Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Time series livestock diet optimization : cost-effective broiler feed substitution using the commodity price spread approach
Alqaisi, Othman ; Ndambi, Oghaiki Asaah ; Williams, Ryan Blake - \ 2017
Agricultural and food economics 5 (2017)1. - ISSN 2193-7532
Broiler diet - Byproducts - Feed industry - Multi-stage linear-programming - Price spread - Trading
Sustainable feed formulation (defined here as nutritional and economic feed optimization) is substantial in feed chain production from crop farmers to livestock producers. Diet formulation employing a static linear programming (LP) approach, which is widely used in trading firms and feed production facilities, does not allow for intertemporal flexibility. Our approach allows the interaction between feed components over time, considering the volatile global feed prices, thereby improving sustainability in feed formulation and feed availability. The objectives of this study were to (1) develop a multi-stage LP feed model, (2) demonstrate its potential use in broiler feeding, and (3) illustrate the impact of feed input price spread (variation) on the composition of broiler diets. Modeling resulted in reciprocal relationships between conventional feeds and byproducts at different rates. Based on the price spreads expressed as a percentage of DDGS (distiller’s dried grains with solubles) price compared to corn price, three positions of dietary switch were identified; corn-DDGS price spreads of higher than 94%, between 76 and 94%, and lower than 76% corresponding to limited/no inclusion, partial inclusion, and maximum replacement of corn by DDGS, respectively. Rapeseed meal inclusion was 4, 5, and 6% in the corn-based starter, grower, and finisher diets, respectively, and its potential to replace soybean meal was limited by its higher fiber content. Based on the simulated compound feed prices, the global broiler feed industry could gain 1.7 billion USD through improved resources planning.
A preliminary amplified fragment length polymorphism (AFLP) primers selection for spathoglottis species
Ginibun, F.C. ; Bhassu, S. ; Khalid, N. ; Arens, P. ; Vosman, B. ; Othman, R.Y. - \ 2015
Acta Horticulturae 1078 (2015). - ISSN 0567-7572 - p. 167 - 173.
AFLP primer - Molecular marker - Terrestrial orchid

Spathoglottis is a native terrestrial orchid that attracting horticultural interest as a landscaping plant. Distinguishing orchid at species level based on morphological characteristics is unconvincing as some characteristic may sensitive to environmental. Therefore, molecular characterization could be an alternative method in characterizing Spathoglottis species. Amplified Fragment Length Polymorphism (AFLP) marker was selected to characterize the Spathoglottis species. Among 56 AFLP primer combinations tested on Spathoglottis plicata, only eight primer combinations gave clear scorable polymorphic bands. A total of 60 accessions of Spathoglottis species, hybrid and outgroup (Dendrobium) were analysed using the eight primer combinations and generated 891 polymorphic bands with 98.41% in average. The AFLP patterns showed that the Spathoglottis species sampled were clearly different.

Allantoin and amino acid composition in xylem exudates of nodulated and nitrate dependent cowpea plants.
Wan Othman, W.M. ; Lie, T.A. ; Mannetje, L. 't - \ 1993
Pertanika journal of tropical agricultural science 16 (1993)1. - p. 53 - 63.
Low level phosphorus supply affecting nodulation, N2 fixation and growth of cowpea (Vigna anguiculata L. Walp).
Wan Othman, W.M. ; Lie, T.A. ; Mannetje, L. 't; Wassink, G.Y. - \ 1991
Plant and Soil 135 (1991). - ISSN 0032-079X - p. 67 - 74.
Physiological aspects of biological nitrogen fixation: Actual and potential nitrogen fixation.
Mil, M. van; Lie, T.A. - \ 1988
In: Proc. UNESCO Symp. Biotechnology of nitrogen fixation in the tropics, Z.H. Shamsuddin, W.M.W. Othman, M. Marzia, J. Sundram (eds.). Univ. Pertanian Malaysia, Kuala Lumpur - p. 171 - 176.
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