Heat and water in tropical merino sheep

Macfarlane W.V., Morris R.J.H. and Howard B. (1958) Heat and water in tropical merino sheep. Australian Journal of Agricultural Research, 9 2: 217-228. doi:10.1071/AR9580217


Author Macfarlane W.V.
Morris R.J.H.
Howard B.
Title Heat and water in tropical merino sheep
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 1958
Sub-type Article (original research)
DOI 10.1071/AR9580217
Volume 9
Issue 2
Start page 217
End page 228
Total pages 12
Subject 1100 Agricultural and Biological Sciences
Abstract The relation between environment and the water intake and output of young Merino sheep living in the hot dry tropics on lat. 21° S. has been studied for 3 years.The tip wool of sheep standing in the sun heats to 189°F by absorption of radiant energy, most of which is re-radiated. Wool, especially when it is more than 3 cm long, assists in protecting sheep from radiant energy. The respiratory rates of sheep shorn during summer were more than twice those of unshorn sheep standing in the sun. On the open plains summer shearing appears to add to the thermal strain. Acclimatizing sheep respired more rapidly in the sun than tropical sheep.Evaporative cooling, by panting, increases water demand, and in summer Merinos drank on the average 12 times as much water as in winter, when they took 7.3 ml/kg/day. Water intake is related closely to respiratory rate.Urine output was lower in summer than in winter.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Tue, 28 Jun 2016, 04:10:24 EST by System User