Pupillary dilation as a thermal stress indicator in boer crossbred goats maintained in a climate chamber

Marques, Jordânio Inácio; Neto, José Pinheiro Lopes; Nascimento, José Wallace Barbosa do; Talieri, Ivia Carmem; Medeiros, Geovergue Rodrigues de; Furtado, Dermeval Araújo

doi:10.1016/j.smallrumres.2017.11.013

Cited by 10 publications

(14 citation statements)

References 7 publications

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“…As suggested by Lopes and Marques et al (2018), at each stage of study in the climatic chamber, the animals were submitted to a cycle of 8/16 h (experimental air temperature / ambient air temperature). The chamber was turned on each day at 7 a.m., allowing 1 h to stabilize the air temperature and internal relative humidity.…”

Section: Methodsmentioning

confidence: 99%

“…Six male crossbred goats (¾ Boer breed and ¼ no de ned racial pattern) were selected from breeding herds suitable for meat production, with an average weight of 25.06 ± 4.43 kg and mean age of six months. The animals were housed in metal stalls with dimensions of 1.15 × 0.50 × 0.84 m in length, width and height, respectively, as detailed by Marques et al (2018).…”

Section: Animals and Housingmentioning

confidence: 99%

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Estimation of Rectal Temperature of Goats Based on Surface Temperature

Marques

Leite

Neto

et al. 2021

Preprint

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Infrared thermography (IR) is a non-invasive tool with potential to indicate changes in the animal's thermal conditions in response to the thermally stressful environment. The objective of this study was to evaluate the application of IR to estimate the rectal temperature of crossbred goats of the Boer breed. Six male crossbred goats of the Boer breed were distributed in a completely randomized design and submitted to temperatures of 26, 30 and 34 °C and 68% relative humidity. Rectal temperature (RT) and thermograms data were collected from animals at each air temperature (AT) evaluated. In the thermograms, the temperatures of the ocular globe (PT), head (HT), shoulder (ST), hindquarter (HQ) and maximum infrared (IRMax) temperatures of the animals' surfaces were collected. The correlation of PT, HT, ST, HQ and IRMax data with RT was evaluated through the Pearson coefficient analysis and the concordance using Bland-Altman diagrams. With the exception of the IRMax surface temperature, the others were adequate for the accurate estimation of RT, with PT standing out for presenting the highest correlation coefficient with RT (r = 0.951) and estimation errors varying in the range of ± 0.27 °C.

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Section: Methodsmentioning

confidence: 99%

Section: Animals and Housingmentioning

confidence: 99%

Estimation of Rectal Temperature of Goats Based on Surface Temperature

Marques

Leite

Neto

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…As suggested by Lopes Neto et al (2018) and Marques et al (2018), at each stage of study in the climatic chamber, the animals were submitted to a cycle of 8/16 h (experimental air temperature / ambient air temperature). The chamber was turned on each day at 7 a.m., allowing 1 h to stabilize the air temperature and internal relative humidity.…”

Section: Methodsmentioning

confidence: 99%

“…Animal feed and water were provided ad libitum. The feed supplied to the animals consisted of Tifton hay (Cynodon dactylon (L) Pers), which was 43.0% of the total volume of the feed, as well as corn meal (26.6%), molasses (2.5%) soybean oil (2.0%), mineral salt (1.5%) and calcitic limestone (0.4%), according to the composition indicated by NRC (2007) and adopted by Marques et al (2018).…”

Section: Methodsmentioning

confidence: 99%

Estimation of Rectal Temperature of Goats Based on Surface Temperature

et al. 2021

View full text Add to dashboard Cite

Infrared thermography (IR) is a non-invasive tool with potential to indicate changes in the animal's thermal conditions in response to the thermally stressful environment. The objective of this study was to evaluate the application of IR to estimate the rectal temperature of crossbred goats of the Boer breed. Six male crossbred goats of the Boer breed were distributed in a completely randomized design and submitted to temperatures of 26, 30 and 34 °C. Rectal temperature (RT) and thermograms data were collected from animals at each air temperature evaluated. In the thermograms, the temperatures of the ocular globe (PT), head (HT), shoulder (ST), hindquarter (HQ) and maximum infrared (IRMax) of the animals' surfaces were collected, the latter being observed in the lower region of the animals' eyes, at all air temperatures evaluated. The correlation of PT, HT, ST, HQ and IRMax data with the RT was evaluated through the Pearson coefficient analysis and the concordance using Bland-Altman diagrams. With the exception of the IRMax surface temperature, the others were adequate for the accurate estimation of RT, with PT standing out for presenting the highest correlation coefficient with RT (r = 0.951) and estimation errors varying in the range of ± 0.27 °C.

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“…The greater heat tolerance is related to physiological particularities and adaptability of farm animals (Habibu et al, 2016), the higher heat tolerance, the greater the possibility of achieving the most productive index, since the maintenance of body temperature outside the thermal comfort zone requires energy expenditure, due to the physiological and behavioral effects performed to ensure the survival of the animals (Marques et al, 2018;Machado et al, 2019). Several strategies can be used to minimize the thermal discomfort of these animals, one of them is the use of foods in the diet that offer energy with low caloric increment, that is, diets in which the amount of oil of the rations is modified (Menten & Pedroso, 2001;Machado et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Breeding Densities and Inclusion of Soybean Oil on Performance, Carcass Trait and Heat Loss in Meat Quails

Lima¹,

Filho²,

Freitas³

et al. 2019

JAS

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Quails are homeothermic animals, in countries with a tropical climate, such as Brazil, birds face great difficulties in controlling body temperature inside the sheds. Several practices are being studied in order to keep these animals within the thermal comfort zone, and thus, to minimize the effects of thermal stress, partial substitution of carbohydrates by oils and changes in density are some of them. The objective of this study was to evaluate the different breeding densities and inclusion levels of soybean oil in performance, carcass characteristics and heat loss in quail. 450 quails, seven days old, distributed in a completely randomized design in a 3 × 2 factorial scheme, two densities (215.6 cm2 bird-1 and 188.6 cm2 bird-1) and three inclusion levels of soybean oil (0, 2, 4%) were used, totaling six treatments with five replicates each. The heat loss by radiation was estimated with the aid of infrared thermography. The results showed that there was an effect of the density on feed consumption, which was lower for birds raised in the density of 188.6 cm2 bird-1 (783.78 g of feed), but without its effect on weight gain and food conversion. No effect of inclusion levels of soybean oil was observed on any performance variables. There was no statistical difference (P > 0.05) between treatments for any variables of carcass yield and parts, and heat loss by radiation analyzed. Therefore, it is concluded that soybean oil inclusion levels do not affect the performance and yield of quails, nor do they influence the loss of heat throughout the life cycle of these animals. The birds raised in the density of 188.6 cm2 bird-1 obtained the lowest average dietary intake, with no impact on weight gain and feed conversion, allowing the creation of a greater number of birds per box.

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Pupillary dilation as a thermal stress indicator in boer crossbred goats maintained in a climate chamber

Cited by 10 publications

References 7 publications

Estimation of Rectal Temperature of Goats Based on Surface Temperature

Estimation of Rectal Temperature of Goats Based on Surface Temperature

Estimation of Rectal Temperature of Goats Based on Surface Temperature

Effect of Different Breeding Densities and Inclusion of Soybean Oil on Performance, Carcass Trait and Heat Loss in Meat Quails

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