title: Defining a breeding objective for Nile tilapia that takes into account the diversity of smallholder production systems.
abstract: In general, livestock and fish farming systems in developing countries tend to be highly diverse in terms of agro-ecological conditions and market orientation. There are no studies that have investigated if and how this diversity translates to varying preferences for breeding objective traits. This is particularly important for breeding programmes that are organized on a national level (e.g. government-supported nucleus breeding programmes). The aim of this study was to investigate whether Nile tilapia farmers with diverse production systems and economic constraints have different preferences for breeding objective traits. The second objective was to derive a consensus breeding goal, using weighted goal programming that could be used for a national breeding programme for Nile tilapia. A survey was conducted among 100 smallholder Nile tilapia farmers in Kenya to obtain preference values for traits of economic importance, by using multiple pairwise comparisons. Individual and group preference values were estimated using analytical hierarchy process. Low-income farmers preferred harvest weight, while medium- and high-income farmers preferred growth rate and survival. Grouping farmers according to market objective (fingerling production or fattening) showed that fingerling producers preferred growth rate and survival, while fattening farmers preferred harvest weight, height and thickness. Weighted goal programming was used to obtain consensus preference values, and these were used to derive desired gains for a breeding goal of a national breeding programme that takes into account the diversity of smallholder production systems.
authors.affiliation: Animal Breeding and Genomics Centre, Wageningen University, Wageningen, the Netherlands.|Animal Breeding and Genomics Group, Department of Animal Sciences, Egerton University, Egerton, Kenya.
authors.forename: S K
authors.initials: SK
authors.lastname: Omasaki
authors.affiliation: Animal Breeding and Genomics Centre, Wageningen University, Wageningen, the Netherlands.
authors.forename: J A M
authors.initials: JA
authors.lastname: van Arendonk
authors.affiliation: Animal Breeding and Genomics Group, Department of Animal Sciences, Egerton University, Egerton, Kenya.
authors.forename: A K
authors.initials: AK
authors.lastname: Kahi
authors.affiliation: Animal Breeding and Genomics Centre, Wageningen University, Wageningen, the Netherlands. hans.komen@wur.nl.
authors.forename: H
authors.initials: H
authors.lastname: Komen
mesh_terms: D000818:Animals; D017756:Aquaculture / Q000191:economics; D001947:Breeding; D005260:Female; D008297:Male; D017210:Tilapia / Q000235:genetics* / Q000254:growth & development / Q000502:physiology
keywords: Breeding goal; Nile tilapia; desired genetic gain; participatory approach; smallholder production