Welwitschia International Journal of Agricultural Sciences https://journals.unam.edu.na/index.php/WIJAS <p>Welwitschia International Journal of Agricultural Sciences (WIJAS) publishes original and review papers, surveys, experiments, case studies, technical reports, viewpoints, book reviews, notes, commentaries and news in various agriculture and natural resources disciplines. Journal maintains high-quality publication of manuscripts that meet the general criteria of scientific excellence.</p> University of Namibia en-US Welwitschia International Journal of Agricultural Sciences 2026-8750 <p>The Welwitschia International Journal of Agricultural Sciences (WIJAS) is published under a Creative Commons Attribution 4.0 (CC BY 4.0) license. The license allows users to distribute, remix, adapt, and build upon the material in any medium or format, provided that attribution is given to the creator. The license also allows for commercial use. The WIJAS has migrated from a CC BY-NC 4.0 license to a CC BY 4.0 license to allow for further sharing and re-use of knowledge with no restrictions.</p> Characterization of the nutritional values of agro-industrial by-products in Namibia as potential supplements of the bush-based feeds https://journals.unam.edu.na/index.php/WIJAS/article/view/1572 <p>The objective of this study was to characterize the nutritional values of Namibian agro-industrial by-products (AIBPs) as potential supplements for bush-based feeds. Fourteen AIBPs’ samples were collected from Namibian local cereals and oilseed processing companies. Cereal by-products were malt dust fine (MDF), pearl millet bran (PMB), malt dust coarse(MDC), white maize chop (WMC), wheat bran(WB), brewer’s spent grains(BSG), sorghum brew residue (SBR) and sorghum spent grains (SSG), while oilseed byproducts were olive oil cake(OIC), marula oil press (MOP), jojoba oil cake (JOC), !nara oil cake(NAC), manketti oil cake (KOC) and marula oil cake (MOC). Chemical compositions, <em>in vitro </em>gas production, <em>in vitro</em> organic matter digestibility, and metabolizable energy of the AIBPs were determined in a randomized complete block design and the data were statistically analyzed using a Statistical Package for Social Science. Crude protein, ether extract, neutral detergent fiber, and acid detergent fiber ranged from 7.90 (SSG)-21.95 %( BSG), 1.37(MDF)-9.29%(PMB), 22.23(WMC)-73.06%(BSG), 7.22 (PMB) -30.46% (BSG) respectively for cereal by-products and 7.55(OIC)-37.3% (MOP), 8.11(KOC)-53.55%(MOC), 11.40 (MOC)-58.26%(KOC) and 8.21(MOP)-52.26%(MOP) in oil seeds by-products respectively. The <em>in vitro</em> gas production, <em>in vitro</em> organic matter digestibility, and metabolizable energy ranges for cereal and oilseed by-products were 31.50 (BSG)-70.20ml/200mgDM(WMC), 55.55 (BSG)-83.50%DM(WMC), 9.30(BSG)-14.00MJ/Kg(white maize chop), and 3.80 (MOP)-35.30ml/200mgDM(jojoba oil cake), 38.95(MOP)-59.35%(JOC), and 7.45(MOC)-15.95MJ/Kg(MOP), respectively. The AIBPs investigated in this study comprised of minimal fiber contents, adequate crude protein, and metabolizable energy contents above minimum requirements for ruminant animals.&nbsp; However, promotion to maximally utilize these AIBPs in animal diets requires further evaluation.</p> Magdalena Kamati Johnfisher Mupangwa Maria N. T Shipandeni Copyright (c) 2022 Magdalena Kamati, Johnfisher Mupangwa, Maria N. T Shipandeni https://creativecommons.org/licenses/by-nc-nd/4.0 2022-09-11 2022-09-11 3 11 22 The effect of arboricide application on soil chemical properties at Neudamm farm, Namibia https://journals.unam.edu.na/index.php/WIJAS/article/view/1429 <p><strong>Abstract</strong></p> <p>This study assessed the effects of chemical treatments on soil chemical properties at Neudamm farm. A total of 6 composite soil samples were randomly collected from all three 250 m<sup>2</sup> belt transects in each of the three chemically treated and control sites at a depth of 15 cm using a soil auger. The soil was analysed for pH, organic matter, organic carbon and soil minerals. A GLM procedure of SAS was used for analyses. The soil pH was significantly (<em>P</em> &lt; 0.05) higher in the chemically treated site of 2015 (6.06), followed by the control (5.61) and the chemically treated site of 2017 (5.5). The OC and OM percentages were greater (<em>P</em> &lt; 0.05) in the chemically treated site of 2015 than in all three sites. The chemically treated site of 2016 had the highest soil Ca (551 ppm), K (197.3 ppm), Mg (76 ppm), P (23.3) contents, followed by the site of 2015, than the control site. The study concluded that chemically treated sites had improved soil fertility through controlled bush density. The study recommends that arboricides should be applied as aftercare and for long term monitoring be carried out routinely to acquire systematic trends of the soil chemical properties.</p> <p>&nbsp;</p> Absalom Kahumba Diina N. Shigwedha Rosemary N. Shikangalah Copyright (c) 2022 Absalom Kahumba, Diina N. Shigwedha, Rosemary N. Shikangalah https://creativecommons.org/licenses/by-nc-nd/4.0 2022-09-09 2022-09-09 3 1 10 Modelling supply response and volatility of Swakara pelts in Namibia https://journals.unam.edu.na/index.php/WIJAS/article/view/1606 <p>The karakul industry has been experiencing a continuous decline in the number of pelts supplied since the late 1970s. This decline is speculated to be a result of the anti-fur movement. Coincidently, throughout the years, the price of Karakul pelts is seen to increase. This abnormal mismatch in supply and demand has challenged economic theory which explains that price increases should increase supply. This paper uses time-series data from 1960 to 2019 to model supply response and volatility in the karakul industry. The dataset was tested for unit root and an autoregressive distributed lag model was run to examine the extent to which the local production of Swakara pelts responds to the supply determinants. Pelt supply lagged one year, cost of production, average pelt producer price, average mutton producer price yield, and the exchange rate has significant implications on the current pelt supply. The influence of the anti-fur movement, however, equally has a significant relationship. The results indicated high volatility between all variables with social awareness being the outlier. The global anti-fur movement has played a large role, that Namibian farmers reduced their Karakul stock.