Thermoregulation in sheep. III. Respiratory cooling in unshorn and shorn sheep belonging to three breeds kept in sun or in shade with or without access to tap water during the warm summer days
2004
Aleksiev, J. | Gudev, D. | Popova-Ralcheva, S. | Moneva, P. (Institut po Zhivotnov"dni Nauki, Kostinbrod (Bulgaria))
The aim of the experiment was to study the effect of heat load on respiratory rate in three breeds of sheep. The ewes were allocated into 3 breed differentiated groups (n=5). Respiratory rate was measured at 7, 14, 15 and 21 h before and following the shearing in exposed to sun or kept in shade ewes with or without access to tap water for 24 h. At 23-rd day following the shearing the ewes were given 0.9% water solution of MgCl2 to drink without any access to tap water. It was established that exposition to direct solar radiation caused breed specific acceleration of respiratory rate which was used for calculation of the tolerance to heat. Pleven blackhead sheep showed higher heat tolerance than the other two breeds. Shaded sheep had significantly lower respiratory cooling during the hot summer days.
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