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Browsing Research Articles (Animal and Wildlife Sciences) by Author "Van Niekerk, Willem A."
Now showing items 1-20 of 21
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Rautenbach, Esmari; Van Ryssen, J.B.J.; Van Niekerk, Willem A. (South African Society for Animal Science, 2008)Samples of kikuyu foggage (standing hay) were collected in northern KwaZulu-Natal from five adjoining paddocks to measure the changes in nutrient composition of the foggage as winter progressed. Leaves and stems were ...
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Du Toit, Cornelius Jacobus Lindeque; Meissner, H.H.; Van Niekerk, Willem A. (South African Society for Animal Science, 2013)Previous greenhouse gas (GHG) inventories did not include game as an emissions source. Recently game farming has become a recognized commercial enterprise in the agricultural sector in South Africa, contributing approximately ...
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Du Toit, Cornelius Jacobus Lindeque; Van Niekerk, Willem A.; Meissner, H.H. (South African Society for Animal Science, 2013)There are increasing concerns about the impact of agriculture and livestock production on the environment. As a result, it is important to have accurate estimations of greenhouse gas (GHG) emissions if reduction measures ...
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Du Toit, Cornelius Jacobus Lindeque; Van Niekerk, Willem A.; Meissner, H.H. (South African Society for Animal Science, 2013)There are increasing concerns about the impact of agriculture and livestock production on the environment. In this the greenhouse gas emissions (GHG) from South African pigs, ostriches, horses, donkeys, mules and poultry ...
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Du Toit, Cornelius Jacobus Lindeque; Meissner, H.H.; Van Niekerk, Willem A. (South African Society for Animal Science, 2013)The objective of this study was to estimate direct methane and nitrous oxide emissions of South African dairy and beef cattle in total and per province using the Tier 2 methodology of the Intergovernmental Panel on Climate ...
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Effect of diets differing in rumen soluble nitrogen on utilization of poor-quality roughage by sheep Mentz, A.M.; Van Niekerk, Willem A.; Hassen, Abubeker; Coertze, R.J. (Roelof Johannes); Gemeda, B.S. (Belete Shenkute) (South African Society for Animal Science, 2015-12-14)This study investigated the effects of replacing rapid-release nitrogen (N) from urea with a graded level of slow-release N (Optigen® II) source on intake, digestibility, rumen fermentation and microbial protein synthesis, ...
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Moyo, Robin Mkhokheli; Van Niekerk, Willem A.; Hassen, Abubeker; Coertze, Roelof Johannes; Du Toit, Cornelius Jacobus Lindeque; Gemeda, Belete Shenkute (South African Society for Animal Science, 2016-02-09)Wet distillers grains with soluble (WDGS) were blended with whole maize plants on an as-fed basis at 0%, 20%, 30%, and 40% and ensiled in 3 L bottles to evaluate the silage fermentation characteristics and ensiling quality ...
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Malleson, Evelyn Rhoda; Meeske, R.; Erasmus, Lourens Jacobus; Van Niekerk, Willem A.; Coertze, R.J. (Roelof Johannes) (South African Society for Animal Science, 2008)This trial was conducted to test the hypothesis that early lactation cows grazing ryegrass pasture and receiving maize and mineral supplementation could respond to additional supplementation with a protein source such as ...
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Malleson, Evelyn Rhoda; Meeske, R.; Erasmus, Lourens Jacobus; Van Niekerk, Willem A.; Coertze, Roelof Johannes (Tropical Grassland Society of Australia, 2009)An experiment examined the benefit of feeding fishmeal to high-producing Jersey cows receiving a maize-based supplement (6 kg/d), while grazing kikuyu pasture in late summer. Three groups of 14 cows received no additional ...
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Hassen, Abubeker; Theart, J.J.F.; Van Niekerk, Willem A.; Adejoro, Festus Adeyemi; Gemeda, B.S. (Belete Shenkute) (CSIRO, 2016-02)An in vitro gas production study was conducted to evaluate the potential of six browse species (high, medium and low condensed tannin concentrations) collected from the Kalahari Desert as antimethanogenic additives to an ...