&nbsp; Since 2012, nationally but also globally, prices of all pelt and fur are on a continuous decline which points to a “dying” industry. The survival of the Namibian pelt industry requires further research on the global demand, adjustments of some legislation, and supported production incentives for farmer welfare.</p> <p><strong>&nbsp;</strong></p> Leigh-Ann T Nehoya Kennedy Kalundu Helmke Jens Sartorius von Bach Copyright (c) 2022 Leigh-Ann T Lehoya, Kennedy Kalundu, Helmke Jens Sartorius von Bach https://creativecommons.org/licenses/by-nc-nd/4.0 2022-10-03 2022-10-03 3 50 63 Effect of legume hay supplementation on feed intake, growth, digestibility and volatile fatty acid production of Xhosa goats https://journals.unam.edu.na/index.php/WIJAS/article/view/1459 <p><strong>Abstract&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </strong></p> <p>The objective of this study was to evaluate the effects of sex and supplementing <em>Chloris gayana</em> hay with either <em>Lablab purpureus </em>or<em> Vigna unguiculata</em> on growth, volatile fatty acid (VFA) production and apparent nutrient digestibility. Eighteen goats, one-year-old, of average live weight 14.13 ±0.24kg was apportioned in a completely randomized design to three diets which were iso-nitrogenous and iso-energetic. Animals were housed individually with 6 animals per treatment composed of three males and three females. Total DM intake was higher (<em>P </em>&lt; 0.05) in T<sub>2</sub> (694.8 g/head/day) and T<sub>3</sub> (688.1 g/head/day) compared to T<sub>1</sub> (607.8 g/head day). The goats gained at a rate of 35.0g/d; 45.0g/d and 38.3g/d for T<sub>1</sub>, T<sub>2</sub>, and T<sub>3, </sub>respectively. Goats on T<sub>2</sub> showed a non-significantly higher (<em>P</em> &gt; 0.05) growth rate exhibiting total gain of 2.68kg compared to 2.08kg and 2.33kg for T<sub>1 </sub>and T<sub>3, </sub>respectively<sub>. </sub>Animals on T<sub>1</sub> (19.16) exhibited a significantly lower FCR (<em>P</em> &lt; 0.05) than T<sub>2</sub> (15.44) and T<sub>3</sub> (18.11). Apparent DM digestibility were significantly different (<em>P</em> &lt; 0<em>.</em>05) among treatment diets.&nbsp; Sex significantly influenced DM, ADF and NDF digestibilities (<em>P</em> &lt; 0.05). There were no significant (<em>P</em> &gt; 0.05) differences in individual VFA molar concentrations among treatment diets and due to sex for acetate, propionate, valerate, iso-butyrate and iso-valerate. However, diets significantly influenced butyrate concentration (<em>P</em> &lt; 0.05) with 0.25, 0.95 and 0.25mM for T<sub>1</sub>, T<sub>2</sub> and T<sub>3,</sub> respectively. The percentage molar concentration for acetate was 75%, 73%, and 77% while the propionate concentration was 12%, 8% and 10.7 % for T<sub>1</sub>, T<sub>2</sub>, and T<sub>3,</sub> respectively. The acetate to propionate ratio was 6.2, 9.12 and 7.15 for T<sub>1</sub>, T<sub>2</sub>, and T<sub>3,</sub> respectively. In conclusion, the study demonstrated that Cowpea and Lablab forages can support growth in goats at the same level of CP as in commercial pellets.&nbsp;</p> John Mupangwa Soul Washaya Voster Muchenje Copyright (c) 2021 John Mupangwa, Soul Washaya https://creativecommons.org/licenses/by-nc-nd/4.0 2022-09-13 2022-09-13 3 37 49 10.32642/wijas.v3i.1459 Public Spending as a Predictor of Livestock Total Factor Productivity in Namibia https://journals.unam.edu.na/index.php/WIJAS/article/view/1607 <p>This paper investigates public spending and its catalytic role towards a productive agricultural sector. This was done empirically by testing how agricultural total factor productivity could be increased. Data used is for the period 1991 to 2021. A Tornqvist-Theil Index was developed. A simultaneous equation became the chosen and implementable analytical tool for this study. While an agricultural total factor productivity index for Namibia did not exist before, the livestock component was generated for the first time in this study to fill this gap. Stunning is the fact that the Malabo declaration in terms of its convergence target of 10% is not yet met. The results show that by increasing productive labour to the livestock subsector by 10%, real gross domestic product will increase by 12%. Likewise, should capital formation and spending towards agriculture be increased to 10%, the growth of the agricultural sector will increase by 8.5%. This would require input-base needs to be expanded for output to increase. The work done by the Namibian Government so far yearn for further efforts to create more jobs, increase food production, and foreign income earning, remains to be addressed. To achieve all these, compliance with the Malabo declaration would be necessary.</p> <p> </p> Helmke Jens Sartorius von Bach Jacob Nyambe Copyright (c) 2022 Helmke Jens Sartorius von Bach, Jacob Nyambe https://creativecommons.org/licenses/by-nc-nd/4.0 2022-09-11 2022-09-11 3 23 36