Effect of the environment and diet on the physiological variables of sheep in the Brazilian semi-arid region

Dantas, Nayanne Lopes Batista; Souza, Bonifácio Benício de; Silva, Maycon Rodrigues da; Silva, Gustavo de Assis; Pires, João Paulo da Silva; Batista, Luanna Figueirêdo; Souza, Mateus Freitas de; Furtado, Dermeval Araújo

doi:10.5433/1679-0359.2019v40n2p971

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…For the estimation of animal heat tolerance, RT and RF are the best physiological variables. However, the assessment of adaptability can be complemented with variables such as heart rate and surface temperature [5]. It has also been observed that thermographic evaluation surveys in sheep can adequately assess temperature gradients and identify breeds that have better heat tolerance [10].…”

Section: Table II Differences In Meteorological Parameters Between Morning and Afternoon In Both Groupsmentioning

confidence: 99%

Physiological response to thermal stress in hair-sheep ewes during subtropical summer

et al. 2021

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With the aim to assess the effect of short-term thermal stress on physiological traits of ewes an experiment was designed. Fourteen hair sheep ewes were selected during early reproductive management and randomly segregated in two groups. Control group (CG) with indoor conditions, and an experimental group (EG) under continuous outdoor conditions without shadow accessing during 14 days (d). Respiratory frequency (RF), rectal temperature (RT) and infrared image temperatures were estimated. Traits were measured for 8 d twice a d (9:00 am and 15:00 pm). Environmental temperature and humidity were monitored, and temperature and humidity index was estimated. All physiological and environmental traits showed significantly variation by group and time of measurement (P < 0.001). RT and RF were significantly higher for EG and during pm measurements. Environmental conditions indicated thermal stress conditions for outdoor EG during the afternoon was related ultimately with respiratory mechanism as the main indicator of continuous thermal stress. Head infrared image temperature was a good predictor of body temperature.

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Section: Table II Differences In Meteorological Parameters Between Morning and Afternoon In Both Groupsmentioning

confidence: 99%

Physiological response to thermal stress in hair-sheep ewes during subtropical summer

et al. 2021

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“…This derives from a combination of changes in core body temperature and changes in blood flow at the body surface (Idris et al, 2021). Katahdin ewes, such as Somali hair sheep, predominantly exhibit white pelage, resulting in greater reflectivity and reduced heat absorption through the skin (Dantas et al, 2019). Because of this greater luminosity and reflectance characteristic, white animals can be better adapted to heat (Paim et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Physiological response of Katahdin ewes to the absence of shadows in tropical region of Mexico

Gómez Guzmán,

Armijo,

Rivera

et al. 2024

J. Anim. Behav. Biometeorol.

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This study evaluated the effect of environmental conditions on the physiological and body infrared temperature traits of Katahdin sheep. Ten recently reproductive-managed ewes were randomly segregated into two groups. The control group (CG) was under outdoor conditions with shadow access, and the experimental group (EG) was under outdoor conditions without shadow access. Traits were measured for 16 days, and the environmental traits confirmed significant differences between groups, with an average temperature-humidity index (THI) of 68.64±1.46 for the CG and 72.98±3.17 for the EG, with a breach of five units between groups. The THI was subsequently used to evaluate the heat load. Respiratory frequency was the physiological variable that responded the most to heat stress. The rectal temperature of the sheep was greater in the experimental group than in the control group, indicating an increase in heat stress. The EG also presented higher heat emissions from body regions, which was associated with changes in core body temperature and blood flow at the body surface. Differences in hematological parameters, such as the erythrocyte count, mean corpuscular volume, and total plasma protein concentration, were found between the groups. Infrared thermography was found to be efficient for estimating heat stress in sheep species, and head temperature was found to be a reliable indicator of physiological thermal stress.

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“…In addition, Dorper sheep have coat characteristics that favor less thermal insulation and greater resistance to solar radiation. Dantas et al (2020) mention that there is a high correlation between environmental indices and body temperature of sheep, demonstrating the importance of establishing indicative values of thermal discomfort for the adoption of measures that mitigate thermal stress and do not compromise the leather of Dorper sheep.…”

Section: Discussionmentioning

confidence: 99%

Histological and physical–mechanical characteristics of the skin of Dorper sheep related to residual feed intake and the confinement environment

Matos

Menezes

Góis

et al. 2022

Trop Anim Health Prod

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The aim was to evaluate the effect of residual feed intake (RFI) on the histological, physical and mechanical characteristics of the sheep skin confined in full sun or shade. Dorper sheep (n = 64), male, with an initial bodyweight of 17.8 ± 2.43 kg was confined for 40 days to determine the RFI. After classification, 30 animals with positive RFI and 30 animals with negative RFI were selected, which were distributed in 2 confinement environments. This was a factorial arrangement of 2 (groups of animalspositive RFI and negative RFI) × 2 (environments-full sun and shade), with 15 animals for each combination of factors. The sheep remained in confinement for 60 days. After slaughter, skins were divided in half, and fragments were collected from the right portion for histological sections. The left part of each skin was subjected to tanning. Interaction effect RFI × environment was found in the evaluation of leather fragments in the horizontal direction on elongation at break, leather thickness and tear strength (p < 0.05). An isolated effect of the environment was found on elongation at break of leather fragments in the evaluation on the vertical direction (p = 0.01) and on the number of secondary follicles during the histological evaluation of the dorsal and lateral regions of the skin (p < 0.05). An effect of the interaction RFI × environment was observed for the thermostatic layer of the hip region (p = 0.03). Sheep with positive RFI and kept in confinement in full sun have a leather with greater elongation at break and tear strength, important aspects in determining the quality of the product by the leather industry.

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Effect of the environment and diet on the physiological variables of sheep in the Brazilian semi-arid region

Cited by 6 publications

References 14 publications

Physiological response to thermal stress in hair-sheep ewes during subtropical summer

Physiological response to thermal stress in hair-sheep ewes during subtropical summer

Physiological response of Katahdin ewes to the absence of shadows in tropical region of Mexico

Histological and physical–mechanical characteristics of the skin of Dorper sheep related to residual feed intake and the confinement environment

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