Effects of desertification on the body temperature, activity and water turnover of Angora goats

Hetem, Robyn S.; Witt, Brenda A. de; Fick, Linda G.; Fuller, Andrea; Maloney, Shane K.; Meyer, Leith C. R.; Mitchell, Duncan; Kerley, Graham I. H.

doi:10.1016/j.jaridenv.2010.08.007

Cited by 15 publications

(9 citation statements)

References 49 publications

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“…The average daily T r fluctuations we report here were lowest in November (1.44 °C) and highest in September (1.61 °C, Table 2 ). These values are in the range of previously reported T b amplitudes for zebras (1.7 °C) 25 alpacas (1.5 °C) 26 , angora goats (1.4 °C) 27 , blesbok (1.4 °C) 26 , impalas (1.1 °C) 28 and pronghorn (1.0 °C) 29 . However, these values and our results are means of several animals over a number of days.…”

Section: Discussionsupporting

confidence: 81%

Energy expenditure and body temperature variations in llamas living in the High Andes of Peru

Riek

Stölzl

Bernedo

et al. 2019

Sci Rep

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Some large herbivores exhibit seasonal adjustments in their energy metabolism. Therefore, our aim was to determine if the llama (one of the most extensively kept livestock breeds) exhibits seasonal adjustment of their energy expenditure, body temperature and locomotion, under its natural high altitude Andean habitat. For this purpose, energy expenditure, body temperature and locomotion were measured in seven non-pregnant llama dams for ten months on the Andean High Plateau (4400 m above sea level). Daily energy expenditure was measured as field metabolic rate using the doubly labelled water method at four different measurement times. Additionally, a telemetry system was used to continuously record activity, body temperature (3 min intervals) as well as the position (hourly) of each animal. The results show that llamas adjusted their body temperature and daily energy expenditure according to environmental conditions. Furthermore, llamas under high altitude Andean climatic conditions exhibited a pronounced daily rhythm in body temperature and activity, with low values at sunrise and increasing values towards sunset. Llamas also had remarkably low energy expenditure compared to other herbivores. Thus, despite the domestication process, llamas have not lost the ability to adjust their body temperature and daily energy expenditure under adverse environmental conditions, similar to some wild herbivores.

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Section: Discussionsupporting

confidence: 81%

Energy expenditure and body temperature variations in llamas living in the High Andes of Peru

Riek

Stölzl

Bernedo

et al. 2019

Sci Rep

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“…Data from [91,115,120] able to access microclimate refuges than were Angora goats in an adjacent pristine habitat. As a result, goats in the transformed habitat were more water-dependent and experienced larger increases in body core temperature over the day than did the goats in the pristine habitat [93]. Both the number of microclimate refuges and the quality of the shade are likely to decrease in regions that will experience reduced precipitation with climate change.…”

Section: Behavioural Adjustmentsmentioning

confidence: 99%

Towards a mechanistic understanding of the responses of large terrestrial mammals to heat and aridity associated with climate change

Fuller

Mitchell

Maloney

et al. 2016

Clim Chang Responses

151

127

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In the face of climate change, the life history traits of large terrestrial mammals will prevent them from adapting genetically at a sufficient pace to keep track with changing environments, and habitat fragmentation will preclude them from shifting their distribution range. Predicting how habitat-bound large mammals will respond to environmental change requires measurement of their sensitivity and exposure to changes in the environment, as well as the extent to which phenotypic plasticity can buffer them against the changes. Behavioural modifications, such as a shift to nocturnal foraging or selection of a cool microclimate, may buffer free-living mammals against thermal and water stress, but may carry a cost, for example by reducing foraging time or increasing predation risk. Large mammals also use physiological responses to buffer themselves against changing environments, but those buffers may be compromised by a changing physical environment. A decrease in the available food energy or water leads to a trade-off in which the precision of homeothermy is relaxed, resulting in large daily fluctuations in body temperature. Understanding how large mammals prioritise competing homeostatic systems in changing environments, and the consequences of that prioritisation for their fitness, requires long-term monitoring of identifiable individual animals in their natural habitat. Although body size predicts general ecological and energetic patterns of terrestrial mammals, high intraspecific and interspecific variability means that a species-directed approach is required to accurately model responses of large mammals to climate change.

