Tag: "stress"

  • In the present work, we have studied daily rhythmicity of body temperature (Tb) in Arabian camels challenged with daily heat, combined or not with dehydration. We confirm that Arabian camels use heterothermy to reduce heat gain coupled with evaporative heat loss during the day. Here, we also demonstrate that this mechanism is more complex than previously reported, because it is characterized by a daily alternation (probably of circadian origin) of two periods of poikilothermy and homeothermy. We also show that dehydration induced a decrease in food intake plays a role in this process. Together, these findings highlight that adaptive heterothermy in the Arabian camel varies across the diurnal light–dark cycle and is modulated by timing of daily heat and degrees of water restriction and associated reduction of food intake. The changed phase relationship between the light–dark cycle and the Tb rhythm observed during the dehydration process points to a possible mechanism of internal desynchronization during the process of adaptation to desert environment. During these experimental conditions mimicking the desert environment, it will be possible in the future to determine if induced high‐amplitude ambient temperature (Ta) rhythms are able to compete with the zeitgeber effect of the light–dark cycle. more »
  • In the Southeast one of the things most dreaded by alpaca owners is heat stress, especially after the "Summer of 2007". Heat stress can not only cause temporary or permanent sterility, it can be lethal regardless of type, sex or age of the Alpaca. After the unusual heat wave and high humidity in the Southeast this past summer, I wanted to share what High Meadow Alpacas does to prevent and cope with if it happens. This is certainly not what everyone will do or should do, but just happens to be "our" protocol. Having shade and shelter is imperative. And then you go to work from there. more »
  • I am out working with the teaching herd with a few of my students. I notice that we are very comfortable but that a few of the animals have increased respiratory rate and effort. This reminds me of the individual variation of these creatures. Every animal responds to stress - heat stress or any other - differently. more »
  • Alpacas evolved in the higher altitudes of the Andes Mountains where the temperature rarely gets above 75 to 80 degrees. They are not equipped to handle high heat and humidity. This creates management problems in many parts of the United States during the summer months. more »