Reproductive period affects water intake in heat-stressed dehydrated goats

Olsson, Kjell; Josäter-Hermelin, M.; Hossaini-Hilali, J.; Cvek, Katarina; Hydbring, E.; Dahlborn, K.

doi:10.1016/0300-9629(95)02072-1

Cited by 10 publications

(12 citation statements)

References 24 publications

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“…In goats, the rate of sweating will increase again upon drinking within a few minutes,14 which is before the concentration of antidiuretic hormone (ADH) returns to normal 18. This, along with many other reports, shows that ADH does not control sweat secretion.…”

Section: Principal Adjustments To Hot Arid Conditionsmentioning

confidence: 88%

“…During dehydration, the domestic Swedish goats increased plasma ADH concentration more rapidly during lactation than during nonlactation, mainly due to water losses via the milk. In addition, dehydrated heat‐stressed goats allowed rectal temperature to rise to higher levels when they were lactating compared to when they were dry 18,30. Nevertheless, food intake and milk flow started to fall after about 24 h of water deprivation, resulting in a 12% body weight loss in these goats.…”

Section: Lactation In the Heatmentioning

confidence: 98%

“…Pregnant ewes29 and goats18 drank in excess during heat stress, particularly when the water was warm (35°C). The reason for the excessive drinking is not known, but a lack of the normal inhibitory signals from the oropharyngeal tract appears to occur and may be related to the lack of cooling effect of the warm water.…”

Section: Pregnancy In the Heatmentioning

confidence: 99%

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Fluid Balance in Ruminants: Adaptation to External and Internal Challenges

Olsson

2005

Annals of the New York Academy of Sciences

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Ruminants are widespread in hot, arid regions. This demands adaptation to large circadian temperature fluctuations and recurrent periods of food and water shortage. Pregnancy and lactation add to the demands on the adaptive mechanisms due to the greater need for food, water, and electrolytes. The blood volume increases to meet the requirements of the fetoplacental unit and the mammary glands. Unlike urine, the milk cannot be concentrated by antidiuretic hormone (vasopressin). During water deprivation, lactating animals therefore become dehydrated more rapidly than nonlactating animals. Nevertheless, desert-adapted lactating ruminants endure frequent periods of water deprivation without incurring bad health. For the offspring living in hot and dry conditions, it is an advantage that the milk is not concentrated, even if the mother has a high antidiuretic hormone concentration to enable her to concentrate the urine. Since ruminants are prey, they need to drink rapidly when they get access to water. The forestomach allows the animals to store water in the reticulorumen. There is no danger of water intoxication even if they drink to satisfaction in a couple of minutes after having lost as much as 30% of their body weight.

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Section: Principal Adjustments To Hot Arid Conditionsmentioning

confidence: 88%

Section: Lactation In the Heatmentioning

confidence: 98%

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Fluid Balance in Ruminants: Adaptation to External and Internal Challenges

Olsson

2005

Annals of the New York Academy of Sciences

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“…The majority of research has been on single acute stressors, either approached through experimental laboratory studies or, in a few cases, through nonexperimental evaluation of acute natural stressors in the field. In experimental laboratory studies, researchers have usually created such stressors by exposing animals to various single environmental stressors for short period: extreme heat (Larsson et al, 1983;Lowe et al, 2002;Olsson et al, 1995Olsson et al, , 1996; review by Silanikove, 2000); cold temperatures (DeVries et al, 1997;Filipovic, 2007); food or water deprivation (Astheimer et al, 1992;Dunlap, 1995;Li et al, 2000;Lynn et al, 2003;Tsuma et al, 1996; see also review by Harvey et al, 1984). A few experiments have used a combination of two acute stressors simultaneously, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…A few experiments have used a combination of two acute stressors simultaneously, e.g. heat stress in either food deprived animals (Olsson et al, 1995) or in water deprived animals (Lowe et al, 2002;Olsson et al, 1996, see also review by Silanikove, 2000).…”

Section: Introductionmentioning

confidence: 99%

Coping with a challenging environment: Effects of seasonal variability and reproductive status on glucocorticoid concentrations of female baboons (Papio cynocephalus)

Gesquiere

Khan

Shek

et al. 2008

Hormones and Behavior

107

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Environmental stressors impact physiology and behavior in many species of animals. These effects are partly mediated through changing concentrations of glucocorticoids, which also vary with reproductive state and social conditions. Prior research has focused largely on seasonal breeders, but the close temporal linkage between season and reproductive state in these species hinders ability to disentangle environmental effects from those of the animal's reproductive status. Here we assessed the effects of environmental challenges on the fecal glucocorticoid (fGC) levels of non-seasonal breeders, female baboons (Papio cynocephalus) of Amboseli, Kenya. Amboseli is characterized by a long dry season, during which food and water become scarce, and by extreme temperatures above 40°C in the shade during some months of the year. We found that after accounting for female reproductive status and individual variability, females exhibited higher fGC levels during the dry season than during the wet season. Further, during the wet season, fGC levels were higher in months of high average daily maximum temperatures. During the dry season, fGC levels were elevated both in hotter months and in months during which the baboons spent a relatively high proportion of time feeding. In spite of these stressors, female baboons reproduce during all months of the year in Amboseli, unlike most other mammals in this environment. This may be attributable to their extreme adaptability, specifically their diversified diet, and their ability to modify their behavior, including their activity profiles.

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