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Theart, Jacobus Johannes Francois; Hassen, Abubeker; Van Niekerk, Willem A.; Gemeda, B.S. (Belete Shenkute) (Escola Superior de Agricultura, 2015-11)The nutritional value of browse foliage from the Thorny Kalahari Dune Bush veld of South Africa is not characterized. Most of this browse species is rich in tannin, but still palatable, and is consumed by ruminants during ...
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Van Niekerk, Willem A.; Hassen, Abubeker; Bechaz, Federico Martino (South African Society for Animal Science, 2009)The aim of this study was to compare intake and partial digestibility of organic matter (OM) and nitrogen (N) of two ensiled tropical grass species, P. maximum and D. eriantha, made either at the boot or full bloom stage ...
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Van Niekerk, Willem A.; Hassen, Abubeker; Bechaz, Federico Martino (South African Society for Animal Science, 2010)An experiment was conducted to investigate the influence of stage of growth at harvest on fermentative characteristics of Panicum maximum silage. The treatments were three different growth stages (early vegetative, boot ...
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Van Niekerk, Willem A.; Hassen, Abubeker; Vermaak, P.J.; Coertze, R.J. (Roelof Johannes) (South African Society for Animal Science, 2009)Atriplex species/cultivars [Atriplex nummularia, A. canescens (Santa Rita) and A. canescens (Field Reserve 1)] were compared in terms of chemical composition and in vitro digestibility. The plant material was sampled at ...
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Hassen, Abubeker; Gizachew, L.; Rethman, N.F.G.; Van Niekerk, Willem A. (NISC, 2007-03)In the densely populated mixed farming areas of western Ethiopia, the integration of forages with food crops may be crucial to the achievement of sustainable crop and livestock production. This study investigated the effects ...
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Du Toit, Cornelius Jacobus Lindeque; Van Niekerk, Willem A.; Meissner, H.H. (Heinz); Erasmus, Lourens Jacobus; Coertze, Roelof Johannes (CSIRO, 2020-06)CONTEXT : Reducing emissions of greenhouse gases from livestock production systems is a global research priority. Forages that contain condensed tannins, such as the perennial legume Lespedeza cuneata, may help to reduce ...
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Du Toit, Cornelius Jacobus Lindeque; Van Niekerk, Willem A.; Meissner, Heinz H.; Erasmus, Lourens Jacobus; Morey, Liesl (CSIRO, 2019-01)The aim of the study was to evaluate the effect of nitrogen (N) fertilisation on certain quality parameters and in vitro total gas and methane production of improved grass species commonly used as fodder species in South ...
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Moyo, Robin Mkhokheli; Van Niekerk, Willem A.; Hassen, Abubeker; Du Toit, Cornelius Jacobus Lindeque; Adejoro, Festus Adeyemi (Escola Superior de Agricultura, 2022)The high moisture content of wet distillers’ grains with solubles (WDGS) has limited its feeding value despite the relatively high nutritive value. The co–ensiling with whole–plant maize, as a complementary feed, was ...
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Meissner, H.H. (Heinz); Van Niekerk, Willem A.; Paulsmeier, D.V.; Henning, P.H. (South African Society for Animal Science, 1995)Research on ruminant nutrition in South Africa is reviewed for the decade1 985/1995. The review covers the following topics: feed requirements and forage preferences in relation to carrying capacity, intake measurement ...
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Hassen, Abubeker; Van Niekerk, Willem A.; Bechaz, Federico Martino (South African Society for Animal Science, 2009)The aim of this study was to compare two tropical grass species, Panicum maximum and Digitaria eriantha, in terms of silage fermentation attributes and certain rumen fermentation characteristics of silage made either at ...
Now showing items 1-20 of 21