The absorptivity for solar radiation of different coloured hairy coats of cattle

Show simple item record Riemerschmid, G. Elder, J.S.
dc.contributor.editor Du Toit, P.J. 2017-03-06T08:40:21Z 2017-03-06T08:40:21Z 2017 1945
dc.description The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format. en_ZA
dc.description.abstract 1. The mean effective absorptivity for solar radiation of the hairy coats of cattle was determined. It was found that the colour of the hair is the most important characteristic in effecting the total percentage of radiation absorbed. 2. The mean effective absorptivity was found to be 49 per cent. for the hairy coat of a white Zulu, 78 per cent. for that of a red Afrikaner and 89 per cent. for that of a black Aberdeen Angus. 3. The difference in absorption due to the direction of the hair in relation to the direction of the incoming solar beam was found to be not more than 4 per cent. (usually 1 to 2 per cent.). 4. No appreciable difference was found between the absorptivity of an autumn and a winter coat of two Afrikaner beasts. The mean absorptivity of a Sussex winter coat was not more than 2 per cent. higher than that of a Sussex summer coat. 5. A comparison of the absorptivity of an Afrikaner autumn coat with the hair smoothed down and with the hair standing up showed no appreciable difference. 6. After clipping a long-haired Sussex winter coat to about ½ inch in length, the mean effective absorptivity was found to be 2 per cent. lower than on the unclipped curly hair. This smaller absorption was probably due to the slightly lighter colour of the clipped hair. 7. The comparison of six hairy coats of different shades of red and of different grades of smoothness showed that the mean effective absorptivity varied between 78 per cent. and 83 per cent. The above findings show that the colour is the most important factor effecting the absorptivity of hairy coats for solar radiation, and that direction of the hair, its smoothness or curliness and seasonal changes in the character of the coat are of secondary importance. en_ZA
dc.identifier.citation Riemerschmid, G & Elder, JS 1945, 'The absorptivity for solar radiation of different coloured hairy coats of cattle', Onderstepoort Journal of Veterinary Science and Animal Industry, vol. 20, no. 2, pp. 223-234. en_ZA
dc.identifier.issn 0330-2465
dc.language.iso en en_ZA
dc.publisher Published by The Government Printer, Pretoria en_ZA
dc.rights © 1945 ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). © 2017 University of Pretoria. Dept. of Library Services (digital). en_ZA
dc.subject Veterinary medicine en_ZA
dc.subject.lcsh Veterinary medicine -- South Africa
dc.title The absorptivity for solar radiation of different coloured hairy coats of cattle en_ZA
dc.type Article en_ZA

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