Faculty of Natural and Agricultural Sciences
School of Agricultural and Food Sciences
Department of Animal and Wildlife Sciences
van Niekerk, WA
MSc(Agric) PhD(Pret) - Associate Professor
Contact Details
Research Interests
Research Output
Contact Details:
Telephone number: 012 420 3267
Fax number: 012 420 3290
E-mail address: willem.vanniekerk@up.ac.za
Research Interests:
Production systems and management
Nutrition
Research Output:
Research articles in refereed specialist journals:
Hassen A, Rethman NFG, Apostolides Z, van Niekerk WA: 2007. Influence of moisture stress on growth, dry matter yield and allocation, water use and water use efficiency of four Indigofera species. African Journal of Range and Forage Science, 24 (1), pp 25-34.
Hassen A, Gizachew L, Rethman NFG, van Niekerk WA: 2007. Influence of undersowing forages in maize on grain, fodder yield and soil properties in sub-humid region of western Ethiopia. African Journal of Range and Forage Science, 24 (1), pp 35-41, Full Text
van Niekerk WA, Hassen A, Bechaz FM: 2007. Influence of molasses additive and moisture level at ensiling on fermentative characteritics of Panicum maximum. African Journal of Range and Forage Science, 24 (2), pp 97-102, Full Text
Hassen A, Rethman NFG, van Niekerk WA, Tjelele TJ: 2007. Influence of season/year and species on chemical composition and in vitro digestibility of five Indigofera accessions. Animal Feed Science and Technology, 136, pp 312-322.
Sebsibe A, Casey NH, van Niekerk WA, Tegegne A, Coertze RJ: 2007. Growth performance and carcass characteristics of three Ethiopian goat breeds fed grainless diets varying in concentrate to roughage ratios. South African Journal of Animal Science, 37 (4), pp 221-232.
van Niekerk WA, Hassen A, Casey NH, Coertze RJ: 2007. Effect of different grazing pressure by lambs grazing Lolium perenne and Dactylis glomerata pastures during spring on: 1. Diet quality. South African Journal of Animal Science, 36 (5-1), pp 46-49.
Hassen A, van Niekerk WA, Rethman NFG, Tjelele TJ: 2007. Intake and in vivo digestibility of Indigofera forage compared to Medicago sativa and Leucaena leucocephala by sheep. South African Journal of Animal Science, 36 (5-1), pp 67-70.
van Niekerk WA, Hassen A, Vermaak PJ, Rethman NFG, Coertze RJ: 2007. Ruminal degradation and in vitro gas production characteristics of foliage from Atriplex species and Cassia sturtii. South African Journal of Animal Science, 36 (5-1), pp 54-58.
Skenjana A, van Ryssen JBJ, van Niekerk WA: 2007. In vitro digestibility and in situ degradibility of avocado meal and macadamia waste products in sheep. South African Journal of Animal Science, 36 (5-1), pp 78-81.
du Toit CJL, van Niekerk WA, Hassen A, Coertze RJ, Rethman NFG: 2007. Fermentation in the rumen of sheep fed Atriplex nummularia cv. De Kock supplemented with incremental level of barley and maize grain. South African Journal of Animal Science, 36 (5-1), pp 74-77.
van Niekerk WA, Hassen A, Casey NH, Coertze RJ: 2007. Effect of different grazing pressure by lambs grazing Lolium perenne and Dactylis glomerata pastures during spring on: 2. Intake and Growth. South African Journal of Animal Science, 36 (5-1), pp 50-53.
van Niekerk WA, Hassen A, Bechaz FM, Coertze RJ: 2007. Fermentative attributes of wilted vs. unwilted Digitaria eriantha silage treated with or without molassas at ensiling. South African Journal of Animal Science, 37 (4), pp 261-268.
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