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Browsing 1990 Onderstepoort Journal of Veterinary Research, Volume 57, 1990 by Author

Browsing 1990 Onderstepoort Journal of Veterinary Research, Volume 57, 1990 by Author "Giesecke, W.H."

Now showing items 1-6 of 6

Heat stress in dairy cattle and other livestock under southern African conditions. I. Temperature-humidity index mean values during the four main seasons

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, ...
Heat stress in dairy cattle and other livestock under southern African conditions. III. Monthly temperature-humidity index· mean values and their significance in the performance of dairy cattle

Du Preez, J.H.; Hattingh, P.J.; Giesecke, W.H.; Eisenberg, B.E.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)

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 ...
Heat stress in dairy cattle under southern African conditions. II. Identification of areas of potential heat stress during summer by means of observed true and predicted temperature-humidity index values

Du Preez, J.H.; Giesecke, W.H.; Hattingh, P.J.; Eisenberg, B.E.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)

November-March are the hottest months of the year with the highest monthly mean "temperature-humidity index" (THI) in South Africa and Namibia. These 5 months are associated with severe heat stress in dairy cattle, are of ...
Salmonella isolated from feeds and feed ingredients during the period 1982-1988 : animal and public health implications

Durand, Anette M.; Giesecke, W.H.; Barnard, Marie-Luise; Van der Walt, Martha L.; Steyn, Helena C.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)

The prevalence of Salmonella in southern Africa in farm feeds and by-products of animal origin during 1982-1988 was determined. Salmonella occurred in 5,18% of the farm feed samples and in 9,54% of the by-product samples. ...
Udder health implications of premature bovine mammary regression. I. Clinical, subclinical and reducing-sugar changes in milk during 168 hours of suspended milking in mid-lactation

Giesecke, W.H.; Korybut-Woroniecki, P.A.; Kowalski, Z.E.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)

The investigation involved 4 mastitis-free cows, exposed to 168 h of suspended milking to induce prolonged milk stasis and premature mammary regression during mid-lactation. After 48 h the milk stasis elicited mastitis-like ...
Udder health implications of premature bovine mammary regression. II. Collateral intramammary reactions in quarters milked normally during 168-hour milk stasis in opposite quarters

Giesecke, W.H.; Korybut-Woroniecki, P.A.; Kowalski, Z.E.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)

This investigation has shown that collateral intramammary reactions (CIR's) occur when secretory disturbances in one quarter lead to corresponding changes in one or more of the other, unperturbed, quarters of the same ...

Now showing items 1-6 of 6

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Browsing 1990 Onderstepoort Journal of Veterinary Research, Volume 57, 1990 by Author "Giesecke, W.H."

Browsing 1990 Onderstepoort Journal of Veterinary Research, Volume 57, 1990 by Author "Giesecke, W.H."

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