Photoperiodicity in cattle i. seasonal changes in coat character and their importance in heat regulation

Yeates N.T.M. (1955) Photoperiodicity in cattle i. seasonal changes in coat character and their importance in heat regulation. Australian Journal of Agricultural Research, 6 6: 891-902. doi:10.1071/AR9550891


Author Yeates N.T.M.
Title Photoperiodicity in cattle i. seasonal changes in coat character and their importance in heat regulation
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 1955
Sub-type Article (original research)
DOI 10.1071/AR9550891
Volume 6
Issue 6
Start page 891
End page 902
Total pages 12
Subject 1100 Agricultural and Biological Sciences
Abstract The seasonal changes in coat character of a control group of four young Poll Shorthorn cattle have been studied and compared with those of a similar group in which the daily photoperiod was altered to simulate the synchronous duration of daily lighting of the opposite (northern) hemisphere. Heat tolerance tests were conducted periodically as the animals assumed different coat types. The results show that the full range of coat changes which characterize well-nourished cattle of the type used in this experiment may, irrespective of seasonal temperature, be reversed by artificially reversing the seasonal trend of daylight duration. This is presumptive evidence that the natural light environment is a major controlling factor in the normal pattern of seasonal coat change which cattle of European origin exhibit. Cattle with sleek, summer-type coats have shown decisive heat tolerance superiority over those with deep, winter-type coats under the conditions of this experiment. Clipping tests indicate that it is the heavy coat itself which lowers heat tolerance, not a particular internal condition (of metabolism, for example) with which heavy-coatedness might be associated.
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, 26 Jul 2016, 03:03:24 EST by System User