Efeito da temperatura ambiente e do empenamento sobre o desempenho de frangas leves e semipesadas

Fukayama, Ellen Hatsumi; Sakomura, Nilva Kazue; Neme, Rafael; Freitas, Ednardo Rodrigues

doi:10.1590/s1413-70542005000600023

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…According to Nascimento et al (2011), heat loss is related to specific feather coverage in each body part. Fukayama et al (2005) also reported that feather coverage in specific places may provide an extension of the heat loss surface, improving the thermal comfort range of the birds and allowing for some strains to better adapt to temperature ranges rather than others. In this sense, Yahav et al (1998) reported better adaptation to tropical climates by chickens without feathers in the neck, precisely due to this extra heat dissipating region on the neck.…”

Section: Resultsmentioning

confidence: 99%

Thermal Response of Three Strains of Hens Housed in a Cage-Free Aviary at the Amazon Rainforest

Rufino

Martorano

Cruz

et al. 2021

Braz. J. Poult. Sci.

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This study aimed to evaluate the thermal response of three strains of hens housed in a cage-free system at the Amazon rainforest in order to evaluate how feather coverage influences thermal exchange with the environment. The experimental method was completely randomized and treatments comprised three strains of hens (Rhode Island Red (red feathers with feathers on the neck), alternative strain FCI (red feathers without feathers on the neck), and alternative strain FCIII (white feathers without feathers on the neck)), with 20 hens (replicates) analyzed per strain. Thermal images of each bird were captured in order to record the birds' surface temperatures on five points in five targets. All data collected in this study were subjected to ANOVA and subsequently to the Tukey test at p≤0.01 and p≤0.05. The aviary's left wall presented a lower average temperature, indicating lower heat accumulation, while the floor presented higher heat accumulation. FCIII hens (white feathers) presented higher (p<0.05) heat accumulation on the head and legs, and lower (p<0.05) heat accumulation on the neck and back in relation to other analyzed hens, indicating increased heat exchange efficiency and high concentration of this process in specific body areas. FCI and FCIII hens (without feathers on the neck) presented lower (p<0.05) heat accumulation on the neck and higher (p<0.05) heat accumulation on the head and legs, indicating that the feather coverage directly influenced heat exchange mechanisms, and an increased area without feathers provided great heat exchange zones for birds in a tropical climate.

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Section: Resultsmentioning

confidence: 99%

Thermal Response of Three Strains of Hens Housed in a Cage-Free Aviary at the Amazon Rainforest

Rufino

Martorano

Cruz

et al. 2021

Braz. J. Poult. Sci.

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“…Live performance is impaired when birds are reared at temperatures above their comfort zone due to reduced feed intake because dietary energy is used to maintain constant body temperature, instead of converting feed into meat (Fukayama et al, 2005;Laganá et al, 2007). Zhou & Yamamoto (1997) found that broiler body temperature increased three degrees Celsius (41 -44 ºC), and skin temperature increased 6 °C (37-43 ºC) when exposed to heat stress (36 °C) for three hours.…”

Section: Introductionmentioning

confidence: 99%

Assessment of broiler surface temperature variation when exposed to different air temperatures

Nascimento

Nääs

Pereira

et al. 2011

Rev. Bras. Cienc. Avic.

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This study was conducted to determine the effect of the air temperature variation on the mean surface temperature (MST) of 7-to 35-day-old broiler chickens using infrared thermometry to estimate MST, and to study surface temperature variation of the wings, head, legs, back and comb as affected by air temperature and broiler age. One hundred Cobb ® broilers were used in the experiment. Starting on day 7, 10 birds were weekly selected at random, housed in an environmental chamber and reared under three distinct temperatures (18, 25 and 32 ºC) to record their thermal profile using an infrared thermal camera. The recorded images were processed to estimate MST by selecting the whole area of the bird within the picture and comparing it with the values obtained using selected equations in literature, and to record the surface temperatures of the body parts. The MST estimated by infrared images were not statistically different (p > 0.05) from the values obtained by the equations. MST values significantly increased (p < 0.05) when the air temperature increased, but were not affected by bird age. However, age influenced the difference between MST and air temperature, which was highest on day 14. The technique of infrared thermal image analysis was useful to estimate the mean surface temperature of broiler chickens.

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“…According to Macari et al (2004) and Abreu et al (2007), the ideal room temperature to provide thermal comfort for broiler chickens should be 30-32 o C in first week of age, [28][29][30] o C in the second week, 26-27 o C in the third week, [23][24][25][26] o C in the fourth week, 20-23 o C in the fifth week, and 20 o C in the sixth and seventh weeks. Some studies have demonstrated that nakedneck broiler chickens have a higher resistance to high temperatures, because they are able to dissipate more heat in function of a reduction of up to 40% in the number of feathers and, therefore, should be chosen for hot climates (Silva et al, 2001;Fukayama et al, 2005).…”

Section: Resultsmentioning

confidence: 99%

Digestible Lysine on Live Performance of Chicken Type Naked Neck During the Starter Phase

Oliveira

Pinheiro

Castro

et al. 2015

Rev. Bras. Cienc. Avic.

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The poultry market has changed due to a higher consumer interest on products with differentiated organoleptic characteristics, making of free-range broiler production a promising activity. This experiment was conducted to determine the digestible lysine requirements of Redbro Cou Nu male and female chickens during the starter phase (one to 21 days of age). Six hundred and thirty Redbro Cou Nu broilers were distributed into 30 pens (21 chickens/pen) according to a randomized complete design in a 5 x 2 factorial arrangement, consisting of five levels of digestible lysine and two sexes, with three replicates (pens) per treatments. Diets with increasing digestible lysine levels (8.1, 9.5, 10.9, 12.3 and 13.7 g of digestible lysine per kg of diet) were offered ad libitum. The following performance traits were evaluated at the end of the experiment (d 21): feed intake, lysine intake, body weight gain, and feed conversion ratio. No interaction between dietary lysine level and sex was observed for the evaluated traits. The effect of sex was only detected on body weight gain, while effects of dietary lysine level were only detected on the feed intake. Males presented higher body weight gain than females. Lysine intake and body weight gain increased, and feed conversion ratio decreased as the level of dietary lysine increased. The best feed conversion ratio was obtained when birds were fed 12.95 g of digestible lysine per kg of diet.

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Efeito da temperatura ambiente e do empenamento sobre o desempenho de frangas leves e semipesadas

Cited by 5 publications

References 5 publications

Thermal Response of Three Strains of Hens Housed in a Cage-Free Aviary at the Amazon Rainforest

Thermal Response of Three Strains of Hens Housed in a Cage-Free Aviary at the Amazon Rainforest

Assessment of broiler surface temperature variation when exposed to different air temperatures

Digestible Lysine on Live Performance of Chicken Type Naked Neck During the Starter Phase

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