Physiological responses to water restriction in dry and lactating Awassi ewes

Hamadeh, S.K.; Rawda, N.; Jaber, Lina; Habre, Adele Najem; Said, Mounir Abi; Barbour, Elie K.

doi:10.1016/j.livprodsci.2005.09.016

Cited by 49 publications

(92 citation statements)

References 24 publications

(49 reference statements)

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“…The same results were reported by other authors (Li et al 2000;Ghanem 2005;Hamadeh et al 2006) in experiments conducted on sheep after water restriction.…”

Section: Discussionsupporting

confidence: 90%

“…This has also been reported by Hamadeh et al (2006) in Awassi sheep. In particular, the progressive increase in RBC, in response to water restriction, leads to secondary polycythaemia due to a gradual reduction in circulating blood volume and not due to an increase in red blood cells.…”

Section: Discussionsupporting

confidence: 86%

“…Osbaldiston (1971) reported that hypovolaemia due to water insufficiency is expected to cause a decrease in renal blood flow, thus leading to a decreased filtration rate; in fact, 95% of creatinine, the final metabolite of creatine, is of muscular origin and it is excreted by the kidneys in proportion to the muscle mass and to its rate of proteolysis. When kidney water stress leading to slower glomerular filtration and reabsorption of urea excretion affects kidney excretion function (Keenan and Allardyce 1986;Igbokwe 1993;Silanikove 2000;Marini et al 2004;Kataria and Kataria 2007), the blood creatinine levels increase, as noted in similar experiments on sheep (Alamer 2005;Hamadeh et al 2006). Laden et al (1987) reported an increased creatinine value of 88% in five days water-restricted Awassi sheep, while Abd El-latif et al (1997) reported an increase of 13% in blood levels of creatinine after three days of water restriction in Barki sheep.…”

Section: Discussionmentioning

confidence: 86%

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The effect of water-restriction on various physiological variables in intensively reared Lacaune ewes

Casamassima¹,

Vizzarri²,

Nardoia³

et al. 2016

Vet. Med. - Czech

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ABSTRACT:The effects of water restriction on rectal temperature, respiratory rate and selected blood variables in intensively reared Lacaune ewes were evaluated. The tests were carried out over the course of 28 days in spring on 30 lactating sheep divided into three groups of 10 animals each, matched by lactation status and body weight and allocated into individual boxes. The animal groups were as follows: control group W100 with drinking water for the whole day (24 h/24 h), while the two experimental groups each received 80% (W80 group) and 60% (W60 group) of the water ration of the control group, respectively. The feed, in according with physiological and production needs of the animals, was administered in three daily meals (08:00, 14:00 and 20:00 h). Water intake was recorded three times per day (at 08:00, 14:00 and 20:00 h) and the daily feed intake at 08:00 h, while the rectal temperature, respiratory rate were measured and blood samplings were carried out on Day 0, Day 14 and Day 28. In water-restriction groups (W80 and W60) a lower (P < 0.01) feed intake of meadow hay, and a lower ingestion of alfalfa hay pellet in the W60 group compared to W100 group were observed. In addition, the water restriction regimen resulted in a significant decrease of respiratory rate (P < 0.05) and an increase in serum total protein, urea, creatinine, sodium, chlorine, reactive oxygen metabolites, cortisol, haemoglobin and mean corpuscular haemoglobin concentration (P < 0.05), red blood cell counts, and haematocrit (P < 0.01). These results show the important role of water, as limiting factor for animal breeding in low-water availability environments. Where possible, the management of low-dairy breeds should be well adapted to support the productive performance.

