• Production responses of high producing Holstein cows to ruminally protected phenylalanine and tyrosine supplemented to diets containing high levels of canola meal 

  Swanepoel, Nadia; Robinson, P.H.; Erasmus, L.J. (Lourens Jacobus) (Elsevier, 2018-09)

  Phenylalanine (Phe) was first identified as a potentially limiting amino acid (AA) in lactating dairy cows in 1974. There is the possibility that conversion of Phe to tyrosine (Tyr) is not efficient enough to supply all ...
• Modelled impacts of extreme heat and drought on maize yield in South Africa 

  Mangani, Robert; Tesfamariam, Eyob Habte; Bellocchi, Gianni; Hassen, Abubeker (CSIRO, 2018-07)

  This study assessed two versions of the crop model CropSyst (i.e. EMS, existing; MMS, modified) for their ability to simulate maize (Zea mays L.) yield in South Africa. MMS algorithms explicitly account for the impact of ...
• Changes in African elephant (Loxodonta africana) faecal steroid concentrations post-defaecation 

  Webber, Judith T.; Henley, Michelle D.; Pretorius, Yolanda; Somers, Michael J.; Ganswindt, Andre (AOSIS Open Journals, 2018-06-12)

  BACKGROUND : Faecal hormone metabolite measurement is a widely used tool for monitoring reproductive function and response to stressors in wildlife. Despite many advantages of this technique, the delay between defaecation, ...
• Productive performance of commercial growing and finishing pigs supplemented with a Buttiauxella phytase as a total replacement of inorganic phosphate 

  Dersjant-Li, Yueming; Plumstead, P.W. (Peter); Awati, Ajay; Remus, Jane (Elsevier, 2018-02)

  The objective of this study was to test if a novel phytase from Buttiauxella sp. can replace all added inorganic phosphate in a diet with reduced Ca and metabolizable energy (ME) fed to commercial pigs from 12 kg body ...
• Effect of concentrate level on enteric methane emissions, production performance and rumen fermentation of Jersey cows grazing kikuyu-dominant pasture during summer 

  Van Wyngaard, J.D.V. (Josef); Meeske, R.; Erasmus, L.J. (Lourens Jacobus) (American Dairy Science Association, 2018)

  The effect of concentrate feeding level on enteric methane (CH4) emissions from cows grazing medium quality summer pasture is yet to be investigated. Sixty multiparous Jersey cows (9 rumen-cannulated) were used in a ...
• Effect of concentrate feeding level on methane emissions, production performance and rumen fermentation of Jersey cows grazing ryegrass pasture during spring 

  Van Wyngaard, J.D.V. (Josef); Meeske, R.; Erasmus, L.J. (Lourens Jacobus) (Elsevier, 2018-07)

  Dietary supplementation has been well documented as an effective enteric methane (CH4) mitigation strategy. However, limited studies have demonstrated the effect of concentrate level on enteric CH4 emissions from grazing ...
• Effect of dietary nitrate on enteric methane emissions, production performance and rumen fermentation of dairy cows grazing kikuyu-dominant pasture during summer 

  Van Wyngaard, J.D.V. (Josef); Meeske, R.; Erasmus, L.J. (Lourens Jacobus) (Elsevier, 2018-10)

  Dietary nitrate supplementation is an effective methane (CH4) mitigation strategy in total mixed ration based diets fed to ruminants. To date, limited information is available on the effect of dietary nitrate on CH4 ...
• Technical note: A simple back-mounted harness for grazing dairy cows to facilitate the sulfur hexafluoride tracer gas technique 

  Van Wyngaard, J.D.V. (Josef); Meeske, R.; Erasmus, L.J. (Lourens Jacobus) (American Dairy Science Association, 2018-03)

  We describe here a cattle harness to attach a gas collection vessel to facilitate the sulfur hexafluoride (SF6) tracer gas technique. The harness consists of 2 major components: (1) a lightweight, robust body fabricated ...
• Genome-wide marker discovery in three South African indigenous cattle breeds (Afrikaner Drakensberger and Nguni) using next generation sequencing 

  Zwane, Avhashoni Agnes (University of Pretoria, 2018)

