Effects of ventilation of the sheep house on heat stress, growth and thyroid hormones of lambs

Koluman, Nazan; Daşkıran, İrfan

doi:10.1007/s11250-011-9811-7

Cited by 39 publications

(34 citation statements)

References 14 publications

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“…Several studies pointed out that animals decrease T 4 secretions when environmental conditions are stressful as a way of reducing endogenous heat, yet this hormone has a high thermogenic activity (Clarke et al 1997;Veríssimo et al 2009). Al-Haidary (2004), Starling et al (2005), Maurya et al (2010) and Koluman and Daskiran (2011) also found significant reductions in thyroid hormones as a response to high air temperature.…”

Section: Resultsmentioning

confidence: 93%

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

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Façanha

Costa

et al. 2017

Journal of Applied Animal Research

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Semi-arid conditions can adversely affect livestock productivity and change certain physiological parameters. The relationship between hair coat and thyroxine levels in Morada Nova ewes was evaluated through environmental factors, such as air temperature, relative air humidity, radiant and Black Globe Humidity Index to gain a better understanding of thermoregulation mechanisms in these animals. Measurements were taken from July to January in 383 Morada Nova ewes. The variables studied included rectal temperature (RT), respiratory rate (RR), coat thickness (CT), hair length (HL), hair diameter (HD), hair density (D) and thyroid hormones. The data underwent multivariate statistical analyses and a significant inverse relationship was found between coat traits and Thyroxine (T 4 ). The animals that exhibited greater HL, coat density and CT showed lower T 4 concentrations. Coat traits showed a strong interaction with physiological mechanisms and can be considered relevant in maintaining homeostasis. Hair traits play an important role in this process, since T 4 reduction was stronger in animals that showed difficulties in eliminating heat, which were the ones that had greater HL, hair density and HD. By contrast, animals with a hair coat more favourable to heat losses had higher levels of thyroid hormones. ARTICLE HISTORY

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Section: Resultsmentioning

confidence: 93%

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Leite

Façanha

Costa

et al. 2017

Journal of Applied Animal Research

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“…According to Todini (2007) the major exogenous regulator of thyroid gland activity is the environmental temperature, so an inverse relationship between ambient temperature and blood T 3 and T 4 concentrations can be expected in sheep under hot weather conditions. Lower serum levels of T 3 in hot environments can be expected due to the decisive role of T 3 and T 4 in thermogenesis, energy and proteins metabolism, as well as in metabolic responses of the animals to different nutritional and environmental changes (KOLUMAN; DASKIRAN, 2011). The fall in T 3 concentrations was greater in red ewes, compared with the white colored ones maybe can be due to the higher absorption of solar radiation.…”

Section: Discussionmentioning

confidence: 99%

“…These hormones are directly involved with metabolic rate regulation and obligatory thermogenesis, thus they have an essential role in thermoregulation and homeothermy. Koluman and Daskiran (2011) observed a reduction in the serum concentrations of thyroid hormones in sheep exposed to high temperatures, maybe to reduce the basal metabolic rate and avoiding an increase in endogenous heat production. The variation in concentrations of thyroid hormones can be high, and genetic factors may cause different responses, influencing the degree of adaptability to climatic stressors.…”

Section: Introductionmentioning

confidence: 90%

“…However, recent studies showed that other physiological parameters, such as circulating concentrations of thyroid hormones can change depending on the environmental conditions (VERÍSSIMO et al, 2009;MAURYA et al, 2010;KOLUMAN;DASKIRAN, 2011). These hormones are directly involved with metabolic rate regulation and obligatory thermogenesis, thus they have an essential role in thermoregulation and homeothermy.…”

