increasing levels of alpha-tocopherol. The dietary levels of alphatocopherol did not influence the performance and meat quality of broilers from 8 to 42 days of age.

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<b>Heat stress and vitamin E in diets for broilers as a mitigating measure

Cited by 19 publications

References 52 publications

Effect of roof painting of aviaries on thermal comfort, productive performance and physiological variables of broilers chickens

Effect of roof painting of aviaries on thermal comfort, productive performance and physiological variables of broilers chickens

Impact of Heat Stress on Poultry Health and Performances, and Potential Mitigation Strategies

Performance and meat quality of broilers fed different levels of alpha-tocopherol

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