  Afrikaner, Drakensberger, and Nguni are the South African (SA) landraces that played major roles in the social, cultural and economic history of SA. These breeds are valuable genetic resources for beef production and limited ...
• Effects of enteric methane mitigating strategies on growth and carcass characteristics of lambs fed high forage diets 

  Van der Walt, Lené (University of Pretoria, 2018)

  This study formed part of a greater departmental research project on methane mitigation strategies in livestock, fed poor quality feeds or kept under extensive grazing conditions. Globally, livestock represents a large ...
• A comparison of physical characteristics of pine shavings biosecure pine shavings and sunflower hulls as litter material and its influence on broiler performance 

  Smalberger, Mareli (University of Pretoria, 2018)

  This study was conducted to investigate three different litter materials, namely pine shavings (PS), bio-secure, fumigated pine shavings (BS) and sunflower hulls (SH) on their physical characteristics and how this influenced ...
• Effect of condensed molasses solubles on intake growth performance digestibility and certain rumen parameters of sheep 

  O'Reilly, Keara (University of Pretoria, 2018)

  With a shortage of, and an increase in the price of conventional feedstuff for livestock, combined with the restrictions on the disposal of by-products from industrial plants, this has lead to by-product materials being ...
• Pro-active dairy herd udder health management decisions based on micro-biology and cytology of milk samples 

  Petzer, Inge-Marie (University of Pretoria, 2018)

  Please read abstract on the document
• Gene expression profiles in Longissimus dorsi muscle of Bonsmara and Nguni cattle fed two different diets 

  Linde, Dina Alida (University of Pretoria, 2018)

  In South Africa, Nguni cattle are one of the breeds found predominantly in extensive production systems. In this study the effect of two feedlot diets with different energy levels have been investigated using a transcriptome ...
• Qualitative intake and certain rumen parameters of beef cattle in north western parts of Namibia 

  England, Ashley Dawn (University of Pretoria, 2018)

  Beef production is known to be the most important livestock related activity in Namibia (Just over 2 million cattle in Namibia in 2009) with the majority of weaners being exported to the South African feedlot industry. ...
• Evaluation of production parameters of bulls of four beef breeds in the Vrede district of South Africa 

  Groenewald, Abraham Petrus (University of Pretoria, 2018)

  objective of the study is to investigate the economic important performance traits of beef cattle bulls in a production environment. Performance data was collected, from 2001 to 2012 on 1318 bulls comprising of four breeds ...
• A whole farm model for quantifying total greenhouse gas emissions on South African dairy farms 

  Reinecke, Riana; Casey, N.H. (Norman Henry) (South African Society for Animal Science, 2017-10-13)

  This paper presents a model to quantify total greenhouse gas (GHG) emissions from dairy farms. The model, which is based on a whole farm management approach, accounts for the variability that occurs in GHG emissions among ...
• Effects of short and extended fasting periods and cattle breed on glycogenolysis, sarcomere shortening and Warner-Bratzler shear force 

  O’Neill, H.A.; Webb, E.C. (Edward Cottington); Frylinck, L.; Strydom, P.E. (South African Society for Animal Science, 2018)

  The effects of short (three hours) and extended (24 hours) feed withdrawal periods and three cattle breeds on muscle energy metabolism, sarcomere length, and meat quality were investigated. Brahman (Br), Nguni (Ng), and ...
• The use of certain medicinal plant extracts reduced in vitro methane production while improving in vitro organic matter digestibility 

  Akanmu, Abiodun M.; Hassen, Abubeker (CSIRO, 2018)

  Some medicinal plants have the tendency to manipulate the rumen microbial ecosystem, which in turn might reduce methane (CH4) emissions. The anti-methanogenic activities of leaf fraction of Piper betle, Aloe vera, Carica ...
• Comparative performance of dairy cows in low-input smallholder and high-input production systems in South Africa 

  Abin, Samuel; Visser, Carina; Banga, C.B. (Springer, 2018-03)

  The aim of this study was to benchmark the performance of dairy cows in the low-input smallholder system against their counterparts in the high-input system, in South Africa. Data comprised of cow performance records from ...

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