du Preez J H, Hattingh P J, Giesecke W H, Eisenberg B E
Veterinary Research Institute, Department of Agricultural Development, Onderstepoort, Republic of South Africa.
Onderstepoort J Vet Res. 1990 Dec;57(4):243-8.
Temperature-humidity index (THI) values applicable to South Africa and Namibia have been established during this investigation for each month of the year by means of computerized modelling and mapping techniques. The data indicate that each year heat stress risk areas (HSRA's) expand from August to January and retract from February to July. The THI values classified according to the Livestock Weather Safety Index (LWSI) for lactating dairy cattle (LDC), suggest that, especially during November to March there is the risk of moderate to advanced heat stress in most South African dairy cows. This has important implications for their general health, udder health, production and reproduction. Careful planning of facilities and highly adaptable herd management are required to protect dairy cattle from heat stress.
在本次调查过程中，通过计算机建模和绘图技术，确定了适用于南非和纳米比亚的全年各月温度-湿度指数（THI）值。数据表明，每年的热应激风险区域（HSRA）从8月至1月扩大，从2月至7月收缩。根据泌乳奶牛（LDC）的家畜天气安全指数（LWSI）分类的THI值表明，特别是在11月至3月期间，大多数南非奶牛存在中度至重度热应激风险。这对它们的总体健康、乳房健康、生产和繁殖具有重要影响。需要精心规划设施并采用高度适应性的畜群管理措施，以保护奶牛免受热应激影响。
