Heat Stress and Animal Productivity

Aggarwal, Anjali; Upadhyay, R. C.

doi:10.1007/978-81-322-0879-2

Cited by 71 publications

(75 citation statements)

References 425 publications

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“…The results corroborate with Aggarwal and Upadhyay (2012) that suggested initial reactions of the animal to acute heat stress are related more to the behavior (emotional) than thermoregulatory mechanisms.…”

Section: Rectal Temperature and Respiratory Ratesupporting

confidence: 81%

Feeding management strategy for sheep in feedlot in hot and humid region

Chagas¹,

Ferreira²,

Azevedo³

et al. 2015

Biosci. J.

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ABSTRACT:This study aimed to evaluate the effect of different feeding schedules on the ingestive behavior, dry matter (DM) intake, neutral detergent fiber intake (NDF), respiratory rate (RR) and rectal temperature (RT) of Santa Ines sheep, in feedlot in hot and humid climate region. Five non-castrated male sheep with an initial average weight of 27 ± 3 kg were distributed in a 5x5 Latin Square experimental design. Feed was offered twice daily, the first meal at 7:00h for all treatments, and the second meal, was offered at: 13:30h, 15:00h, 16:30h, 18:00h, or 19:30h. The RR and RT were measured thrice (morning, afternoon and evening) in a day. The feeding behavior (time of eating, rumination and idleness) was recorded in minutes for period of 24 hours visually. The environmental conditions (air temperature and humidity) was measured to determine the thermal comfort index, THI (Temperature-Humidity Index), which ranged between 72 and 83. There was no evidence that different afternoon feeding times affected rectal temperature during the morning (38.9°C), afternoon (39.0°C) or evening (39.0°C). The respiratory rate during the afternoon was higher for animals fed at 15:00h (55.2 mov.min -1 ) than for animals fed at 18:00h or 19:30h (29.6 and 31.6 mov.min -1 , respectively).

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Section: Rectal Temperature and Respiratory Ratesupporting

confidence: 81%

Feeding management strategy for sheep in feedlot in hot and humid region

Chagas¹,

Ferreira²,

Azevedo³

et al. 2015

Biosci. J.

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“…Our data also revealed that the lower concentration of thyroid hormones confirms that cows were in heat stress. Adaptation to high temperatures results in an increased body temperature and a decreased thyroid activity [25,26].…”

Section: Discussionmentioning

confidence: 99%

Assessment of optimum thermal humidity index for crossbred dairy cows in Dehradun district, Uttarakhand, India

Kohli¹,

Atheya²,

Thapliyal³

2014

Vet World

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“…It is already known that the livestock production process can produce a stressful environment for the animals (Dantzer & Mormede 1983), whereby animals are subjected to a multitude of stressful stimuli (Aggarwal & Upadhyay 2013). Although production animals (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Sheep are prey animals and their natural response to stress is to mask any obvious behavioural signs to avoid predation (Stubsjøen et al 2015). This makes prolonged or chronic stress difficult to detect in sheep farming practices (Aggarwal & Upadhyay 2013).…”

Section: Introductionmentioning

confidence: 99%

Influences of the stress endocrine system on the reproductive endocrine axis in sheep (Ovis aries)

Narayan

Parisella

2017

Italian Journal of Animal Science

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The hypothalamic-pituitary-adrenal (HPA) axis and the hypothalamic-pituitary-gonadal (HPG) axis systems are inversely related in humans and animals. Although livestock animals, such as sheep (Ovis aries), tend to be well adapted to their environment, it is known that the livestock production processes subject animals to a multitude of physical and psychological stressful stimuli that have the potential to elevate the HPA axis activity. Chronic stress is one of the major challenges in sheep production, as it is difficult to detect and can result in prolonged dysfunction of the HPA axis, causing downstream negative physiological effects such as immunosuppression, increased susceptibility to disease and reproductive dysfunction. The elevation of HPA axis activity during chronic stress has been suggested as the primary neuroendocrine mechanism underlying the aetiology of reproductive dysfunction in sheep. Research in sheep has demonstrated that glucocorticoids act on the HPG axis at the level of the hypothalamus and hypophyseal portal system to decrease gonadotrophin secretion and at the level of the pituitary gland to reduce responsiveness and sensitivity of gonadotroph cells and their receptors to GnRH. Sheep farming enterprises rely on the breeding efficacy of ewes to optimise lambing percentage and reproductive success in order to ensure a profitable business. This review discusses the influences of the HPA axis on the HPG axis and defines any significant reproductive function consequences caused by stress in ewes and places them into perspective for sheep management and productivity.ARTICLE HISTORY

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Heat Stress and Animal Productivity

Cited by 71 publications

References 425 publications

Feeding management strategy for sheep in feedlot in hot and humid region

Feeding management strategy for sheep in feedlot in hot and humid region

Assessment of optimum thermal humidity index for crossbred dairy cows in Dehradun district, Uttarakhand, India

Influences of the stress endocrine system on the reproductive endocrine axis in sheep (Ovis aries)

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