Effect of heat-stress on conception in a dairy-herd model in the Natal highlands of South Africa

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dc.contributor.author Du Preez, J.H.
dc.contributor.author Willemse, J.J.C.
dc.contributor.author Van Ark, H.
dc.contributor.editor Verwoerd, Daniel Wynand
dc.date.accessioned 2013-12-09T08:05:28Z
dc.date.available 2013-12-09T08:05:28Z
dc.date.created 2013
dc.date.issued 1994
dc.description The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format. en
dc.description.abstract Regression models are proposed for predicting conception rate in a dairy herd under South African and especially Natal conditions. Conception rate (CR%) was related to mean monthly temperature-humidity index (THI) by curvilinear regression equation model; CR% = -812,7 + 28,61THI - 0,2322THI² (P = 0,061), and by linear regression equation model; CR% = 188,0 - 1,906THI (P = 0,023). Conception rate was related to numerical month of the year (M) by: CR% = 44,34 + 6,168M - 0,428M² (P = 0,1 06). Further investigations to test the proposed regression models under various dairy-herd conditions and to improve reproduction in South African dairy herds are needed. en
dc.description.librarian mn2013
dc.identifier.citation Du Preez, JH, Willemse, JJC & Van Ark, H 1994, 'Effect of heat-stress on conception in a dairy-herd model in the Natal highlands of South Africa', Onderstepoort Journal of Veterinary Research, vol. 61, no. 1, pp. 1-6. en
dc.identifier.issn 0330-2465
dc.identifier.uri http://hdl.handle.net/2263/32737
dc.language.iso en en
dc.publisher Published by the Agricultural Research Council, Onderstepoort Veterinary Institute en
dc.rights © ARC-Onderstepoort (original). © University of Pretoria. Dept of Library Services (digital). en
dc.subject Veterinary medicine en
dc.subject Friesian cattle en
dc.subject Lidgetton en
dc.subject.lcsh Veterinary medicine -- South Africa
dc.subject.lcsh Heat -- Physiological effect en
dc.title Effect of heat-stress on conception in a dairy-herd model in the Natal highlands of South Africa en
dc.type Article en


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