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“…The same results were reported by other authors (Li et al 2000;Ghanem 2005;Hamadeh et al 2006) in experiments conducted on sheep after water restriction.…”

Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 86%

See 1 more Smart Citation

The effect of water-restriction on various physiological variables in intensively reared Lacaune ewes

Casamassima¹,

Vizzarri²,

Nardoia³

et al. 2016

Vet. Med. - Czech

View full text Add to dashboard Cite

show abstract

“…Dehydration reduces productivity (e.g. in plants; Farooq et al, 2009), alters blood chemistry (Hamadeh et al, 2006) and causes other alterations in physiology or behavior (Olsson, 2005;Dupoué et al, 2014). Furthermore, as both survival and reproduction rely on the availability of sufficient water resources, water imbalance can reduce animal fitness.…”

Section: Introductionmentioning

confidence: 99%

Dehydration enhances multiple physiological defense mechanisms in a desert lizard, Heloderma suspectum

Moeller

Demare

Davies

et al. 2017

Journal of Experimental Biology

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The physiological challenges associated with dehydration can induce an increase in plasma glucocorticoid concentrations, a response thought to provide the mechanism for dehydration suppressing immune function. However, a comprehensive examination of the inter-relationship of dehydration, stress and immune function has not been conducted within a single species. We previously demonstrated that Gila monsters (Heloderma suspectum), which inhabit a xeric environment with a predictable seasonal drought, have enhanced measures of innate immunity when dehydrated. These results suggest that, in this species, dehydration may not induce a glucocorticoid response, but, instead, enhances physiological defense mechanisms. To explore this possibility, we examined multiple measures of innate immunity as well as initial and reactive plasma concentrations of glucocorticoids in captive and free-ranging Gila monsters at various hydration states. Our results show that, in this species, dehydration alone does not cause a substantial increase in plasma glucocorticoids, and we provide broader evidence that dehydration enhances defensive mechanisms including stress reactivity and various measures of innate immune function. These findings suggest that physiological responses to dehydration may depend heavily on an organism's ecology. More research on the effects of dehydration on the glucocorticoid response and immunity will help clarify the interactive roles they play in response to hydration challenges and whether adaptations to water-limited environments influence these interactions.

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“…Thus, these animals have developed various behavioural, morphological and physiological adaptation mechanisms to enable them to survive, and in particular, to tolerate dehydration (Kay, 1997;Atti et al, 2000;Alamer and Al-hozab, 2004;Hamadeh et al, 2006). Compared with most other mammals, where losses of water over 15% of body mass can be fatal (Shkolnik et al, 1980), ruminants are able to tolerate water losses of up to 18%, 20%, 25% and more than 40% of their body mass as reported for cattle, sheep, camels and Bedouin goats, respectively (Shkolnik et al, 1980).…”

Section: Introductionmentioning

confidence: 99%

Effect of water restriction on drinking behaviour and water intake in German black-head mutton sheep and Boer goats

Al-Ramamneh

Riek

Gerken

2012

Animal

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The present study was conducted to evaluate and compare the physiological responses of sheep and goats to water restriction using the deuterium dilution technique (D 2 O) to predict the total water intake (TWI) in both species. In two consecutive trials, 10 non-lactating Boer goats and 10 non-lactating German black-head mutton ewes were each randomly allocated into a treatment and a control group. In the control groups (n 5 5, for each species), water was offered ad libitum, whereas the treatment groups (n 5 5, for each species) received water 3 h/day on experimental days 8 to 14 and 6 h every 2 days on experimental days 15 to 22. The respiratory rate, rectal temperature, body mass and drinking behaviour were also recorded. The TWI was estimated by D 2 O for each animal. Water restriction for 21 h/day or 42 h/2 days had no significant (P . 0.05) effect on water intake (WI), feed intake, WI to dry matter intake ratio or body mass in both species. The absence of differences between species in their WIs was also confirmed using D 2 O. However, sheep had higher respiratory rates and rectal temperatures than goats in both control and treatment groups. Both species showed the ability to tolerate a moderate water shortage by activating several physiological mechanisms and behavioural strategies.

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Physiological responses to water restriction in dry and lactating Awassi ewes

Cited by 49 publications

References 24 publications

The effect of water-restriction on various physiological variables in intensively reared Lacaune ewes

The effect of water-restriction on various physiological variables in intensively reared Lacaune ewes

Dehydration enhances multiple physiological defense mechanisms in a desert lizard, Heloderma suspectum

Effect of water restriction on drinking behaviour and water intake in German black-head mutton sheep and Boer goats

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