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“…Le climat et les changements de mode de gestion ont participé dans d'autres régions du monde à la désertification des zones pastorales, d'où l'importance de l'adaptation des systèmes d'élevage de ruminants (Hetem et al, 2011). L'usage des parcours reste une stratégie adaptée pour l'élevage dans les zones arides et semi-arides présentant de fortes variabilités climatiques (Ruppert et al, 2015).…”

Section: Introductionunclassified

Les systèmes d’élevage de petits ruminants en Tunisie Centrale : stratégies différenciées et adaptations aux transformations du territoire

et al. 2016

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Résumé -En Tunisie centrale, l'élevage ovin reste très présent, malgré les nombreuses perturbations auxquelles il fait face depuis les années 1970 : aléas climatiques, évolutions socio-économiques et culturelles, développement des cultures. Ces évolutions entraînent une diminution des ressources issues des parcours. Il s'agit de comprendre comment des familles maintiennent une activité d'élevage dans ce contexte. L'étude a été menée grâce à une enquête réalisée en 2012-2013 chez 60 éleveurs. Quatre systèmes d'élevage ont été identifiés. Trois systèmes reposent sur l'élevage de brebis et la production d'agneaux plus ou moins finis. Les « pasteurs transhumants » utilisent la mobilité à grande distance pour accéder à des parcours de végétation spontanée, gérés par l'État. Les « agriculteurs-éleveurs » utilisent le pâturage des chaumes et d'autres ressources issues des terres cultivées, ce qui leur donne une plus grande capacité d'adaptation face aux changements. Les « pluriactifs » se révèlent les plus affectés par l'occupation des terres par les cultures, au détriment des parcours dont leur élevage dépend encore. Dans ces systèmes naisseurs, une forte proportion d'éleveurs pense diminuer leurs effectifs, voire même abandonner l'activité d'élevage, face aux difficultés qu'ils rencontrent. Un quatrième système, les « négociants-engraisseurs », s'est fortement développé, fondé sur l'engraissement au grain d'agneaux achetés, sans élevage de brebis. Cette activité est rentable à court terme, mais s'avère toutefois vulnérable face aux variations des prix des compléments alimentaires.Mots clés : système / typologie / pratique / pâturage / ovins / Maghreb Abstract -Sheep breeding in Central Tunisia: varied strategies and adaptations to changes in land use. Sheep breeding in central Tunisia remains widespread, despite the many problems it had to face since the 1970s: climate hazards, socio-economic and cultural changes and the development of cropped area. These changes have led to a decrease in forage resources from rangelands. The aim of this study was to understand how families are able to maintain sheep breeding in such a context. The study involved a survey among a sample of 60 farmers in 2012-2013. We identified four types of livestock systems. Three types are based on the raising of ewes and the production of lean or fat lambs. "Transhumant pastoralists" are using long-distance mobility to access rangelands with wild vegetation, managed by the State. "Crop-Livestock" farmers use stubble for pasture, along with other resources derived from farmed land and have a greater adaptive capacity to cope with changes. Multiactive families are the most affected by the extension of crops at the expense of rangelands. For these three systems, many farmers are thinking of decreasing their number of ewes or even giving up sheep farming, due to the difficulties they face. A fourth "trader-fattener" system is strongly developing, based on fattening purchased lean lambs with grain, without raising ewes. This activity is profitable in ...

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Effects of desertification on the body temperature, activity and water turnover of Angora goats

Cited by 15 publications

References 49 publications

Energy expenditure and body temperature variations in llamas living in the High Andes of Peru

Energy expenditure and body temperature variations in llamas living in the High Andes of Peru

Towards a mechanistic understanding of the responses of large terrestrial mammals to heat and aridity associated with climate change

Les systèmes d’élevage de petits ruminants en Tunisie Centrale : stratégies différenciées et adaptations aux transformations du territoire

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