Section: Introductionmentioning

confidence: 99%

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Thermoregulatory responses and blood parameters of locally adapted ewes under natural weather conditions of Brazilian semiarid region

et al. 2015

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The effect of the natural weather conditions on respiratory rate, rectal temperature and hematologic parameters such as glucose, total cholesterol, triacylglycerol, total protein, albumin, globulin, red blood cells, microhematocrit, mean corpuscular volume, serum triiodothyronine (T 3 ) and thyroxine (T 4 ) levels was evaluated in red (RMN) and white (WMN) coat colored Morada Nova ewes, of different class of body condition score (CBCS), during the dry (from july to december) and wet (from january to june) seasons, which exhibited different (P<0.05) air temperature, relative humidity and radiant thermal load averages. Tukey's test was used and the difference considered was to P<0.05. Significant greater averages of respiratory rate were observed in the dry period compared to the rainy period (42.26±8.96 and 36.89±8.20 breaths min -1 , respectively), mainly in the RMN (45.54±8.23 breaths min -1 ) compared with the WMN (39.27±8.57 breaths min -1 ). No differences were observed in rectal temperature measurements between the dry and the wet periods (38.59±0.58 and 38.60±0.56 o C, respectively), but the WMN had higher values than the RMN (38.77±0.54 and 38.40±0.54 o C, respectively). The glucose and total cholesterol were higher in the wet season, with no variation due to breed variety and CBCS. The triacylglycerol did not change between breed varieties and seasons. The albumin was similar between varieties and in different seasons, being different in CBCS. Total protein and globulin serum were higher during the wet season, but total protein was higher and globulin was lower in better CBCS. T 3 and T 4 levels were higher in the rainy season (0.25±0.07 and 6.74±11.37 µg dL -1 , for T 3 and T 4 , respectively) than in the dry season (0.18±0.08 and 6.31±1.64 µg dL -1 , for T 3 and T 4 , respectively). The red blood cells showed no difference, but microhematocrit was higher in WMN and in the better CBCS and mean corpuscular volume was higher in the dry season. The concentration of T 3 was lower in the RMN than in the WMN (0.19±0.07 and 0.24±0.08 µg dL -1 , respectively), while T 4 did not differ between them (6.53±1.51 and 6.52±1.46 µg dL -1 , respectively). The Morada Nova sheep showed positive physiological responses to the heat stress, notably an increase of respiratory rate and a reduction of T 3 and T 4 levels. All another hematologic parameters analyzed were within the normal range for all sheep, indicating a good ability to cope with the climatic changes of the Brazilian semiarid region. Both varieties were heat tolerant, but the red variety required major adjustments to maintain homeothermy. Key words: Adaptation, blood metabolites, blood parameters, sheep, thermoregulatory responses, thyroid hormones ResumoNeste estudo foram avaliados os efeitos da época do ano nas características fisiológicas de frequência respiratória e temperatura retal e nos parâmetros hematológicos glicose, colesterol total, triglicerídeos, proteínas totais, albumina, globulina, contagem total de hemácias, hematócrito, volume corpu...

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“…Cattle need to maintain a constant body temperature (38.8 ± 0.5 °C) in order to sustain body physiologic balance. Environmental factors such as temperature, humidity and air velocity, influence cattle thermal balance [23,24]. When beef barns are planned, all these climatic environmental factors are taken into consideration and the animal's requirements are tried to be met.…”

Section: Barn Environment Controlmentioning

confidence: 99%

Futuristic Applications for Profitable Beef Production Systems

Göncü¹,

Anitaş²,

Gökçe³

2017

JESE-A

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Abstract:The growing demands for red meats of people also present opportunities for fattening as well as improved markets for the animals. Beef production is a highly profitable venture with return of premium to the farmer. The large scale beef farming must be meet economic criteria for sustainable production. It consists of buying healthy stock, feeding and fattening them to optimum carcass weight, and selling them at any time of the year. They are handled in such a way that maximum growth is achieved at the lowest possible cost. The lifespan of operation is shorter and the return of investment is relatively higher. In beef farms which has very high genetic value of breeding animals cannot be get the expected performance without the use of technology and automation systems. Beef herd management programs if can be used as effectively, farming will have many advantages for consumer, farmer and also animals. However, to obtain these advantages from this system, required to have knowledge of the functions and effective use of the functions. The large amount of data in the obtained on many issues related to animals, herd management and an individual unless used in decisions about animals, ensuring the heavy data flow, record keeping or assessment will not give the expected results. In this study, it has been aiming that the examined the technologic applications at beef farms for sustainable and profitable meat production.

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Effects of ventilation of the sheep house on heat stress, growth and thyroid hormones of lambs

Cited by 39 publications

References 14 publications

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Thermoregulatory responses and blood parameters of locally adapted ewes under natural weather conditions of Brazilian semiarid region

Futuristic Applications for Profitable Beef Production Systems

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