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Browsing Research Articles (Animal and Wildlife Sciences) by UP Author

Browsing Research Articles (Animal and Wildlife Sciences) by UP Author "Van Ryssen, J.B.J."

Now showing items 1-5 of 5

Geographical distribution of the selenium status of herbivores in South Africa

Van Ryssen, J.B.J. (South African Society for Animal Science, 2001)

Available information on the selenium (Se) status of grazing herbivores in South Africa is reviewed and collated in the form of a geographical distribution map. Marginal to acute Se deficiencies have been reported to occur ...
A glance at achievements of SASAS and animal scientists in southern Africa over more than 50 years

Van Ryssen, J.B.J. (South African Society for Animal Science, 2018-09-26)

With the congress theme of ‘Golden Innovations for Sustainable Animal Agriculture’, it would be opportune to look not only at innovations with present and future potential, but at those ‘golden innovations’ that have ...
Selenium (Se) supplementation on the Se status of dairy cows in the Midlands of KwaZulu-Natal

Van Ryssen, J.B.J.; O'Dell, E.D. (South African Society for Animal Science, 2006)

A dose-response trial was conducted with dairy cows on six farms in the Ixopo district of the Midlands of KwaZulu-Natal. Up to 30 cows per farm received a single subcutaneous injection of 5 mL of a long-acting / slow-releasing ...
Supplementation of selenium to sheep grazing kikuyu or ryegrass : I. Selenium status of unsupplemented sheep and animal performance upon supplementation

Van Ryssen, J.B.J.; Coertze, R.J. (Roelof Johannes); De Villiers, J.F. (South African Society for Animal Science, 1999)

The selenium (Se) status of lambs grazing kikuyu (Pennisetum clandestinum) or ryegrass (Lolium multiflorum) in the KwaZulu-Natal Midlands was determined during four trials and their growth response to Se supplementation ...
Supplementation of selenium to sheep grazing kikuyu or ryegrass : II. Effect on selenium concentration in the grass and body tissues

Van Ryssen, J.B.J.; Coertze, R.J. (Roelof Johannes); De Villiers, J.F. (South African Society for Animal Science, 1999)

The investigation entailed four trials in which selenium (Se) was supplemented to lambs grazing kikuyu (Pennisetum clandestinum) pastures during two summer periods or Italian ryegrass (Lolium multiflorum) pastures during ...

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Browsing Research Articles (Animal and Wildlife Sciences) by UP Author "Van Ryssen, J.B.J."

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