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| Título : | Thermoregulation and water balance in fat-tailed sheep and Kacang goat under sunlight exposure and water restriction in a hot and dry area |
| Autor : | D. P. Rahardja
A. L. Toleng
V. S. Lestari |
| Fecha de publicación : | 2011 |
| Citación : | The Animal Consortium, p. 1587-1593 |
| Resumen : | The objective of this study was to analyze differences in thermoregulation and water balance under conditions of heat load
and water restriction between fat-tailed sheep (S) and Kacang goats (G). The daily intakes of food and water, daily outputs of
urine and feces, rectal temperature, respiration rates, hematocrit values and plasma volumes of five shorn S and five G were
determined over 10 days of four consecutive experimental conditions: (1) indoor – unrestricted water; (2) indoor – restricted
water; (3) 10 h sunlight exposure – unrestricted water; and (4) 10 h sunlight exposure – restricted water. There was a 6- to 7-day
adjustment period between two consecutive conditions. The study was conducted during the dry season. The animals were placed
in individual cages, fed chopped native grass ad libitum and had free access to a urea–molasses multi-nutrient block. Under
sunlight exposure with unrestricted water availability, S and G record an increase in the maximum rectal temperatures from
39.28C to 40.28C and from 39.98C to 41.88C, respectively. The thermoregulatory strategy used by S for maintaining a lower rectal
temperature mostly depends on increasing the respiration rate as the main cooling mechanism. On the other hand, G apparently
used sweating as the predominant mechanism for cooling. Moreover, G seemed to be more tolerable to higher heat storage and
body temperature than S with a significant increase in plasma volume ( P,0.01), and this may be beneficial to the animals for
the prevention of water loss. Under restricted water condition in either indoor or outdoor environment, both species decreased
their plasma volume significantly, but rectal temperatures were relatively maintained. In all experimental conditions, the daily total
water exchanges (ml/kg0.82 per day) of S were significantly higher than G ( P,0.01). However, when the percentages of the total
daily water exchange were considered, the water lost through urination (38% to 39%), defecation (11% to 14%) and evaporation
(46% to 49%) by S and G was not significantly different. Therefore, the results from this study clearly showed that S and G have
different homeostatic strategies for the regulation of body temperature and fluid to cope with heat load and water restriction.
These differences may have an important impact on the production management of S and G. |
| License: | http://andzoa.ma/fr |
| URI : | http://localhost:8080/dspace/handle/0/3533 |
| Aparece en las colecciones: | Fonds Documentaire
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