Du Preez, J.H.; Giesecke, W.H.; Hattingh, P.J.; Verwoerd, Daniel Wynand
(Published by the Government Printer, Pretoria., 1990)
The Livestock Weather Safety Index (LWSI) indicates that in large areas of South Africa and South West Africa / Namibia and for prolonged periods of the year warm conditions are causing heat stress in food producing animals, ...